1. Meteorological Factors Controlling 7 Be Activity Concentrations in the Atmospheric Surface Layer in Northern Spain.
- Author
-
Alegría, Natalia, Hernández-Ceballos, Miguel Ángel, Herranz, Margarita, Idoeta, Raquel, and Legarda, Fernando
- Subjects
ATMOSPHERIC layers ,TIME series analysis ,SOLAR cycle ,AIR flow ,HUMIDITY - Abstract
This work presents the analysis of weekly
7 Be activity concentrations in the air measured in Bilbao (northern Spain) by collecting aerosols in filters over a ten years period (2009–2018).7 Be level is in the 0.35–7.3 mBq/m3 range, with a mean of 3.20 ± 1.12 mBq/m3 . The trend, cycle, seasonal and monthly variability are evaluated using time series analysis techniques. The results indicate the impact of sunspots (24th solar cycle) on interannual7 Be activity concentrations, and a significant seasonal and monthly variation, with maximum concentrations occurring in spring-summer and minimum in the winter. The correlation of different7 Be ranges with local meteorological parameters, such as precipitation, temperature, relative humidity, and pressure, is also addressed, with precipitation having the greatest impact on7 Be activity values. The analysis of synoptic airflows, by calculating the back-trajectory clusters, and local winds at surface level reveals the important influence of the arrival of slow northwest Atlantic flows and the development of breezes on reaching high7 Be activity concentrations in this area. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF