TY  - JOUR
AU  - Hernández-Ceballos, M. A.
AU  - Brattich, Erika
AU  - Ajtić, Jelena
PY  - 2022
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2466
AB  - The long-term monitoring of the cosmogenic 7Be activity concentrations has been used to better understand the influence of large-scale atmospheric circulation dynamics in the troposphere. With an aim, this study analyzes weekly 7Be data from 15 sampling stations in Europe over 2005–2014. We first define peak (or extremely high) events in each station as those activity concentrations above the 90th percentile, and then investigate their temporal and spatial variability. These events are most frequent in the spring and summer seasons, with a notable latitudinal variability in their number. Next, we use back-trajectory cluster analysis to identify the main advection pathways associated with these high concentrations. To achieve this, persistent periods, i.e., sampling periods over which at least 60% of the calculated backward trajectories arriving at a given site correspond to the same airflow pattern, are taken as reference. This method reveals large differences in the association between the airflow patterns observed at different stations in connection with the 7Be peaks. A comparison between stations shows no clear spatial pattern, which suggests a further influence of mesoscale/local physical processes on the surface 7Be activity concentrations. Finally, the main airflow pattern at each sampling site and the associated 7Be peaks, are related to the main teleconnection patterns of large scale and regional climate variability in Europe: North Atlantic Oscillation, Arctic Oscillation, East Atlantic, East Atlantic/Western Russia, Scandinavian pattern and Western Mediterranean Oscillation. The results point out the connection between the negative phases of NAO and We-MO, and the positive phase of EA with the spatial and temporal variability and occurrence of the 7Be peak activity concentrations. These results show a latitudinal division between northern and southern sites, with similar influence of teleconnection patterns, while those located in the central part of Europe present larger variability in the impact of teleconnection patterns.
PB  - Elsevier
T2  - Chemosphere
T1  - Airflow and teleconnection patterns driving the spatial and temporal variability of high 7Be air concentrations in Europe
VL  - 303
SP  - 135194
DO  - 10.1016/j.chemosphere.2022.135194
ER  - 

@article{
author = "Hernández-Ceballos, M. A. and Brattich, Erika and Ajtić, Jelena",
year = "2022",
abstract = "The long-term monitoring of the cosmogenic 7Be activity concentrations has been used to better understand the influence of large-scale atmospheric circulation dynamics in the troposphere. With an aim, this study analyzes weekly 7Be data from 15 sampling stations in Europe over 2005–2014. We first define peak (or extremely high) events in each station as those activity concentrations above the 90th percentile, and then investigate their temporal and spatial variability. These events are most frequent in the spring and summer seasons, with a notable latitudinal variability in their number. Next, we use back-trajectory cluster analysis to identify the main advection pathways associated with these high concentrations. To achieve this, persistent periods, i.e., sampling periods over which at least 60% of the calculated backward trajectories arriving at a given site correspond to the same airflow pattern, are taken as reference. This method reveals large differences in the association between the airflow patterns observed at different stations in connection with the 7Be peaks. A comparison between stations shows no clear spatial pattern, which suggests a further influence of mesoscale/local physical processes on the surface 7Be activity concentrations. Finally, the main airflow pattern at each sampling site and the associated 7Be peaks, are related to the main teleconnection patterns of large scale and regional climate variability in Europe: North Atlantic Oscillation, Arctic Oscillation, East Atlantic, East Atlantic/Western Russia, Scandinavian pattern and Western Mediterranean Oscillation. The results point out the connection between the negative phases of NAO and We-MO, and the positive phase of EA with the spatial and temporal variability and occurrence of the 7Be peak activity concentrations. These results show a latitudinal division between northern and southern sites, with similar influence of teleconnection patterns, while those located in the central part of Europe present larger variability in the impact of teleconnection patterns.",
publisher = "Elsevier",
journal = "Chemosphere",
title = "Airflow and teleconnection patterns driving the spatial and temporal variability of high 7Be air concentrations in Europe",
volume = "303",
pages = "135194",
doi = "10.1016/j.chemosphere.2022.135194"
}

Hernández-Ceballos, M. A., Brattich, E.,& Ajtić, J.. (2022). Airflow and teleconnection patterns driving the spatial and temporal variability of high 7Be air concentrations in Europe. in Chemosphere
Elsevier., 303, 135194.
https://doi.org/10.1016/j.chemosphere.2022.135194

Hernández-Ceballos MA, Brattich E, Ajtić J. Airflow and teleconnection patterns driving the spatial and temporal variability of high 7Be air concentrations in Europe. in Chemosphere. 2022;303:135194.
doi:10.1016/j.chemosphere.2022.135194 .

Hernández-Ceballos, M. A., Brattich, Erika, Ajtić, Jelena, "Airflow and teleconnection patterns driving the spatial and temporal variability of high 7Be air concentrations in Europe" in Chemosphere, 303 (2022):135194,
https://doi.org/10.1016/j.chemosphere.2022.135194 . .

TY  - JOUR
AU  - Brattich, Erika
AU  - Liu, Hongyu
AU  - Zhang, Bo
AU  - Hernández-Ceballos, Miguel Ángel
AU  - Paatero, Jussi
AU  - Sarvan, Darko
AU  - Djurdjević, Vladimir
AU  - Tositti, Laura
AU  - Ajtić, Jelena
PY  - 2021
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2336
AB  - Abstract. Events of very high concentrations of 7Be cosmogenic radionuclide have been recorded at low-elevation surface stations in the subpolar regions of Europe during the cold season. With an aim to investigate the mechanisms responsible for those peak 7Be events, and in particular to verify if they are associated with the fast descent of stratospheric air masses occurring during sudden stratospheric warming (SSW) events, we analyze 7Be observations at six sampling sites in Fennoscandia during January–March 2003 when very high 7Be concentrations were observed and the Arctic vortex was relatively unstable as a consequence of several SSW events. We use the GEOS-Chem chemistry and transport model driven by the MERRA-2 meteorological reanalysis to simulate tropospheric 7Be over northern Europe. We show that the model reasonably reproduces the temporal evolution of surface 7Be concentrations observed at the six sampling sites. Our analysis of model simulations, surface 7Be observations, atmospheric soundings of ozone and temperature and surface ozone measurements indicates that the 7Be peak observed in late February 2003 (between 20 and 28 February 2003) at the six sampling sites in Fennoscandia was associated with downward transport of stratospheric vortex air that originated during an SSW that occurred a few days earlier (between 18 and 21 February 2003).
T2  - Atmospheric Chemistry and Physics
T1  - Observation and modeling of high-7Be concentration events at the surface in northern Europe associated with the instability of the Arctic polar vortex in early 2003
VL  - 21
IS  - 23
SP  - 17927
EP  - 17951
DO  - 10.5194/acp-21-17927-2021
ER  - 

@article{
author = "Brattich, Erika and Liu, Hongyu and Zhang, Bo and Hernández-Ceballos, Miguel Ángel and Paatero, Jussi and Sarvan, Darko and Djurdjević, Vladimir and Tositti, Laura and Ajtić, Jelena",
year = "2021",
abstract = "Abstract. Events of very high concentrations of 7Be cosmogenic radionuclide have been recorded at low-elevation surface stations in the subpolar regions of Europe during the cold season. With an aim to investigate the mechanisms responsible for those peak 7Be events, and in particular to verify if they are associated with the fast descent of stratospheric air masses occurring during sudden stratospheric warming (SSW) events, we analyze 7Be observations at six sampling sites in Fennoscandia during January–March 2003 when very high 7Be concentrations were observed and the Arctic vortex was relatively unstable as a consequence of several SSW events. We use the GEOS-Chem chemistry and transport model driven by the MERRA-2 meteorological reanalysis to simulate tropospheric 7Be over northern Europe. We show that the model reasonably reproduces the temporal evolution of surface 7Be concentrations observed at the six sampling sites. Our analysis of model simulations, surface 7Be observations, atmospheric soundings of ozone and temperature and surface ozone measurements indicates that the 7Be peak observed in late February 2003 (between 20 and 28 February 2003) at the six sampling sites in Fennoscandia was associated with downward transport of stratospheric vortex air that originated during an SSW that occurred a few days earlier (between 18 and 21 February 2003).",
journal = "Atmospheric Chemistry and Physics",
title = "Observation and modeling of high-7Be concentration events at the surface in northern Europe associated with the instability of the Arctic polar vortex in early 2003",
volume = "21",
number = "23",
pages = "17927-17951",
doi = "10.5194/acp-21-17927-2021"
}

Brattich, E., Liu, H., Zhang, B., Hernández-Ceballos, M. Á., Paatero, J., Sarvan, D., Djurdjević, V., Tositti, L.,& Ajtić, J.. (2021). Observation and modeling of high-7Be concentration events at the surface in northern Europe associated with the instability of the Arctic polar vortex in early 2003. in Atmospheric Chemistry and Physics, 21(23), 17927-17951.
https://doi.org/10.5194/acp-21-17927-2021

Brattich E, Liu H, Zhang B, Hernández-Ceballos MÁ, Paatero J, Sarvan D, Djurdjević V, Tositti L, Ajtić J. Observation and modeling of high-7Be concentration events at the surface in northern Europe associated with the instability of the Arctic polar vortex in early 2003. in Atmospheric Chemistry and Physics. 2021;21(23):17927-17951.
doi:10.5194/acp-21-17927-2021 .

Brattich, Erika, Liu, Hongyu, Zhang, Bo, Hernández-Ceballos, Miguel Ángel, Paatero, Jussi, Sarvan, Darko, Djurdjević, Vladimir, Tositti, Laura, Ajtić, Jelena, "Observation and modeling of high-7Be concentration events at the surface in northern Europe associated with the instability of the Arctic polar vortex in early 2003" in Atmospheric Chemistry and Physics, 21, no. 23 (2021):17927-17951,
https://doi.org/10.5194/acp-21-17927-2021 . .

TY  - DATA
AU  - Brattich, Erika
AU  - Liu, Hongyu
AU  - Zhang, Bo
AU  - Hernández-Ceballos, Miguel Ángel
AU  - Paatero, Jussi
AU  - Sarvan, Darko
AU  - Djurdjević, Vladimir
AU  - Tositti, Laura
AU  - Ajtić, Jelena
PY  - 2021
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2337
T2  - Atmospheric Chemistry and Physics
T1  - Supplementary data for article:  Brattich, E.; Liu, H.; Zhang, B.; Hernández-Ceballos, M. Á.; Paatero, J.; Sarvan, D.; Djurdjevic, V.; Tositti, L.; Ajtić, J. Observation and Modeling of High-7Be Concentration Events at the Surface in Northern Europe Associated with the Instability of the Arctic Polar Vortex in Early 2003. Atmospheric Chemistry and Physics 2021, 21 (23), 17927–17951. https://doi.org/10.5194/acp-21-17927-2021
VL  - 21
IS  - 23
SP  - 17927
EP  - 17951
DO  - 10.5194/acp-21-17927-2021-supplement
ER  - 

@misc{
author = "Brattich, Erika and Liu, Hongyu and Zhang, Bo and Hernández-Ceballos, Miguel Ángel and Paatero, Jussi and Sarvan, Darko and Djurdjević, Vladimir and Tositti, Laura and Ajtić, Jelena",
year = "2021",
journal = "Atmospheric Chemistry and Physics",
title = "Supplementary data for article:  Brattich, E.; Liu, H.; Zhang, B.; Hernández-Ceballos, M. Á.; Paatero, J.; Sarvan, D.; Djurdjevic, V.; Tositti, L.; Ajtić, J. Observation and Modeling of High-7Be Concentration Events at the Surface in Northern Europe Associated with the Instability of the Arctic Polar Vortex in Early 2003. Atmospheric Chemistry and Physics 2021, 21 (23), 17927–17951. https://doi.org/10.5194/acp-21-17927-2021",
volume = "21",
number = "23",
pages = "17927-17951",
doi = "10.5194/acp-21-17927-2021-supplement"
}

Brattich, E., Liu, H., Zhang, B., Hernández-Ceballos, M. Á., Paatero, J., Sarvan, D., Djurdjević, V., Tositti, L.,& Ajtić, J.. (2021). Supplementary data for article:  Brattich, E.; Liu, H.; Zhang, B.; Hernández-Ceballos, M. Á.; Paatero, J.; Sarvan, D.; Djurdjevic, V.; Tositti, L.; Ajtić, J. Observation and Modeling of High-7Be Concentration Events at the Surface in Northern Europe Associated with the Instability of the Arctic Polar Vortex in Early 2003. Atmospheric Chemistry and Physics 2021, 21 (23), 17927–17951. https://doi.org/10.5194/acp-21-17927-2021. in Atmospheric Chemistry and Physics, 21(23), 17927-17951.
https://doi.org/10.5194/acp-21-17927-2021-supplement

Brattich E, Liu H, Zhang B, Hernández-Ceballos MÁ, Paatero J, Sarvan D, Djurdjević V, Tositti L, Ajtić J. Supplementary data for article:  Brattich, E.; Liu, H.; Zhang, B.; Hernández-Ceballos, M. Á.; Paatero, J.; Sarvan, D.; Djurdjevic, V.; Tositti, L.; Ajtić, J. Observation and Modeling of High-7Be Concentration Events at the Surface in Northern Europe Associated with the Instability of the Arctic Polar Vortex in Early 2003. Atmospheric Chemistry and Physics 2021, 21 (23), 17927–17951. https://doi.org/10.5194/acp-21-17927-2021. in Atmospheric Chemistry and Physics. 2021;21(23):17927-17951.
doi:10.5194/acp-21-17927-2021-supplement .

Brattich, Erika, Liu, Hongyu, Zhang, Bo, Hernández-Ceballos, Miguel Ángel, Paatero, Jussi, Sarvan, Darko, Djurdjević, Vladimir, Tositti, Laura, Ajtić, Jelena, "Supplementary data for article:  Brattich, E.; Liu, H.; Zhang, B.; Hernández-Ceballos, M. Á.; Paatero, J.; Sarvan, D.; Djurdjevic, V.; Tositti, L.; Ajtić, J. Observation and Modeling of High-7Be Concentration Events at the Surface in Northern Europe Associated with the Instability of the Arctic Polar Vortex in Early 2003. Atmospheric Chemistry and Physics 2021, 21 (23), 17927–17951. https://doi.org/10.5194/acp-21-17927-2021" in Atmospheric Chemistry and Physics, 21, no. 23 (2021):17927-17951,
https://doi.org/10.5194/acp-21-17927-2021-supplement . .

TY  - CONF
AU  - Stratimirović, Djordje
AU  - Sarvan, Darko
AU  - Brattich, Erika
AU  - Hernández-Ceballos, Miguel Angel
AU  - Djurdjević, Vladimir
AU  - Ajtić, Jelena
PY  - 2021
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2371
AB  - U ovom radu razmatramo vremenske serije srednjih nedeljnih specifičnih aktivnosti
berilijuma-7 u vazduhu i temperature na lokaciji Beč (48,22 ºN; 16,35 ºE; 193 m n.v.) u
Austriji, koje su zabeležene od februara 1987. do decembra 2014. godine. Merenja
specifične aktivnosti berilijuma-7 u prizmenom sloju vazduha preuzeta su iz
Radioactivity Environmental Monitoring databank (REMdb) koju održava Objedinjeni
istraživački centar u Ispri, Italija, a podaci za lokalnu temperaturu iz E-OBS gridovane
klimatologije (verzija 15) koji su potom bilinearnom interpolacijom ekstrahovani na
lokaciju uzorkovanja berilijuma-7. Za analizu serija koristili smo korelacionu analizu i
vejvlet transformacije. Vrednost Pirsonovog koeficijenta korelacije od 0,68 ukazuje na
jaku vezu između nedeljnih specifičnih aktivnosti berilijuma-7 i temperature, dok vejvlet
spektri snage pokazuju izraziti godišnji period za obe varijable tokom ispitivanog
vremenskog intervala. Godišnji period dominantno je vidljiv i na kros-korelacionom
spektru. Takođe je uočen blagi fazni pomeraj koji ukazuje da promena specifične
aktivnosti berilijuma-7 merene u prizemnom sloju vazduha prethodi promeni
temperature
PB  - Institut za nuklearne nauke „Vinča“
C3  - Zbornik radova sa XXXI Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 6–8. oktobar, 2021, Beograd, Srbija
T1  - Korelacione karakteristike specifične aktivnosti berilijuma-7 i temperature na dugogodišnjim nizovima nedeljnih vrednosti
SP  - 27
EP  - 31
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2371
ER  - 

@conference{
author = "Stratimirović, Djordje and Sarvan, Darko and Brattich, Erika and Hernández-Ceballos, Miguel Angel and Djurdjević, Vladimir and Ajtić, Jelena",
year = "2021",
abstract = "U ovom radu razmatramo vremenske serije srednjih nedeljnih specifičnih aktivnosti
berilijuma-7 u vazduhu i temperature na lokaciji Beč (48,22 ºN; 16,35 ºE; 193 m n.v.) u
Austriji, koje su zabeležene od februara 1987. do decembra 2014. godine. Merenja
specifične aktivnosti berilijuma-7 u prizmenom sloju vazduha preuzeta su iz
Radioactivity Environmental Monitoring databank (REMdb) koju održava Objedinjeni
istraživački centar u Ispri, Italija, a podaci za lokalnu temperaturu iz E-OBS gridovane
klimatologije (verzija 15) koji su potom bilinearnom interpolacijom ekstrahovani na
lokaciju uzorkovanja berilijuma-7. Za analizu serija koristili smo korelacionu analizu i
vejvlet transformacije. Vrednost Pirsonovog koeficijenta korelacije od 0,68 ukazuje na
jaku vezu između nedeljnih specifičnih aktivnosti berilijuma-7 i temperature, dok vejvlet
spektri snage pokazuju izraziti godišnji period za obe varijable tokom ispitivanog
vremenskog intervala. Godišnji period dominantno je vidljiv i na kros-korelacionom
spektru. Takođe je uočen blagi fazni pomeraj koji ukazuje da promena specifične
aktivnosti berilijuma-7 merene u prizemnom sloju vazduha prethodi promeni
temperature",
publisher = "Institut za nuklearne nauke „Vinča“",
journal = "Zbornik radova sa XXXI Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 6–8. oktobar, 2021, Beograd, Srbija",
title = "Korelacione karakteristike specifične aktivnosti berilijuma-7 i temperature na dugogodišnjim nizovima nedeljnih vrednosti",
pages = "27-31",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2371"
}

Stratimirović, D., Sarvan, D., Brattich, E., Hernández-Ceballos, M. A., Djurdjević, V.,& Ajtić, J.. (2021). Korelacione karakteristike specifične aktivnosti berilijuma-7 i temperature na dugogodišnjim nizovima nedeljnih vrednosti. in Zbornik radova sa XXXI Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 6–8. oktobar, 2021, Beograd, Srbija
Institut za nuklearne nauke „Vinča“., 27-31.
https://hdl.handle.net/21.15107/rcub_veterinar_2371

Stratimirović D, Sarvan D, Brattich E, Hernández-Ceballos MA, Djurdjević V, Ajtić J. Korelacione karakteristike specifične aktivnosti berilijuma-7 i temperature na dugogodišnjim nizovima nedeljnih vrednosti. in Zbornik radova sa XXXI Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 6–8. oktobar, 2021, Beograd, Srbija. 2021;:27-31.
https://hdl.handle.net/21.15107/rcub_veterinar_2371 .

Stratimirović, Djordje, Sarvan, Darko, Brattich, Erika, Hernández-Ceballos, Miguel Angel, Djurdjević, Vladimir, Ajtić, Jelena, "Korelacione karakteristike specifične aktivnosti berilijuma-7 i temperature na dugogodišnjim nizovima nedeljnih vrednosti" in Zbornik radova sa XXXI Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 6–8. oktobar, 2021, Beograd, Srbija (2021):27-31,
https://hdl.handle.net/21.15107/rcub_veterinar_2371 .

TY  - BOOK
AU  - Achatz, Michaela
AU  - Ajtić, Jelena
AU  - Ballabio, Cristiano
AU  - Barnet, Ivan
AU  - Bossew, Peter
AU  - Brattich, Erika
AU  - Briganti, Alessandra
AU  - Castelluccio, Mauro
AU  - Chiaberto, Enrico
AU  - Cinelli, Giorgia
AU  - Coletti, Chiara
AU  - Cucchi, Anselmo
AU  - Daraktchieva, Zornitza
AU  - De Cort, Marc
AU  - Domingos, Filipa
AU  - Dudar, Tamara
AU  - Elío, Javier
AU  - Falletti, Paolo
AU  - Ferreira, Antonio
AU  - Finne, Ingvild
AU  - Fuente Merino, Ismael
AU  - García-Talavera, Marta
AU  - Gruber, Valeria
AU  - Gutiérrez, Villanueva
AU  - Hernandez-Ceballos, Miguel A.
AU  - Hoffmann, Marcus
AU  - Iurlaro, Giorgia
AU  - Ivanova, Kremena
AU  - Jones, Arwyn
AU  - Kovalenko, Grygoriy
AU  - Kozak, Krzysztof
AU  - Lawley, Russell
AU  - Lehné, Rouwen
AU  - Lister, Bob
AU  - Lucchetti, Carlo
AU  - Magnoni, Mauro
AU  - Matolin, Milan
AU  - Mazur, Jadwiga
AU  - Mazzoli, Claudio
AU  - Mollo, Mara
AU  - Mostacci, Domiziano
AU  - Mundigl, Stefan
AU  - Nesbor, Dieter
AU  - Neves, Luis
AU  - Nikolov, Jovana
AU  - Nogarotto, Alessio
AU  - Onischenko, Aleksandra
AU  - Orgiazzi, Alberto
AU  - Pacherová, Petra
AU  - Panagos, Panos
AU  - Pokalyuk, Vladimir
AU  - Quindós, Poncela
AU  - Sassi, Raffaele
AU  - Soligo, Michele
AU  - Stoulos, Stylianos
AU  - Szabó, Katalin
AU  - Täht-Kok, Krista
AU  - Todorović, Nataša
AU  - Tollefsen, Tore
AU  - Tuccimei, Paola
AU  - Turtiainen, Tuukka
AU  - Tye, Andrew
AU  - Udovičić, Vladimir
AU  - Vasilyev, Aleksey
AU  - Verdelocco, Stefania
AU  - Verkhovtsev, Valentyn
AU  - Voltaggio, Mario
AU  - Zhukova, Olga
AU  - Zhukovsky, Michael
PY  - 2019
UR  - https://publications.jrc.ec.europa.eu/repository/handle/JRC116795
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2439
AB  - Natural ionizing radiation is considered as the largest contributor to the collective effective dose received by the world population. The human population is continuously exposed to ionizing radiation from several natural sources that can be classified into two broad categories: high-energy cosmic rays incident on the Earth’s atmosphere and releasing secondary radiation (cosmic contribution); and radioactive nuclides generated during the formation of the Earth and still present in the Earth’s crust (terrestrial contribution). Terrestrial radioactivity is mostly produced by the uranium and thorium radioactive families together with potassium. In most circumstances, radon, a noble gas produced in the radioactive decay of uranium, is the most important contributor to the total dose.This Atlas aims to present the current state of knowledge of natural radioactivity, by giving general background information, and describing its various sources. This reference material is complemented by a collection of maps of Europe displaying the levels of natural radioactivity caused by different sources. It is a compilation of contributions and reviews received from more than 80 experts in their field: they come from universities, research centres, national and European authorities and international organizations.This Atlas provides reference material and makes harmonized datasets available to the scientific community and national competent authorities. In parallel, this Atlas may serve as a tool for the public to: • familiarize itself with natural radioactivity;• be informed about the levels of natural radioactivity caused by different sources;• have a more balanced view of the annual dose received by the world population, to which natural radioactivity is the largest contributor;• and make direct comparisons between doses from natural sources of ionizing radiation and those from man-made (artificial) ones, hence to better understand the latter.Additional information at: https://remon.jrc.ec.europa.eu/About/Atlas-of-Natural-Radiation
PB  - Publications Office of the European Union
T1  - European Atlas of Natural Radiation
DO  - 10.2760/46388
DO  - 10.2760/520053
ER  - 

@book{
author = "Achatz, Michaela and Ajtić, Jelena and Ballabio, Cristiano and Barnet, Ivan and Bossew, Peter and Brattich, Erika and Briganti, Alessandra and Castelluccio, Mauro and Chiaberto, Enrico and Cinelli, Giorgia and Coletti, Chiara and Cucchi, Anselmo and Daraktchieva, Zornitza and De Cort, Marc and Domingos, Filipa and Dudar, Tamara and Elío, Javier and Falletti, Paolo and Ferreira, Antonio and Finne, Ingvild and Fuente Merino, Ismael and García-Talavera, Marta and Gruber, Valeria and Gutiérrez, Villanueva and Hernandez-Ceballos, Miguel A. and Hoffmann, Marcus and Iurlaro, Giorgia and Ivanova, Kremena and Jones, Arwyn and Kovalenko, Grygoriy and Kozak, Krzysztof and Lawley, Russell and Lehné, Rouwen and Lister, Bob and Lucchetti, Carlo and Magnoni, Mauro and Matolin, Milan and Mazur, Jadwiga and Mazzoli, Claudio and Mollo, Mara and Mostacci, Domiziano and Mundigl, Stefan and Nesbor, Dieter and Neves, Luis and Nikolov, Jovana and Nogarotto, Alessio and Onischenko, Aleksandra and Orgiazzi, Alberto and Pacherová, Petra and Panagos, Panos and Pokalyuk, Vladimir and Quindós, Poncela and Sassi, Raffaele and Soligo, Michele and Stoulos, Stylianos and Szabó, Katalin and Täht-Kok, Krista and Todorović, Nataša and Tollefsen, Tore and Tuccimei, Paola and Turtiainen, Tuukka and Tye, Andrew and Udovičić, Vladimir and Vasilyev, Aleksey and Verdelocco, Stefania and Verkhovtsev, Valentyn and Voltaggio, Mario and Zhukova, Olga and Zhukovsky, Michael",
year = "2019",
abstract = "Natural ionizing radiation is considered as the largest contributor to the collective effective dose received by the world population. The human population is continuously exposed to ionizing radiation from several natural sources that can be classified into two broad categories: high-energy cosmic rays incident on the Earth’s atmosphere and releasing secondary radiation (cosmic contribution); and radioactive nuclides generated during the formation of the Earth and still present in the Earth’s crust (terrestrial contribution). Terrestrial radioactivity is mostly produced by the uranium and thorium radioactive families together with potassium. In most circumstances, radon, a noble gas produced in the radioactive decay of uranium, is the most important contributor to the total dose.This Atlas aims to present the current state of knowledge of natural radioactivity, by giving general background information, and describing its various sources. This reference material is complemented by a collection of maps of Europe displaying the levels of natural radioactivity caused by different sources. It is a compilation of contributions and reviews received from more than 80 experts in their field: they come from universities, research centres, national and European authorities and international organizations.This Atlas provides reference material and makes harmonized datasets available to the scientific community and national competent authorities. In parallel, this Atlas may serve as a tool for the public to: • familiarize itself with natural radioactivity;• be informed about the levels of natural radioactivity caused by different sources;• have a more balanced view of the annual dose received by the world population, to which natural radioactivity is the largest contributor;• and make direct comparisons between doses from natural sources of ionizing radiation and those from man-made (artificial) ones, hence to better understand the latter.Additional information at: https://remon.jrc.ec.europa.eu/About/Atlas-of-Natural-Radiation",
publisher = "Publications Office of the European Union",
title = "European Atlas of Natural Radiation",
doi = "10.2760/46388, 10.2760/520053"
}

Achatz, M., Ajtić, J., Ballabio, C., Barnet, I., Bossew, P., Brattich, E., Briganti, A., Castelluccio, M., Chiaberto, E., Cinelli, G., Coletti, C., Cucchi, A., Daraktchieva, Z., De Cort, M., Domingos, F., Dudar, T., Elío, J., Falletti, P., Ferreira, A., Finne, I., Fuente Merino, I., García-Talavera, M., Gruber, V., Gutiérrez, V., Hernandez-Ceballos, M. A., Hoffmann, M., Iurlaro, G., Ivanova, K., Jones, A., Kovalenko, G., Kozak, K., Lawley, R., Lehné, R., Lister, B., Lucchetti, C., Magnoni, M., Matolin, M., Mazur, J., Mazzoli, C., Mollo, M., Mostacci, D., Mundigl, S., Nesbor, D., Neves, L., Nikolov, J., Nogarotto, A., Onischenko, A., Orgiazzi, A., Pacherová, P., Panagos, P., Pokalyuk, V., Quindós, P., Sassi, R., Soligo, M., Stoulos, S., Szabó, K., Täht-Kok, K., Todorović, N., Tollefsen, T., Tuccimei, P., Turtiainen, T., Tye, A., Udovičić, V., Vasilyev, A., Verdelocco, S., Verkhovtsev, V., Voltaggio, M., Zhukova, O.,& Zhukovsky, M.. (2019). European Atlas of Natural Radiation. 
Publications Office of the European Union..
https://doi.org/10.2760/46388

Achatz M, Ajtić J, Ballabio C, Barnet I, Bossew P, Brattich E, Briganti A, Castelluccio M, Chiaberto E, Cinelli G, Coletti C, Cucchi A, Daraktchieva Z, De Cort M, Domingos F, Dudar T, Elío J, Falletti P, Ferreira A, Finne I, Fuente Merino I, García-Talavera M, Gruber V, Gutiérrez V, Hernandez-Ceballos MA, Hoffmann M, Iurlaro G, Ivanova K, Jones A, Kovalenko G, Kozak K, Lawley R, Lehné R, Lister B, Lucchetti C, Magnoni M, Matolin M, Mazur J, Mazzoli C, Mollo M, Mostacci D, Mundigl S, Nesbor D, Neves L, Nikolov J, Nogarotto A, Onischenko A, Orgiazzi A, Pacherová P, Panagos P, Pokalyuk V, Quindós P, Sassi R, Soligo M, Stoulos S, Szabó K, Täht-Kok K, Todorović N, Tollefsen T, Tuccimei P, Turtiainen T, Tye A, Udovičić V, Vasilyev A, Verdelocco S, Verkhovtsev V, Voltaggio M, Zhukova O, Zhukovsky M. European Atlas of Natural Radiation. 2019;.
doi:10.2760/46388 .

Achatz, Michaela, Ajtić, Jelena, Ballabio, Cristiano, Barnet, Ivan, Bossew, Peter, Brattich, Erika, Briganti, Alessandra, Castelluccio, Mauro, Chiaberto, Enrico, Cinelli, Giorgia, Coletti, Chiara, Cucchi, Anselmo, Daraktchieva, Zornitza, De Cort, Marc, Domingos, Filipa, Dudar, Tamara, Elío, Javier, Falletti, Paolo, Ferreira, Antonio, Finne, Ingvild, Fuente Merino, Ismael, García-Talavera, Marta, Gruber, Valeria, Gutiérrez, Villanueva, Hernandez-Ceballos, Miguel A., Hoffmann, Marcus, Iurlaro, Giorgia, Ivanova, Kremena, Jones, Arwyn, Kovalenko, Grygoriy, Kozak, Krzysztof, Lawley, Russell, Lehné, Rouwen, Lister, Bob, Lucchetti, Carlo, Magnoni, Mauro, Matolin, Milan, Mazur, Jadwiga, Mazzoli, Claudio, Mollo, Mara, Mostacci, Domiziano, Mundigl, Stefan, Nesbor, Dieter, Neves, Luis, Nikolov, Jovana, Nogarotto, Alessio, Onischenko, Aleksandra, Orgiazzi, Alberto, Pacherová, Petra, Panagos, Panos, Pokalyuk, Vladimir, Quindós, Poncela, Sassi, Raffaele, Soligo, Michele, Stoulos, Stylianos, Szabó, Katalin, Täht-Kok, Krista, Todorović, Nataša, Tollefsen, Tore, Tuccimei, Paola, Turtiainen, Tuukka, Tye, Andrew, Udovičić, Vladimir, Vasilyev, Aleksey, Verdelocco, Stefania, Verkhovtsev, Valentyn, Voltaggio, Mario, Zhukova, Olga, Zhukovsky, Michael, "European Atlas of Natural Radiation" (2019),
https://doi.org/10.2760/46388 . .

TY  - JOUR
AU  - Bianchi, Stefano
AU  - Plastino, Wolfango
AU  - Brattich, Erika
AU  - Đurđević, Vladimir
AU  - Longo, Alessandro
AU  - Hernandez-Ceballos, Miguel A.
AU  - Sarvan, Darko
AU  - Ajtić, Jelena
PY  - 2019
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1745
AB  - The activity concentrations of beryllium-7, a natural radiotracer that is considered as a tracer of the strato-spheric-tropospheric exchange, shows a distinct behaviour in Northern Europe compared to the central and southern parts of the continent. In this study, we use the measurements collected at four sampling stations in Scandinavia (Ivalo, Umea, Kista, Risoe) between 2001 and 2010 and investigate their trends, periodicities and residuals with the aim to further understand the common features in the beryllium-7 data records in northern sampling sites. The beryllium-7 activity concentrations exhibit statistically significant positive trends that range from an average value of 1.50%/year to an average value of 2.96%/year. We detect a one-year periodicity in all the sites, and in the southernmost site, Risoe in Denmark, additional higher-frequency harmonics. In the residual time series, we find outliers that represent occurrences of extremely high beryllium-7 activity concentration. Cross-correlations of the beryllium-7 residuals across the four sites decrease with increasing distance; similarly, as indicated by local Hurst exponents the records exhibit long-range correlations that weaken towards the end of the investigated period. To investigate the causes of the detected trends, we also calculate correlations between beryllium-7 and factors related to its production, transport and removal from the atmosphere: in particular, cross-correlations of the beryllium-7 residuals with residuals in sunspot number, local temperature, atmospheric pressure and precipitation, as well as Arctic Oscillation index and North Atlantic Oscillation index. Most of the obtained correlations, however, are not statistically significant, highlighting the need to analyse a longer time period in order to evaluate the impact of different factors on the airborne beryllium-7 activity concentration.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Applied Radiation and Isotopes
T1  - Analysis of trends, periodicities, and correlations in the beryllium-7 time series in Northern Europe
VL  - 148
SP  - 160
EP  - 167
DO  - 10.1016/j.apradiso.2019.03.038
ER  - 

@article{
author = "Bianchi, Stefano and Plastino, Wolfango and Brattich, Erika and Đurđević, Vladimir and Longo, Alessandro and Hernandez-Ceballos, Miguel A. and Sarvan, Darko and Ajtić, Jelena",
year = "2019",
abstract = "The activity concentrations of beryllium-7, a natural radiotracer that is considered as a tracer of the strato-spheric-tropospheric exchange, shows a distinct behaviour in Northern Europe compared to the central and southern parts of the continent. In this study, we use the measurements collected at four sampling stations in Scandinavia (Ivalo, Umea, Kista, Risoe) between 2001 and 2010 and investigate their trends, periodicities and residuals with the aim to further understand the common features in the beryllium-7 data records in northern sampling sites. The beryllium-7 activity concentrations exhibit statistically significant positive trends that range from an average value of 1.50%/year to an average value of 2.96%/year. We detect a one-year periodicity in all the sites, and in the southernmost site, Risoe in Denmark, additional higher-frequency harmonics. In the residual time series, we find outliers that represent occurrences of extremely high beryllium-7 activity concentration. Cross-correlations of the beryllium-7 residuals across the four sites decrease with increasing distance; similarly, as indicated by local Hurst exponents the records exhibit long-range correlations that weaken towards the end of the investigated period. To investigate the causes of the detected trends, we also calculate correlations between beryllium-7 and factors related to its production, transport and removal from the atmosphere: in particular, cross-correlations of the beryllium-7 residuals with residuals in sunspot number, local temperature, atmospheric pressure and precipitation, as well as Arctic Oscillation index and North Atlantic Oscillation index. Most of the obtained correlations, however, are not statistically significant, highlighting the need to analyse a longer time period in order to evaluate the impact of different factors on the airborne beryllium-7 activity concentration.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Applied Radiation and Isotopes",
title = "Analysis of trends, periodicities, and correlations in the beryllium-7 time series in Northern Europe",
volume = "148",
pages = "160-167",
doi = "10.1016/j.apradiso.2019.03.038"
}

Bianchi, S., Plastino, W., Brattich, E., Đurđević, V., Longo, A., Hernandez-Ceballos, M. A., Sarvan, D.,& Ajtić, J.. (2019). Analysis of trends, periodicities, and correlations in the beryllium-7 time series in Northern Europe. in Applied Radiation and Isotopes
Pergamon-Elsevier Science Ltd, Oxford., 148, 160-167.
https://doi.org/10.1016/j.apradiso.2019.03.038

Bianchi S, Plastino W, Brattich E, Đurđević V, Longo A, Hernandez-Ceballos MA, Sarvan D, Ajtić J. Analysis of trends, periodicities, and correlations in the beryllium-7 time series in Northern Europe. in Applied Radiation and Isotopes. 2019;148:160-167.
doi:10.1016/j.apradiso.2019.03.038 .

Bianchi, Stefano, Plastino, Wolfango, Brattich, Erika, Đurđević, Vladimir, Longo, Alessandro, Hernandez-Ceballos, Miguel A., Sarvan, Darko, Ajtić, Jelena, "Analysis of trends, periodicities, and correlations in the beryllium-7 time series in Northern Europe" in Applied Radiation and Isotopes, 148 (2019):160-167,
https://doi.org/10.1016/j.apradiso.2019.03.038 . .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Djurdjević, Vladimir
AU  - Sarvan, Darko
AU  - Brattich, Erika
AU  - Hernández-Ceballos, Miguel Angel
AU  - Zorko, Benjamin
AU  - Todorović, Dragana
PY  - 2019
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2344
AB  - Since 2015, a scientific collaboration network between the University of Belgrade, the University
of Bologna and the Radioactive Monitoring Environmental (REM) group of the European
Commission Joint Research Centre – Ispra, has addressed the characterisation of the beryllium-7
concentration in the surface air recorded across Europe, and its link with meteorological conditions.
A set of studies carried out over this period has been based on the beryllium-7 activity measurements
collected and validated by the Radioactivity Monitoring Environmental Data Bank (REMdb)
(https://rem.jrc.ec.europa.eu/RemWeb/Index.aspx). REMdb makes accessible and understandable
to a wider audience radioactivity measurements made by all European Member States in the air,
water, milk, and mixed diet. Thus, the scientific community is given research opportunities to exploit
a unique collection of almost 5 million environmental radioactivity measurements taken across
Europe since 1988. Our collaboration has also investigated other sets of multidecadal beryllium-7
activity concentrations: 1) sampled in Serbia and measured at the Vinča Institute of Nuclear Sciences,
and 2) sampled in Slovenia and measured at the Jožef Stefan Institute.
This paper compiles our current understanding of the abundance of beryllium-7, which is a
naturally occurring radionuclide, in the surface air in Europe. Beryllium-7 is produced in the upper
troposphere-lower stratosphere (UT-LS) region, where it attaches to fine aerosols and is then
transported through the atmosphere. Due to its origin, it is considered a good tracer of air mass
history, and it can be used as an indicator of different processes in the atmosphere, such as vertical
exchange across the UT-LS region. Based on a number of our previous studies, we here give an
overall picture of the beryllium-7 activity concentration distribution in Europe. We describe its
general decrease from the south of the continent towards the polar region, different periodicities and
outliers identified in the time series, and we make an effort to identify the underlying driving
mechanisms that give rise to this distribution. We also look into temporal trends that show a
statistically significant increase in the beryllium-7 surface concentration. Since temperature is one of
the major factors that influence this radionuclide’s abundance in the air, we speculate that the trends
are affected by the global increase in temperature. For that reason, we intend to further inquire into
the possibility of using the beryllium-7 surface concentration as an indicator of climate change.
PB  - Niš : RAD Centre
C3  - Book of Abstracts of the Seventh International Conference on Radiation in Various Fields of Research, June 10–14, 2019, Herceg Novi, Montenegro
T1  - Temporal and spatial distribution of the beryllium-7 activity concentration in the surface air in Europe
SP  - 9
EP  - 9
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2344
ER  - 

@conference{
author = "Ajtić, Jelena and Djurdjević, Vladimir and Sarvan, Darko and Brattich, Erika and Hernández-Ceballos, Miguel Angel and Zorko, Benjamin and Todorović, Dragana",
year = "2019",
abstract = "Since 2015, a scientific collaboration network between the University of Belgrade, the University
of Bologna and the Radioactive Monitoring Environmental (REM) group of the European
Commission Joint Research Centre – Ispra, has addressed the characterisation of the beryllium-7
concentration in the surface air recorded across Europe, and its link with meteorological conditions.
A set of studies carried out over this period has been based on the beryllium-7 activity measurements
collected and validated by the Radioactivity Monitoring Environmental Data Bank (REMdb)
(https://rem.jrc.ec.europa.eu/RemWeb/Index.aspx). REMdb makes accessible and understandable
to a wider audience radioactivity measurements made by all European Member States in the air,
water, milk, and mixed diet. Thus, the scientific community is given research opportunities to exploit
a unique collection of almost 5 million environmental radioactivity measurements taken across
Europe since 1988. Our collaboration has also investigated other sets of multidecadal beryllium-7
activity concentrations: 1) sampled in Serbia and measured at the Vinča Institute of Nuclear Sciences,
and 2) sampled in Slovenia and measured at the Jožef Stefan Institute.
This paper compiles our current understanding of the abundance of beryllium-7, which is a
naturally occurring radionuclide, in the surface air in Europe. Beryllium-7 is produced in the upper
troposphere-lower stratosphere (UT-LS) region, where it attaches to fine aerosols and is then
transported through the atmosphere. Due to its origin, it is considered a good tracer of air mass
history, and it can be used as an indicator of different processes in the atmosphere, such as vertical
exchange across the UT-LS region. Based on a number of our previous studies, we here give an
overall picture of the beryllium-7 activity concentration distribution in Europe. We describe its
general decrease from the south of the continent towards the polar region, different periodicities and
outliers identified in the time series, and we make an effort to identify the underlying driving
mechanisms that give rise to this distribution. We also look into temporal trends that show a
statistically significant increase in the beryllium-7 surface concentration. Since temperature is one of
the major factors that influence this radionuclide’s abundance in the air, we speculate that the trends
are affected by the global increase in temperature. For that reason, we intend to further inquire into
the possibility of using the beryllium-7 surface concentration as an indicator of climate change.",
publisher = "Niš : RAD Centre",
journal = "Book of Abstracts of the Seventh International Conference on Radiation in Various Fields of Research, June 10–14, 2019, Herceg Novi, Montenegro",
title = "Temporal and spatial distribution of the beryllium-7 activity concentration in the surface air in Europe",
pages = "9-9",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2344"
}

Ajtić, J., Djurdjević, V., Sarvan, D., Brattich, E., Hernández-Ceballos, M. A., Zorko, B.,& Todorović, D.. (2019). Temporal and spatial distribution of the beryllium-7 activity concentration in the surface air in Europe. in Book of Abstracts of the Seventh International Conference on Radiation in Various Fields of Research, June 10–14, 2019, Herceg Novi, Montenegro
Niš : RAD Centre., 9-9.
https://hdl.handle.net/21.15107/rcub_veterinar_2344

Ajtić J, Djurdjević V, Sarvan D, Brattich E, Hernández-Ceballos MA, Zorko B, Todorović D. Temporal and spatial distribution of the beryllium-7 activity concentration in the surface air in Europe. in Book of Abstracts of the Seventh International Conference on Radiation in Various Fields of Research, June 10–14, 2019, Herceg Novi, Montenegro. 2019;:9-9.
https://hdl.handle.net/21.15107/rcub_veterinar_2344 .

Ajtić, Jelena, Djurdjević, Vladimir, Sarvan, Darko, Brattich, Erika, Hernández-Ceballos, Miguel Angel, Zorko, Benjamin, Todorović, Dragana, "Temporal and spatial distribution of the beryllium-7 activity concentration in the surface air in Europe" in Book of Abstracts of the Seventh International Conference on Radiation in Various Fields of Research, June 10–14, 2019, Herceg Novi, Montenegro (2019):9-9,
https://hdl.handle.net/21.15107/rcub_veterinar_2344 .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Brattich, Erika
AU  - Hernández-Ceballos, Miguel Angel
AU  - Djurdjević, Vladimir
PY  - 2019
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2372
AB  - MeĎu najbitnije faktore koji utiču na specifičnu aktivnost berilijuma-7 u prizemnom
sloju atmosfere spadaju temperatura i količina padavina. U ovom radu stoga
razmatramo njihove vremenske trendove izmeĎu 2000. i 2014. godine, na šest lokacija u
Evropi: Madrid i Bilbao (Španija) na jugu; Beč (Austrija) i Luksemburg (Luksemburg)
u centralnoj oblasti; kao i Riso (Danska) i Ivalo (Finska) na severu kontinenta. Podaci
za specifičnu aktivnost berilijuma-7 preuzeti su iz Radioactivity Environmental
Monitoring data bank (REMdb), a podaci za lokalnu temperaturu i količinu padavina iz
E-OBS gridovane klimatologije (verzija 15) i potom bilinearnom interpolacijom
ekstrahovani na šest lokacija uzorkovanja berilijuma-7. Za dobijanje trendova koristili
smo sezonski Kendalov test, u kome se za svaki mesec tokom godine prvo primeni
Man-Kendalov trend test, a potom se rezultati kombinuju. Statistički značajni (p < 0,05)
pozitivni trendovi specifične aktivnosti berilijuma-7 dobijeni su za četiri lokacije:
Madrid (8,71·10-5 Bq·m-3/god), Bilbao (3,13·10-5 Bq·m-3/god), Luksemburg (4,00·10-5
Bq·m-3/god), i Ivalo (1,91·10-5 Bq·m-3/god), a statistički značajan pozitivan trend
temperature detektovan je samo za Madrid. Naša analiza ukazuje na povećanje
koncentracije berilijuma-7 u Evropi tokom 2000–2014, sa izraţenijim trendom na jugu
nego na severu. MeĎutim, kako dobijeni trendovi za temperaturu i količinu padavina
uglavnom nisu statistički značajni, nije moguće razmotriti njihovu meĎusobnu
povezanost. U budućim analizama ovog problema stoga treba uzeti u obzir duţe
vremenske nizove ovih promenljivih.
PB  - Institut za nuklearne nauke „Vinča"
C3  - Zbornik radova sa XXX Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 2–4. oktobar, 2019, Divčibare, Srbija
T1  - Petnaestogodišnji trendovi specifične aktivnosti berilijuma-7 u vazduhu u Evropi
SP  - 29
EP  - 33
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2372
ER  - 

@conference{
author = "Ajtić, Jelena and Brattich, Erika and Hernández-Ceballos, Miguel Angel and Djurdjević, Vladimir",
year = "2019",
abstract = "MeĎu najbitnije faktore koji utiču na specifičnu aktivnost berilijuma-7 u prizemnom
sloju atmosfere spadaju temperatura i količina padavina. U ovom radu stoga
razmatramo njihove vremenske trendove izmeĎu 2000. i 2014. godine, na šest lokacija u
Evropi: Madrid i Bilbao (Španija) na jugu; Beč (Austrija) i Luksemburg (Luksemburg)
u centralnoj oblasti; kao i Riso (Danska) i Ivalo (Finska) na severu kontinenta. Podaci
za specifičnu aktivnost berilijuma-7 preuzeti su iz Radioactivity Environmental
Monitoring data bank (REMdb), a podaci za lokalnu temperaturu i količinu padavina iz
E-OBS gridovane klimatologije (verzija 15) i potom bilinearnom interpolacijom
ekstrahovani na šest lokacija uzorkovanja berilijuma-7. Za dobijanje trendova koristili
smo sezonski Kendalov test, u kome se za svaki mesec tokom godine prvo primeni
Man-Kendalov trend test, a potom se rezultati kombinuju. Statistički značajni (p < 0,05)
pozitivni trendovi specifične aktivnosti berilijuma-7 dobijeni su za četiri lokacije:
Madrid (8,71·10-5 Bq·m-3/god), Bilbao (3,13·10-5 Bq·m-3/god), Luksemburg (4,00·10-5
Bq·m-3/god), i Ivalo (1,91·10-5 Bq·m-3/god), a statistički značajan pozitivan trend
temperature detektovan je samo za Madrid. Naša analiza ukazuje na povećanje
koncentracije berilijuma-7 u Evropi tokom 2000–2014, sa izraţenijim trendom na jugu
nego na severu. MeĎutim, kako dobijeni trendovi za temperaturu i količinu padavina
uglavnom nisu statistički značajni, nije moguće razmotriti njihovu meĎusobnu
povezanost. U budućim analizama ovog problema stoga treba uzeti u obzir duţe
vremenske nizove ovih promenljivih.",
publisher = "Institut za nuklearne nauke „Vinča"",
journal = "Zbornik radova sa XXX Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 2–4. oktobar, 2019, Divčibare, Srbija",
title = "Petnaestogodišnji trendovi specifične aktivnosti berilijuma-7 u vazduhu u Evropi",
pages = "29-33",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2372"
}

Ajtić, J., Brattich, E., Hernández-Ceballos, M. A.,& Djurdjević, V.. (2019). Petnaestogodišnji trendovi specifične aktivnosti berilijuma-7 u vazduhu u Evropi. in Zbornik radova sa XXX Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 2–4. oktobar, 2019, Divčibare, Srbija
Institut za nuklearne nauke „Vinča"., 29-33.
https://hdl.handle.net/21.15107/rcub_veterinar_2372

Ajtić J, Brattich E, Hernández-Ceballos MA, Djurdjević V. Petnaestogodišnji trendovi specifične aktivnosti berilijuma-7 u vazduhu u Evropi. in Zbornik radova sa XXX Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 2–4. oktobar, 2019, Divčibare, Srbija. 2019;:29-33.
https://hdl.handle.net/21.15107/rcub_veterinar_2372 .

Ajtić, Jelena, Brattich, Erika, Hernández-Ceballos, Miguel Angel, Djurdjević, Vladimir, "Petnaestogodišnji trendovi specifične aktivnosti berilijuma-7 u vazduhu u Evropi" in Zbornik radova sa XXX Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 2–4. oktobar, 2019, Divčibare, Srbija (2019):29-33,
https://hdl.handle.net/21.15107/rcub_veterinar_2372 .

TY  - JOUR
AU  - Ajtić, Jelena
AU  - Brattich, Erika
AU  - Sarvan, Darko
AU  - Đurđević, V.
AU  - Hernández-Ceballos, Miguel A.
PY  - 2018
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1649
AB  - Relationships between the beryllium-7 activity concentrations in surface air and meteorological parameters (temperature, atmospheric pressure, and precipitation), teleconnection indices (Arctic Oscillation, North Atlantic Oscillation, and Scandinavian pattern) and number of sunspots are investigated using two multivariate statistical techniques: hierarchical cluster and factor analysis. The beryllium-7 surface measurements over 1995-2011, at four sampling sites located in the Scandinavian Peninsula, are obtained from the Radioactivity Environmental Monitoring Database. In all sites, the statistical analyses show that the beryllium-7 concentrations are strongly linked to temperature. Although the beryllium-7 surface concentration exhibits the well-characterised spring/summer maximum, our study shows that extremely high beryllium-7 concentrations, defined as the values exceeding the 90th percentile in the data records for each site, also occur over the October-March period. Two types of autumn/winter extremes are distinguished: type-1 when the number of extremes in a given month is less than three, and type-2 when at least three extremes occur in a month. Factor analysis performed for these autumn/winter events shows a weaker effect of temperature and a stronger impact of the transport and production signal on the beryllium-7 concentrations. Further, the majority of the type-2 extremes are associated with a very high monthly Scandinavian teleconnection index. The type-2 extremes that occurred in January, February and March are also linked to sudden stratospheric warmings of the Arctic vortex. Our results indicate that the Scandinavian teleconnection index might be a good indicator of the meteorological conditions facilitating extremely high beryllium-7 surface concentrations over Scandinavia during autumn and winter.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Chemosphere
T1  - Factors affecting the Be-7 surface concentration and its extremely high occurrences over the Scandinavian Peninsula during autumn and winter
VL  - 199
SP  - 278
EP  - 285
DO  - 10.1016/j.chemosphere.2018.02.052
ER  - 

@article{
author = "Ajtić, Jelena and Brattich, Erika and Sarvan, Darko and Đurđević, V. and Hernández-Ceballos, Miguel A.",
year = "2018",
abstract = "Relationships between the beryllium-7 activity concentrations in surface air and meteorological parameters (temperature, atmospheric pressure, and precipitation), teleconnection indices (Arctic Oscillation, North Atlantic Oscillation, and Scandinavian pattern) and number of sunspots are investigated using two multivariate statistical techniques: hierarchical cluster and factor analysis. The beryllium-7 surface measurements over 1995-2011, at four sampling sites located in the Scandinavian Peninsula, are obtained from the Radioactivity Environmental Monitoring Database. In all sites, the statistical analyses show that the beryllium-7 concentrations are strongly linked to temperature. Although the beryllium-7 surface concentration exhibits the well-characterised spring/summer maximum, our study shows that extremely high beryllium-7 concentrations, defined as the values exceeding the 90th percentile in the data records for each site, also occur over the October-March period. Two types of autumn/winter extremes are distinguished: type-1 when the number of extremes in a given month is less than three, and type-2 when at least three extremes occur in a month. Factor analysis performed for these autumn/winter events shows a weaker effect of temperature and a stronger impact of the transport and production signal on the beryllium-7 concentrations. Further, the majority of the type-2 extremes are associated with a very high monthly Scandinavian teleconnection index. The type-2 extremes that occurred in January, February and March are also linked to sudden stratospheric warmings of the Arctic vortex. Our results indicate that the Scandinavian teleconnection index might be a good indicator of the meteorological conditions facilitating extremely high beryllium-7 surface concentrations over Scandinavia during autumn and winter.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Chemosphere",
title = "Factors affecting the Be-7 surface concentration and its extremely high occurrences over the Scandinavian Peninsula during autumn and winter",
volume = "199",
pages = "278-285",
doi = "10.1016/j.chemosphere.2018.02.052"
}

Ajtić, J., Brattich, E., Sarvan, D., Đurđević, V.,& Hernández-Ceballos, M. A.. (2018). Factors affecting the Be-7 surface concentration and its extremely high occurrences over the Scandinavian Peninsula during autumn and winter. in Chemosphere
Pergamon-Elsevier Science Ltd, Oxford., 199, 278-285.
https://doi.org/10.1016/j.chemosphere.2018.02.052

Ajtić J, Brattich E, Sarvan D, Đurđević V, Hernández-Ceballos MA. Factors affecting the Be-7 surface concentration and its extremely high occurrences over the Scandinavian Peninsula during autumn and winter. in Chemosphere. 2018;199:278-285.
doi:10.1016/j.chemosphere.2018.02.052 .

Ajtić, Jelena, Brattich, Erika, Sarvan, Darko, Đurđević, V., Hernández-Ceballos, Miguel A., "Factors affecting the Be-7 surface concentration and its extremely high occurrences over the Scandinavian Peninsula during autumn and winter" in Chemosphere, 199 (2018):278-285,
https://doi.org/10.1016/j.chemosphere.2018.02.052 . .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Brattich, Erika
AU  - Hernández-Ceballos, Miguel Angel
AU  - Sarvan, Darko
AU  - Djurdjević, Vladimir
PY  - 2018
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2347
AB  - Beryllium-7 is a cosmogenic radionuclide that, due to its maximum production in the stratosphere and upper troposphere, has often been used as a tracer of vertical transport processes in the atmosphere. In particular, high concentrations of surface airborne beryllium-7 could be a result of an uncommonly fast descent of air masses from the stratosphere into the troposphere. Hence, our aim is to investigate the maxima in the beryllium-7 surface concentrations to better understand the processes associated with the downward transport from the stratosphere to the troposphere. Fourteen locations in Europe, with latitudes ranging between 37 °N and 69 °N, and longitudes between 6 °W and 28 °E, are analysed in our study. Over the 2001–2010 period, the beryllium-7 surface concentration measurements in the chosen sites were performed mostly once a week, giving a total of about 500 data points per each site. The data are contained within the online Radioactivity Environmental Monitoring (REM) Database. We define the beryllium-7 maxima as values exceeding the 95th percentile calculated for each site. Over 2001–2010, 345 maxima are identified for the investigated 14 sites, out of which 61 maxima (18 %) occurred during three consecutive months: May, June and July 2006. Over this period, i.e. summer 2006, the contribution of detected maxima to the total number of maxima for each site ranged between 4 % and 32 %, with six sites showing a contribution of 20 % or larger. This number of extremely high beryllium-7 specific activities concentrated over only three months marks this period as unique. In an attempt to identify underlying mechanisms that are associated with this exceptional episode of high beryllium-7 surface concentrations, we look into the potential vorticity, surface temperature and pressure, and precipitation maps over the region of interest during the time window when the extremes were observed.
PB  - Niš : RAD Association
C3  - 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia
T1  - Extremely high beryllium-7 surface concentrations in Europe: a case study
SP  - 169
EP  - 169
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2347
ER  - 

@conference{
author = "Ajtić, Jelena and Brattich, Erika and Hernández-Ceballos, Miguel Angel and Sarvan, Darko and Djurdjević, Vladimir",
year = "2018",
abstract = "Beryllium-7 is a cosmogenic radionuclide that, due to its maximum production in the stratosphere and upper troposphere, has often been used as a tracer of vertical transport processes in the atmosphere. In particular, high concentrations of surface airborne beryllium-7 could be a result of an uncommonly fast descent of air masses from the stratosphere into the troposphere. Hence, our aim is to investigate the maxima in the beryllium-7 surface concentrations to better understand the processes associated with the downward transport from the stratosphere to the troposphere. Fourteen locations in Europe, with latitudes ranging between 37 °N and 69 °N, and longitudes between 6 °W and 28 °E, are analysed in our study. Over the 2001–2010 period, the beryllium-7 surface concentration measurements in the chosen sites were performed mostly once a week, giving a total of about 500 data points per each site. The data are contained within the online Radioactivity Environmental Monitoring (REM) Database. We define the beryllium-7 maxima as values exceeding the 95th percentile calculated for each site. Over 2001–2010, 345 maxima are identified for the investigated 14 sites, out of which 61 maxima (18 %) occurred during three consecutive months: May, June and July 2006. Over this period, i.e. summer 2006, the contribution of detected maxima to the total number of maxima for each site ranged between 4 % and 32 %, with six sites showing a contribution of 20 % or larger. This number of extremely high beryllium-7 specific activities concentrated over only three months marks this period as unique. In an attempt to identify underlying mechanisms that are associated with this exceptional episode of high beryllium-7 surface concentrations, we look into the potential vorticity, surface temperature and pressure, and precipitation maps over the region of interest during the time window when the extremes were observed.",
publisher = "Niš : RAD Association",
journal = "6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia",
title = "Extremely high beryllium-7 surface concentrations in Europe: a case study",
pages = "169-169",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2347"
}

Ajtić, J., Brattich, E., Hernández-Ceballos, M. A., Sarvan, D.,& Djurdjević, V.. (2018). Extremely high beryllium-7 surface concentrations in Europe: a case study. in 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia
Niš : RAD Association., 169-169.
https://hdl.handle.net/21.15107/rcub_veterinar_2347

Ajtić J, Brattich E, Hernández-Ceballos MA, Sarvan D, Djurdjević V. Extremely high beryllium-7 surface concentrations in Europe: a case study. in 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia. 2018;:169-169.
https://hdl.handle.net/21.15107/rcub_veterinar_2347 .

Ajtić, Jelena, Brattich, Erika, Hernández-Ceballos, Miguel Angel, Sarvan, Darko, Djurdjević, Vladimir, "Extremely high beryllium-7 surface concentrations in Europe: a case study" in 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia (2018):169-169,
https://hdl.handle.net/21.15107/rcub_veterinar_2347 .

TY  - JOUR
AU  - Ajtić, Jelena
AU  - Sarvan, Darko
AU  - Đurđević, Vladimir S.
AU  - Hernández-Ceballos, Miguel A.
AU  - Brattich, Erika
PY  - 2017
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1458
AB  - Seasonal and spatial patterns of extremely high beryllium-7 surface concentration recorded over the 2001-2010 period across Europe are investigated. The beryllium-7 measurements for 14 sites are taken from the Radioactivity Environmental Monitoring Database. The maxima and minima in the annual cycle of the beryllium-7 surface concentration occur later in the year as the latitude of the measurement site decreases. Extremely high beryllium-7 surface concentrations are defined here as values greater than the 95th percentile in each measurement site. Most of the extremes occur over the March-August period. At least 10 % of the total number of extremes appear during autumn and winter, with an exception of Vienna, where all the extremes took place during spring and summer. The regional spread of extremes common to pairs of measurement sites points to an existence of three distinct regions in Europe: north of 55°N, between 45°N and 55°N, and south of 45°N. Although the beryllium-7 concentration records are significantly correlated across all the investigated sites, the strongest correlations are found within the identified regions.
AB  - Sezonska i prostorna raspodela ekstremno visokih specifičnih aktivnosti berilijuma-7 u prizemnom sloju atmosfere analizirane su u ovom radu. Merenja tokom 2001-2010. godine na 14 evropskih stanica preuzeta su iz REMdb-baze podataka Monitoring radioaktivnosti u životnoj sredini. Prvo su razmotreni godišnji ciklusi specifične aktivnosti berilijuma-7 koji pokazuju da se godišnje maksimalne i minimalne srednje mesečne vrednosti pomeraju ka kasnijim mesecima kako se smanjuje geografska širina merne stanice. Za ekstremno visoke vrednosti specifične aktivnosti berilijuma-7 uzete su vrednosti veće od 95-og percentila, koji je izračunat za svaku stanicu posebno. Najveći broj ovih ekstrema događa se od marta do avgusta, a najmanje 10 % od ukupnog broja ekstrema tokom jeseni i zime. Izuzetak je merna stanica Beč na kojoj su se svi ekstremi dogodili tokom proleća i leta. Rasprostranjenost ekstrema koji su zajednički za parove mernih mesta, ukazuje da postoje tri različita regiona u Evropi: severno od 55°N, između 45°N i 55°N, i južno od 45°N. Iako su merenja specifične aktivnosti berilijuma-7 značajno korelisana za sve analizirane stanice, najveći koeficijenti korelacije dobijeni su u okviru ovih regiona.
PB  - Univerzitet u Nišu, Niš
T2  - Facta universitatis - series: Physics, Chemistry and Technology
T1  - Beryllium-7 surface concentration extremes in Europe
T1  - Ekstremno visoke vrednosti specifične aktivnosti berilijuma-7 u prizemnom sloju atmosfere u Evropi
VL  - 15
IS  - 1
SP  - 45
EP  - 55
DO  - 10.2298/FUPCT1701045A
ER  - 

@article{
author = "Ajtić, Jelena and Sarvan, Darko and Đurđević, Vladimir S. and Hernández-Ceballos, Miguel A. and Brattich, Erika",
year = "2017",
abstract = "Seasonal and spatial patterns of extremely high beryllium-7 surface concentration recorded over the 2001-2010 period across Europe are investigated. The beryllium-7 measurements for 14 sites are taken from the Radioactivity Environmental Monitoring Database. The maxima and minima in the annual cycle of the beryllium-7 surface concentration occur later in the year as the latitude of the measurement site decreases. Extremely high beryllium-7 surface concentrations are defined here as values greater than the 95th percentile in each measurement site. Most of the extremes occur over the March-August period. At least 10 % of the total number of extremes appear during autumn and winter, with an exception of Vienna, where all the extremes took place during spring and summer. The regional spread of extremes common to pairs of measurement sites points to an existence of three distinct regions in Europe: north of 55°N, between 45°N and 55°N, and south of 45°N. Although the beryllium-7 concentration records are significantly correlated across all the investigated sites, the strongest correlations are found within the identified regions., Sezonska i prostorna raspodela ekstremno visokih specifičnih aktivnosti berilijuma-7 u prizemnom sloju atmosfere analizirane su u ovom radu. Merenja tokom 2001-2010. godine na 14 evropskih stanica preuzeta su iz REMdb-baze podataka Monitoring radioaktivnosti u životnoj sredini. Prvo su razmotreni godišnji ciklusi specifične aktivnosti berilijuma-7 koji pokazuju da se godišnje maksimalne i minimalne srednje mesečne vrednosti pomeraju ka kasnijim mesecima kako se smanjuje geografska širina merne stanice. Za ekstremno visoke vrednosti specifične aktivnosti berilijuma-7 uzete su vrednosti veće od 95-og percentila, koji je izračunat za svaku stanicu posebno. Najveći broj ovih ekstrema događa se od marta do avgusta, a najmanje 10 % od ukupnog broja ekstrema tokom jeseni i zime. Izuzetak je merna stanica Beč na kojoj su se svi ekstremi dogodili tokom proleća i leta. Rasprostranjenost ekstrema koji su zajednički za parove mernih mesta, ukazuje da postoje tri različita regiona u Evropi: severno od 55°N, između 45°N i 55°N, i južno od 45°N. Iako su merenja specifične aktivnosti berilijuma-7 značajno korelisana za sve analizirane stanice, najveći koeficijenti korelacije dobijeni su u okviru ovih regiona.",
publisher = "Univerzitet u Nišu, Niš",
journal = "Facta universitatis - series: Physics, Chemistry and Technology",
title = "Beryllium-7 surface concentration extremes in Europe, Ekstremno visoke vrednosti specifične aktivnosti berilijuma-7 u prizemnom sloju atmosfere u Evropi",
volume = "15",
number = "1",
pages = "45-55",
doi = "10.2298/FUPCT1701045A"
}

Ajtić, J., Sarvan, D., Đurđević, V. S., Hernández-Ceballos, M. A.,& Brattich, E.. (2017). Beryllium-7 surface concentration extremes in Europe. in Facta universitatis - series: Physics, Chemistry and Technology
Univerzitet u Nišu, Niš., 15(1), 45-55.
https://doi.org/10.2298/FUPCT1701045A

Ajtić J, Sarvan D, Đurđević VS, Hernández-Ceballos MA, Brattich E. Beryllium-7 surface concentration extremes in Europe. in Facta universitatis - series: Physics, Chemistry and Technology. 2017;15(1):45-55.
doi:10.2298/FUPCT1701045A .

Ajtić, Jelena, Sarvan, Darko, Đurđević, Vladimir S., Hernández-Ceballos, Miguel A., Brattich, Erika, "Beryllium-7 surface concentration extremes in Europe" in Facta universitatis - series: Physics, Chemistry and Technology, 15, no. 1 (2017):45-55,
https://doi.org/10.2298/FUPCT1701045A . .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Djurdjević, Vladimir
AU  - Sarvan, Darko
AU  - Brattich, Erika
AU  - Hernández-Ceballos, Miguel Angel
PY  - 2017
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2350
AB  - This work presents an overview of the results obtained in
an analysis of the 7Be activity concentrations recorded in
surface air in Helsinki, Finland, over a 25-year period
(1987-2011), and stored in the online Radioactivity
Environmental Monitoring (REM) database.
First, lagged linear correlations of the 7Be specific
activity with several meteorological variables:
tropopause height (TPH); mean, minimum and
maximum temperature; precipitation (Prec); atmospheric
pressure (Press); potential vorticity (PV) at 300 hPa and
200 hPa; solar zenith angle (SZA); and sunspot number
are analysed (Tab. 1). The time lag in the correlation
calculations is allowed to vary between 0 and 7 days for
TPH, meteorological parameters and PV, and between 0
and 31 days for SZA and sunspot number. The
correlations are calculated for the total set of
measurements as well as for different seasons.
C3  - Book of Abstracts of the Fourth International Conference on Environmental Radioactivity: Radionuclides as Tracers of Environmental Processes (ENVIRA2017), 29 May – 2 June, 2017, Vilnius, Lithuania
T1  - Analysis of beryllium-7 variability in northern Europe
SP  - 87
EP  - 87
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2350
ER  - 

@conference{
author = "Ajtić, Jelena and Djurdjević, Vladimir and Sarvan, Darko and Brattich, Erika and Hernández-Ceballos, Miguel Angel",
year = "2017",
abstract = "This work presents an overview of the results obtained in
an analysis of the 7Be activity concentrations recorded in
surface air in Helsinki, Finland, over a 25-year period
(1987-2011), and stored in the online Radioactivity
Environmental Monitoring (REM) database.
First, lagged linear correlations of the 7Be specific
activity with several meteorological variables:
tropopause height (TPH); mean, minimum and
maximum temperature; precipitation (Prec); atmospheric
pressure (Press); potential vorticity (PV) at 300 hPa and
200 hPa; solar zenith angle (SZA); and sunspot number
are analysed (Tab. 1). The time lag in the correlation
calculations is allowed to vary between 0 and 7 days for
TPH, meteorological parameters and PV, and between 0
and 31 days for SZA and sunspot number. The
correlations are calculated for the total set of
measurements as well as for different seasons.",
journal = "Book of Abstracts of the Fourth International Conference on Environmental Radioactivity: Radionuclides as Tracers of Environmental Processes (ENVIRA2017), 29 May – 2 June, 2017, Vilnius, Lithuania",
title = "Analysis of beryllium-7 variability in northern Europe",
pages = "87-87",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2350"
}

Ajtić, J., Djurdjević, V., Sarvan, D., Brattich, E.,& Hernández-Ceballos, M. A.. (2017). Analysis of beryllium-7 variability in northern Europe. in Book of Abstracts of the Fourth International Conference on Environmental Radioactivity: Radionuclides as Tracers of Environmental Processes (ENVIRA2017), 29 May – 2 June, 2017, Vilnius, Lithuania, 87-87.
https://hdl.handle.net/21.15107/rcub_veterinar_2350

Ajtić J, Djurdjević V, Sarvan D, Brattich E, Hernández-Ceballos MA. Analysis of beryllium-7 variability in northern Europe. in Book of Abstracts of the Fourth International Conference on Environmental Radioactivity: Radionuclides as Tracers of Environmental Processes (ENVIRA2017), 29 May – 2 June, 2017, Vilnius, Lithuania. 2017;:87-87.
https://hdl.handle.net/21.15107/rcub_veterinar_2350 .

Ajtić, Jelena, Djurdjević, Vladimir, Sarvan, Darko, Brattich, Erika, Hernández-Ceballos, Miguel Angel, "Analysis of beryllium-7 variability in northern Europe" in Book of Abstracts of the Fourth International Conference on Environmental Radioactivity: Radionuclides as Tracers of Environmental Processes (ENVIRA2017), 29 May – 2 June, 2017, Vilnius, Lithuania (2017):87-87,
https://hdl.handle.net/21.15107/rcub_veterinar_2350 .

TY  - CONF
AU  - Hernández-Ceballos, Miguel Angel
AU  - Brattich, Erika
AU  - Ajtić, Jelena
AU  - Cinelli, G.
AU  - Djurdjević, Vladimir
AU  - Sarvan, Darko
AU  - Tollefsen, T.
PY  - 2017
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2351
AB  - Under the terms of Article 36 of the Euratom Treaty,
European Union Member States (MSs) shall periodically
communicate to the European Commission (EC)
information on environmental radioactivity levels. These
results have been introduced into the Radioactivity
Environmental Monitoring database (REMdb) of the EC
Joint Research Centre (JRC) sited in Ispra (Italy)
(https://rem.jrc.ec.europa.eu/RemWeb/).
The initial purpose of the REMdb was to bring together
environmental radioactivity data produced in the
aftermath of the Chernobyl accident, and to store them in
a harmonised manner. Thus the database has two main
objectives: 1) to collect the environmental radioactivity
data gathered through the national environmental
monitoring programs of the MSs to prepare
comprehensive annual monitoring reports; and 2) to keep
a historical record of the radiological accidents for
scientific studies.
Nowadays, containing nearly two million records of
radioactivity levels in milk, water, air and mixed diet
received from the MSs, the REMdb offers the scientific
community dealing with environmental radioactivity
endless research opportunities.
The records stored in REMdb prior to 2007 are fully
public, while the access to the data from the 2007-2015
period can be granted only after explicit request. This
fact makes the REMdb a useful and unique pillar on
which to perform environmental radioactivity studies at
the European level, and which can be considered as a
liaison platform between national and international
scientific groups conducting collaborative research.
C3  - Book of Abstracts of the Fourth International Conference on Environmental Radioactivity: Radionuclides as Tracers of Environmental Processes (ENVIRA2017), 29 May – 2 June, 2017, Vilnius, Lithuania
T1  - REMdb as a framework for collaborations in environmental radioactivity research
SP  - 65
EP  - 65
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2351
ER  - 

@conference{
author = "Hernández-Ceballos, Miguel Angel and Brattich, Erika and Ajtić, Jelena and Cinelli, G. and Djurdjević, Vladimir and Sarvan, Darko and Tollefsen, T.",
year = "2017",
abstract = "Under the terms of Article 36 of the Euratom Treaty,
European Union Member States (MSs) shall periodically
communicate to the European Commission (EC)
information on environmental radioactivity levels. These
results have been introduced into the Radioactivity
Environmental Monitoring database (REMdb) of the EC
Joint Research Centre (JRC) sited in Ispra (Italy)
(https://rem.jrc.ec.europa.eu/RemWeb/).
The initial purpose of the REMdb was to bring together
environmental radioactivity data produced in the
aftermath of the Chernobyl accident, and to store them in
a harmonised manner. Thus the database has two main
objectives: 1) to collect the environmental radioactivity
data gathered through the national environmental
monitoring programs of the MSs to prepare
comprehensive annual monitoring reports; and 2) to keep
a historical record of the radiological accidents for
scientific studies.
Nowadays, containing nearly two million records of
radioactivity levels in milk, water, air and mixed diet
received from the MSs, the REMdb offers the scientific
community dealing with environmental radioactivity
endless research opportunities.
The records stored in REMdb prior to 2007 are fully
public, while the access to the data from the 2007-2015
period can be granted only after explicit request. This
fact makes the REMdb a useful and unique pillar on
which to perform environmental radioactivity studies at
the European level, and which can be considered as a
liaison platform between national and international
scientific groups conducting collaborative research.",
journal = "Book of Abstracts of the Fourth International Conference on Environmental Radioactivity: Radionuclides as Tracers of Environmental Processes (ENVIRA2017), 29 May – 2 June, 2017, Vilnius, Lithuania",
title = "REMdb as a framework for collaborations in environmental radioactivity research",
pages = "65-65",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2351"
}

Hernández-Ceballos, M. A., Brattich, E., Ajtić, J., Cinelli, G., Djurdjević, V., Sarvan, D.,& Tollefsen, T.. (2017). REMdb as a framework for collaborations in environmental radioactivity research. in Book of Abstracts of the Fourth International Conference on Environmental Radioactivity: Radionuclides as Tracers of Environmental Processes (ENVIRA2017), 29 May – 2 June, 2017, Vilnius, Lithuania, 65-65.
https://hdl.handle.net/21.15107/rcub_veterinar_2351

Hernández-Ceballos MA, Brattich E, Ajtić J, Cinelli G, Djurdjević V, Sarvan D, Tollefsen T. REMdb as a framework for collaborations in environmental radioactivity research. in Book of Abstracts of the Fourth International Conference on Environmental Radioactivity: Radionuclides as Tracers of Environmental Processes (ENVIRA2017), 29 May – 2 June, 2017, Vilnius, Lithuania. 2017;:65-65.
https://hdl.handle.net/21.15107/rcub_veterinar_2351 .

Hernández-Ceballos, Miguel Angel, Brattich, Erika, Ajtić, Jelena, Cinelli, G., Djurdjević, Vladimir, Sarvan, Darko, Tollefsen, T., "REMdb as a framework for collaborations in environmental radioactivity research" in Book of Abstracts of the Fourth International Conference on Environmental Radioactivity: Radionuclides as Tracers of Environmental Processes (ENVIRA2017), 29 May – 2 June, 2017, Vilnius, Lithuania (2017):65-65,
https://hdl.handle.net/21.15107/rcub_veterinar_2351 .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Đurđević, Vladimir
AU  - Sarvan, Darko
AU  - Brattich, Erika
AU  - Hernandez-Ceballos, Miguel A.
PY  - 2016
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1335
AB  - This analysis presents linear correlations of beryllium-7 specific activity in surface air with several variables measured in Helsinki, Finland, over 1987-2011. Measurements of beryllium-7 are linearly correlated with the following 10 variables: tropopause height; mean, minimum and maximum temperature; precipitation; atmospheric pressure; potential vorticity at 300 hPa and 200 hPa; solar zenith angle; and the number of sunspots. A time lag is also introduced into the calculations of Pearsons linear correlation coefficients, i.e. the beryllium-7 specific activity measured on a day is correlated with a value of a given variable measured on some preceding day. In particular, the time lag is allowed to vary between 0 and 7 days for tropopause height, meteorological parameters and potential vorticity, and between 0 and 31 days for solar zenith angle and number of sunspots. In this way, we obtain sets of correlation coefficients for each pair of the analysed variables, in which we look for the maximum correlation coefficient as well as for the time lag on which this value is reached. In addition to investigating all of the available measurements, the time series are further split into seasonal subsets. Weak to moderate maximum correlation coefficients, ranging between 0.29 and 0.44, are found for the beryllium-7 specific activity with the tropopause height, temperatures and atmospheric pressure. These correlations are reached with a time lag of 0-2 days. Seasonal correlation coefficients show that the strongest linear relationships are obtained in summer. Similarly, a moderate correlation (0.48) with the solar zenith angle is reached with a time lag of 0 days, but the seasonal correlation coefficients in this case show a weaker relationship during different seasons. On the other hand, our analysis suggests that the correlations of beryllium-7 with precipitation, potential vorticity and the number of sunspots are not statistically significant.
PB  - RAD Association
C3  - Fourth International Conference on Radiation and Applications in Various Fields of Research
T1  - Beryllium-7 specific activity in surface air and its correlation with meteorological variables, solar zenith angle, and number of sunspots
SP  - 79
EP  - 83
DO  - 10.21175/RadProc.2016.19
ER  - 

@conference{
author = "Ajtić, Jelena and Đurđević, Vladimir and Sarvan, Darko and Brattich, Erika and Hernandez-Ceballos, Miguel A.",
year = "2016",
abstract = "This analysis presents linear correlations of beryllium-7 specific activity in surface air with several variables measured in Helsinki, Finland, over 1987-2011. Measurements of beryllium-7 are linearly correlated with the following 10 variables: tropopause height; mean, minimum and maximum temperature; precipitation; atmospheric pressure; potential vorticity at 300 hPa and 200 hPa; solar zenith angle; and the number of sunspots. A time lag is also introduced into the calculations of Pearsons linear correlation coefficients, i.e. the beryllium-7 specific activity measured on a day is correlated with a value of a given variable measured on some preceding day. In particular, the time lag is allowed to vary between 0 and 7 days for tropopause height, meteorological parameters and potential vorticity, and between 0 and 31 days for solar zenith angle and number of sunspots. In this way, we obtain sets of correlation coefficients for each pair of the analysed variables, in which we look for the maximum correlation coefficient as well as for the time lag on which this value is reached. In addition to investigating all of the available measurements, the time series are further split into seasonal subsets. Weak to moderate maximum correlation coefficients, ranging between 0.29 and 0.44, are found for the beryllium-7 specific activity with the tropopause height, temperatures and atmospheric pressure. These correlations are reached with a time lag of 0-2 days. Seasonal correlation coefficients show that the strongest linear relationships are obtained in summer. Similarly, a moderate correlation (0.48) with the solar zenith angle is reached with a time lag of 0 days, but the seasonal correlation coefficients in this case show a weaker relationship during different seasons. On the other hand, our analysis suggests that the correlations of beryllium-7 with precipitation, potential vorticity and the number of sunspots are not statistically significant.",
publisher = "RAD Association",
journal = "Fourth International Conference on Radiation and Applications in Various Fields of Research",
title = "Beryllium-7 specific activity in surface air and its correlation with meteorological variables, solar zenith angle, and number of sunspots",
pages = "79-83",
doi = "10.21175/RadProc.2016.19"
}

Ajtić, J., Đurđević, V., Sarvan, D., Brattich, E.,& Hernandez-Ceballos, M. A.. (2016). Beryllium-7 specific activity in surface air and its correlation with meteorological variables, solar zenith angle, and number of sunspots. in Fourth International Conference on Radiation and Applications in Various Fields of Research
RAD Association., 79-83.
https://doi.org/10.21175/RadProc.2016.19

Ajtić J, Đurđević V, Sarvan D, Brattich E, Hernandez-Ceballos MA. Beryllium-7 specific activity in surface air and its correlation with meteorological variables, solar zenith angle, and number of sunspots. in Fourth International Conference on Radiation and Applications in Various Fields of Research. 2016;:79-83.
doi:10.21175/RadProc.2016.19 .

Ajtić, Jelena, Đurđević, Vladimir, Sarvan, Darko, Brattich, Erika, Hernandez-Ceballos, Miguel A., "Beryllium-7 specific activity in surface air and its correlation with meteorological variables, solar zenith angle, and number of sunspots" in Fourth International Conference on Radiation and Applications in Various Fields of Research (2016):79-83,
https://doi.org/10.21175/RadProc.2016.19 . .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Djurdjević, Vladimir
AU  - Sarvan, Darko
AU  - Brattich, Erika
AU  - Hernández-Ceballos, Miguel Angel
PY  - 2016
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2365
AB  - The maxima in a large dataset of the beryllium-7 specific activities measured in surface air in
Helsinki, Finland, over 25 years (1987-2011), are analysed. The measurements at this station were
performed with a varying temporal resolution: weekly until 1999, and daily, or once in two days,
in the subsequent years, with a final dataset consisting of more than 4000 measurements. These
data are stored by the online Radioactivity Environmental Monitoring (REM) Database.
The beryllium-7 extremes in this dataset are defined as events with the beryllium-7 specific
activity above the 95thpercentile, or in other words, as the maximum 5 % of the measured values.
Specifically, for the Helsinki data set, this threshold is 4.82·10-3 Bq m-3. The beryllium-7 specific
activity in Helsinki shows a seasonal pattern with the monthly means above 2.00·10-3 Bq m-3
during the warm season (April–September), and below 2.00·10-3 Bq m-3during the cold season
(October–March). The analysis of the extremes shows that 90 % occurred in the warm season,
and the remaining 10 % in the cold season. The occurrence of the extreme beryllium-7 events
during the cold season is therefore of particular interest, and these “cold extremes” are analysed
in more detail.
Amongst the cold extremes, three extreme episodes are identified. These episodes, which
occurred in March 1999, February 2003 and February 2005, show extremely high berrylium-7
specific activities measured over several consecutive days. Potential vorticity and surface
temperature maps over Europe are investigated in attempt to find underlying mechanisms that
cause high concentrations of beryllium-7 in surface air during the cold season.
PB  - Niš : University, Faculty of Electronic Engineering
C3  - Book of Abstracts of the Fourth International Conference on Radiation and Applications in Various Fields of Research, May 23–27, 2016, Niš, Serbia
T1  - Analysis of extreme beryllium-7 specific activities in surface air
SP  - 411
EP  - 411
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2365
ER  - 

@conference{
author = "Ajtić, Jelena and Djurdjević, Vladimir and Sarvan, Darko and Brattich, Erika and Hernández-Ceballos, Miguel Angel",
year = "2016",
abstract = "The maxima in a large dataset of the beryllium-7 specific activities measured in surface air in
Helsinki, Finland, over 25 years (1987-2011), are analysed. The measurements at this station were
performed with a varying temporal resolution: weekly until 1999, and daily, or once in two days,
in the subsequent years, with a final dataset consisting of more than 4000 measurements. These
data are stored by the online Radioactivity Environmental Monitoring (REM) Database.
The beryllium-7 extremes in this dataset are defined as events with the beryllium-7 specific
activity above the 95thpercentile, or in other words, as the maximum 5 % of the measured values.
Specifically, for the Helsinki data set, this threshold is 4.82·10-3 Bq m-3. The beryllium-7 specific
activity in Helsinki shows a seasonal pattern with the monthly means above 2.00·10-3 Bq m-3
during the warm season (April–September), and below 2.00·10-3 Bq m-3during the cold season
(October–March). The analysis of the extremes shows that 90 % occurred in the warm season,
and the remaining 10 % in the cold season. The occurrence of the extreme beryllium-7 events
during the cold season is therefore of particular interest, and these “cold extremes” are analysed
in more detail.
Amongst the cold extremes, three extreme episodes are identified. These episodes, which
occurred in March 1999, February 2003 and February 2005, show extremely high berrylium-7
specific activities measured over several consecutive days. Potential vorticity and surface
temperature maps over Europe are investigated in attempt to find underlying mechanisms that
cause high concentrations of beryllium-7 in surface air during the cold season.",
publisher = "Niš : University, Faculty of Electronic Engineering",
journal = "Book of Abstracts of the Fourth International Conference on Radiation and Applications in Various Fields of Research, May 23–27, 2016, Niš, Serbia",
title = "Analysis of extreme beryllium-7 specific activities in surface air",
pages = "411-411",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2365"
}

Ajtić, J., Djurdjević, V., Sarvan, D., Brattich, E.,& Hernández-Ceballos, M. A.. (2016). Analysis of extreme beryllium-7 specific activities in surface air. in Book of Abstracts of the Fourth International Conference on Radiation and Applications in Various Fields of Research, May 23–27, 2016, Niš, Serbia
Niš : University, Faculty of Electronic Engineering., 411-411.
https://hdl.handle.net/21.15107/rcub_veterinar_2365

Ajtić J, Djurdjević V, Sarvan D, Brattich E, Hernández-Ceballos MA. Analysis of extreme beryllium-7 specific activities in surface air. in Book of Abstracts of the Fourth International Conference on Radiation and Applications in Various Fields of Research, May 23–27, 2016, Niš, Serbia. 2016;:411-411.
https://hdl.handle.net/21.15107/rcub_veterinar_2365 .

Ajtić, Jelena, Djurdjević, Vladimir, Sarvan, Darko, Brattich, Erika, Hernández-Ceballos, Miguel Angel, "Analysis of extreme beryllium-7 specific activities in surface air" in Book of Abstracts of the Fourth International Conference on Radiation and Applications in Various Fields of Research, May 23–27, 2016, Niš, Serbia (2016):411-411,
https://hdl.handle.net/21.15107/rcub_veterinar_2365 .

TY  - JOUR
AU  - Ajtić, Jelena
AU  - Djurdjević, Vladimir
AU  - Sarvan, Darko
AU  - Brattich, Erika
AU  - Hernández-Ceballos, Miguel Angel
PY  - 2016
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2369
AB  - We present an analysis of the maxima in a large dataset of the beryllium-7 specific activities measured in
surface air in Helsinki, Finland, over 25 years (1987-2011), which are stored in the online Radioactivity
Environmental Monitoring (REM) database. The maxima are defined as events with the beryllium-7 specific activity
above the 95th percentile, which, for the Helsinki data set, equals to 4.8210-3 Bqm-3. The beryllium-7 specific activity
in Helsinki shows a seasonal pattern with the monthly means above 2.0010-3 Bqm-3 during the warm season (April–
September), and below 2.0010-3 Bqm-3 during the cold season (October–March). The analysis of the extremes shows
that 10 % occurred in the cold season, and these “cold extremes” are analysed in more detail. Amongst the cold
extremes, three representative “episodes” are identified. The episodes, which occurred in March 1999, February 2003
and February 2005, show extremely high beryllium-7 specific activities measured over several consecutive days.
Anomalies of potential vorticity, sea level pressure and surface temperature, as well as precipitation, over Europe
and the Atlantic are investigated. A brief analysis of one cold extreme, classified as “burst” since it was an isolated
event surrounded by measurements below the 95th percentile, is also presented in an attempt to find common
mechanisms that contribute to both cold extreme episodes and bursts. Scandinavia teleconnection index seems to
represent a good indicator of potentially preferential atmospheric conditions that could lead to cold extreme episode
occurrences in the Scandinavian region.
PB  - Niš : RAD Association
T2  - Radiation & Applications
T1  - Analysis of extreme beryllium-7 specific activities in surface air
VL  - 1
IS  - 3
DO  - 10.21175/RadJ.2016.03.040
ER  - 

@article{
author = "Ajtić, Jelena and Djurdjević, Vladimir and Sarvan, Darko and Brattich, Erika and Hernández-Ceballos, Miguel Angel",
year = "2016",
abstract = "We present an analysis of the maxima in a large dataset of the beryllium-7 specific activities measured in
surface air in Helsinki, Finland, over 25 years (1987-2011), which are stored in the online Radioactivity
Environmental Monitoring (REM) database. The maxima are defined as events with the beryllium-7 specific activity
above the 95th percentile, which, for the Helsinki data set, equals to 4.8210-3 Bqm-3. The beryllium-7 specific activity
in Helsinki shows a seasonal pattern with the monthly means above 2.0010-3 Bqm-3 during the warm season (April–
September), and below 2.0010-3 Bqm-3 during the cold season (October–March). The analysis of the extremes shows
that 10 % occurred in the cold season, and these “cold extremes” are analysed in more detail. Amongst the cold
extremes, three representative “episodes” are identified. The episodes, which occurred in March 1999, February 2003
and February 2005, show extremely high beryllium-7 specific activities measured over several consecutive days.
Anomalies of potential vorticity, sea level pressure and surface temperature, as well as precipitation, over Europe
and the Atlantic are investigated. A brief analysis of one cold extreme, classified as “burst” since it was an isolated
event surrounded by measurements below the 95th percentile, is also presented in an attempt to find common
mechanisms that contribute to both cold extreme episodes and bursts. Scandinavia teleconnection index seems to
represent a good indicator of potentially preferential atmospheric conditions that could lead to cold extreme episode
occurrences in the Scandinavian region.",
publisher = "Niš : RAD Association",
journal = "Radiation & Applications",
title = "Analysis of extreme beryllium-7 specific activities in surface air",
volume = "1",
number = "3",
doi = "10.21175/RadJ.2016.03.040"
}

Ajtić, J., Djurdjević, V., Sarvan, D., Brattich, E.,& Hernández-Ceballos, M. A.. (2016). Analysis of extreme beryllium-7 specific activities in surface air. in Radiation & Applications
Niš : RAD Association., 1(3).
https://doi.org/10.21175/RadJ.2016.03.040

Ajtić J, Djurdjević V, Sarvan D, Brattich E, Hernández-Ceballos MA. Analysis of extreme beryllium-7 specific activities in surface air. in Radiation & Applications. 2016;1(3).
doi:10.21175/RadJ.2016.03.040 .

Ajtić, Jelena, Djurdjević, Vladimir, Sarvan, Darko, Brattich, Erika, Hernández-Ceballos, Miguel Angel, "Analysis of extreme beryllium-7 specific activities in surface air" in Radiation & Applications, 1, no. 3 (2016),
https://doi.org/10.21175/RadJ.2016.03.040 . .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Djurdjević, Vladimir
AU  - Hernández-Ceballos, Miguel Angel
AU  - Brattich, Erika
PY  - 2016
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2356
AB  - Specific activity of cosmogenic 7
Be in surface air generally shows a spring-summer maximum. However,
extremely high 7
Be concentrations in surface air also occur during winter. The aim of our analysis is to
characterise temporal and spatial prevalence of winter extreme events, and to investigate the associated
synoptic meteorological conditions in northern Europe. Four measurement sites, with an approximate weekly
sampling rate over the 2001–2010 period, are selected from the online Radioactivity Environmental
Monitoring (REM) Database. The extremes in the 7
Be surface concentration are defined as measurements
above the 90th percentile in each location.The results indicate that at each measurement site, 10–20 % of the
extremes occur during winter (November, December, January and February). Two types of 7
Be extremes are
distinguished: 1) approximately half of these occurrences are isolated events detected in one or two stations,
and 2) the other half are events grouped within four months, when at least three 7
Be extremes per month are
observed. The monthly Scandinavia (SCAND) teleconnection index for isolated extreme events (type-1) is
positive and, with only one exception, larger than 0.4, while in the case of type-2 events, the monthly
SCAND is very high (larger than 1).This finding implies that in northern Europe during winter, the
atmospheric conditions associated with a high SCAND index facilitate an occurrence of extreme 7
Be surface
concentration.
C3  - Proceedings of the Second International Conference on Radioecological Concentrations Processes (50 years later), November 6–9, 2016, Seville, Spain
T1  - Winter extremes of beryllium-7 surface concentrations in northern Europe
SP  - I3
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2356
ER  - 

@conference{
author = "Ajtić, Jelena and Djurdjević, Vladimir and Hernández-Ceballos, Miguel Angel and Brattich, Erika",
year = "2016",
abstract = "Specific activity of cosmogenic 7
Be in surface air generally shows a spring-summer maximum. However,
extremely high 7
Be concentrations in surface air also occur during winter. The aim of our analysis is to
characterise temporal and spatial prevalence of winter extreme events, and to investigate the associated
synoptic meteorological conditions in northern Europe. Four measurement sites, with an approximate weekly
sampling rate over the 2001–2010 period, are selected from the online Radioactivity Environmental
Monitoring (REM) Database. The extremes in the 7
Be surface concentration are defined as measurements
above the 90th percentile in each location.The results indicate that at each measurement site, 10–20 % of the
extremes occur during winter (November, December, January and February). Two types of 7
Be extremes are
distinguished: 1) approximately half of these occurrences are isolated events detected in one or two stations,
and 2) the other half are events grouped within four months, when at least three 7
Be extremes per month are
observed. The monthly Scandinavia (SCAND) teleconnection index for isolated extreme events (type-1) is
positive and, with only one exception, larger than 0.4, while in the case of type-2 events, the monthly
SCAND is very high (larger than 1).This finding implies that in northern Europe during winter, the
atmospheric conditions associated with a high SCAND index facilitate an occurrence of extreme 7
Be surface
concentration.",
journal = "Proceedings of the Second International Conference on Radioecological Concentrations Processes (50 years later), November 6–9, 2016, Seville, Spain",
title = "Winter extremes of beryllium-7 surface concentrations in northern Europe",
pages = "I3",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2356"
}

Ajtić, J., Djurdjević, V., Hernández-Ceballos, M. A.,& Brattich, E.. (2016). Winter extremes of beryllium-7 surface concentrations in northern Europe. in Proceedings of the Second International Conference on Radioecological Concentrations Processes (50 years later), November 6–9, 2016, Seville, Spain, I3.
https://hdl.handle.net/21.15107/rcub_veterinar_2356

Ajtić J, Djurdjević V, Hernández-Ceballos MA, Brattich E. Winter extremes of beryllium-7 surface concentrations in northern Europe. in Proceedings of the Second International Conference on Radioecological Concentrations Processes (50 years later), November 6–9, 2016, Seville, Spain. 2016;:I3.
https://hdl.handle.net/21.15107/rcub_veterinar_2356 .

Ajtić, Jelena, Djurdjević, Vladimir, Hernández-Ceballos, Miguel Angel, Brattich, Erika, "Winter extremes of beryllium-7 surface concentrations in northern Europe" in Proceedings of the Second International Conference on Radioecological Concentrations Processes (50 years later), November 6–9, 2016, Seville, Spain (2016):I3,
https://hdl.handle.net/21.15107/rcub_veterinar_2356 .

TY  - JOUR
AU  - Hernández-Ceballos, Miguel A.
AU  - Brattich, Erika
AU  - Cinelli, Giorgia
AU  - Ajtić, Jelena
AU  - Đurđević, Vladimir
PY  - 2016
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1406
AB  - This study aims at analysing the latitudinal variability of both the yearly and seasonal pattern of Be-7 surface activity concentrations, at addressing the impact of tropopause height (TPH) on Be-7 distribution and at evaluating the time lag between TPH and Be-7 at European level. With this aim, weekly Be-7 and daily TPH data at 17 sampling stations during 10 yr (2001-2010) are analysed. Be-7 shows a clear increasing tendency in the period and generally tends to increase with decreasing latitude. The seasonal pattern generally shows maxima during the warm period and minima during the cold one. The seasonal variogram analysis points out a good spatial correlation for TPH data while a weaker one is observed for Be-7, having TPH a larger influence on Be-7 during summer. The influence of TPH on Be-7 exhibits a large spatial variability, with a clear gap between south and north in the area of the polar front jet. The results identify the presence of two main groups, in particular separating between stations located in northern Europe (50 degrees N and higher) and stations in southern Europe (south of 50 degrees N). A similar behaviour for stations located in the same geographical area is also observed when looking at the day of maximum impact of TPH on Be-7 concentrations. The results suggest that Be-7 concentrations respond in different time ranges to changes in the TPH, observing seasonal differences in each group. These results represent the first European approach to the understanding of the TPH impact on Be-7 concentrations at surface levels.
PB  - Taylor & Francis Ltd, Abingdon
T2  - Tellus Series B-Chemical and Physical Meteorology
T1  - Seasonality of 7 Be concentrations in Europe and influence of tropopause height
VL  - 68
SP  - 29534
DO  - 10.3402/tellusb.v68.29534
ER  - 

@article{
author = "Hernández-Ceballos, Miguel A. and Brattich, Erika and Cinelli, Giorgia and Ajtić, Jelena and Đurđević, Vladimir",
year = "2016",
abstract = "This study aims at analysing the latitudinal variability of both the yearly and seasonal pattern of Be-7 surface activity concentrations, at addressing the impact of tropopause height (TPH) on Be-7 distribution and at evaluating the time lag between TPH and Be-7 at European level. With this aim, weekly Be-7 and daily TPH data at 17 sampling stations during 10 yr (2001-2010) are analysed. Be-7 shows a clear increasing tendency in the period and generally tends to increase with decreasing latitude. The seasonal pattern generally shows maxima during the warm period and minima during the cold one. The seasonal variogram analysis points out a good spatial correlation for TPH data while a weaker one is observed for Be-7, having TPH a larger influence on Be-7 during summer. The influence of TPH on Be-7 exhibits a large spatial variability, with a clear gap between south and north in the area of the polar front jet. The results identify the presence of two main groups, in particular separating between stations located in northern Europe (50 degrees N and higher) and stations in southern Europe (south of 50 degrees N). A similar behaviour for stations located in the same geographical area is also observed when looking at the day of maximum impact of TPH on Be-7 concentrations. The results suggest that Be-7 concentrations respond in different time ranges to changes in the TPH, observing seasonal differences in each group. These results represent the first European approach to the understanding of the TPH impact on Be-7 concentrations at surface levels.",
publisher = "Taylor & Francis Ltd, Abingdon",
journal = "Tellus Series B-Chemical and Physical Meteorology",
title = "Seasonality of 7 Be concentrations in Europe and influence of tropopause height",
volume = "68",
pages = "29534",
doi = "10.3402/tellusb.v68.29534"
}

Hernández-Ceballos, M. A., Brattich, E., Cinelli, G., Ajtić, J.,& Đurđević, V.. (2016). Seasonality of 7 Be concentrations in Europe and influence of tropopause height. in Tellus Series B-Chemical and Physical Meteorology
Taylor & Francis Ltd, Abingdon., 68, 29534.
https://doi.org/10.3402/tellusb.v68.29534

Hernández-Ceballos MA, Brattich E, Cinelli G, Ajtić J, Đurđević V. Seasonality of 7 Be concentrations in Europe and influence of tropopause height. in Tellus Series B-Chemical and Physical Meteorology. 2016;68:29534.
doi:10.3402/tellusb.v68.29534 .

Hernández-Ceballos, Miguel A., Brattich, Erika, Cinelli, Giorgia, Ajtić, Jelena, Đurđević, Vladimir, "Seasonality of 7 Be concentrations in Europe and influence of tropopause height" in Tellus Series B-Chemical and Physical Meteorology, 68 (2016):29534,
https://doi.org/10.3402/tellusb.v68.29534 . .