Winter extremes of beryllium-7 surface concentrations in northern Europe
Апстракт
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 wi...thin 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.
Кључне речи:
7 Be / surface air / winter / northern EuropeИзвор:
Proceedings of the Second International Conference on Radioecological Concentrations Processes (50 years later), November 6–9, 2016, Seville, Spain, 2016, I3-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 - 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 .