12 years of ~7Be and ~(210)Pb in Mt. Cimone, and their correlation with meteorological parameters

摘要

Simultaneous measurements of airborne radionuclides Be and ~(210)Pb, together with aerosol mass load PM_(10), have been routinely carried out at the Global WM0-GAW station of Mt. Cimone (Italy, 2165 m a.s.l., 44° 12' N, 10° 42' E) from 1998 to 2011. The experimental activity was started with the purpose of gaining a better understanding of the vertical and horizontal transports taking place at this site affecting the atmospheric chemical composition. The time series of the collected data is presented and discussed in this paper. The ~7Be concentrations in this period are in the range 0.05-15.8 mBq m ~3 with the presence of two distinct relative maxima during winter/spring and summer, suggesting an origin from different physical processes. The ~(210)Pb concentrations collected during the period are in the range 0.05-2.30 mBq m~(-3) and are characterized by a single maximum during the warm period. The ~7Be/~(210)Pb ratio was in the range 0.5-127.8 and is characterized by a maximum during the cold period. The frequency distributions of the three parameters and the seasonal/interannual variabilities are investigated and presented.