Analysis of extreme beryllium-7 specific activities in surface air
Аутори
Ajtić, JelenaDjurdjević, Vladimir
Sarvan, Darko
Brattich, Erika
Hernández-Ceballos, Miguel Angel
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
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 c...onsecutive 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.
Кључне речи:
Beryllium-7 / surface air / maximum concentrations / PV / Scandinavia teleconnection indexИзвор:
Radiation & Applications, 2016, 1, 3Издавач:
- Niš : RAD Association
Финансирање / пројекти:
- Истраживање климатских промена и њиховог утицаја на животну средину - праћење утицаја, адаптација и ублажавање (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-43007)
Колекције
Институција/група
Fakultet veterinarske medicineTY - 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 . .