Solar forcing on the 7Be-air concentration variability at ground level

This paper analyzes the correlation between the temporal and spatial variability of 7Be-air concentration at ground level to precipitation. Data, obtained from 26 stations distributed throughout North and South America, Australia and Antarctica, were analyzed. Variations in the data were extracted by the empirical orthogonal function (EOF) and principal component (PC) analysis. The results presented here show that the variability of 7Be-air concentration at ground level is influenced simultaneously both by solar cycle and atmospheric processes, such as precipitation, turbulent transport and advection. Solar forcing dominates 7Be annual variability worldwide. On the other hand, atmospheric processes influence 7Be air-concentration at ground level regionally and seasonally.