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|Title:||Seasonality of 7Be concentrations in Europe and influence of tropopause height|
|Authors:||HERNANDEZ CEBALLOS MIGUEL ANGEL; BRATTICH Erika; CINELLI GIORGIA; AJTIĆ Jelena; ĐURĐEVIĆ Vladimir|
|Citation:||TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY vol. 68 p. 29534|
|Type:||Articles in periodicals and books|
|Abstract:||This study aims to analyze the latitudinal variability of both the yearly and seasonal pattern of 7Be surface activity concentrations, to address the impact of tropopause height (TPH) on 7Be distribution and to evaluate the time lag between TPH and 7Be at European level. With this aim, weekly 7Be and daily TPH data at 17 sampling stations during 10 years (2001-2010) are analyzed. 7Be shows a clear inter-annual increasing tendency in all the stations and a general increasing value 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 7Be, having TPH a larger influence on 7Be during summer. The impact of TPH on 7Be 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-central Europe and stations in southern-central Europe. A similar behavior for stations located in the same geographical area is also observed when looking at the day of maximum impact of TPH on 7Be concentrations. The results suggest that 7Be concentrations respond in different times to changes in the TPH, observing seasonal differences in each group. These results represent the first European approach to the understanding the TPH impact on 7Be concentrations at surface levels.|
|JRC Directorate:||Nuclear Safety and Security|
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