Atmospheric depositional fluxes of7Be and210Pb at Galveston and College Station, Texas
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The annual depositional fluxes of7Be and210Pb at Galveston during this period varied by a factor of about 2.5, between 8.9 and 23.2 disintegrations per minute (dpm) cm-2yr-1with a mean of 14.7 dpm cm-2yr-1for7Be, and 0.67 and 1.71 dpm cm-2yr-1, with a mean of 1.03 dpm cm-2yr-1for210Pb, respectively, The precipitation-normalized7Be flux increases with increasing amount of precipitation. There is no systematic and consistent seasonal trend in the depositional fluxes for7Be or for210Pb. The volume-weighted210Pb concentrations, when normalized to the amount of precipitation, seem to be constant over the time period of this study. Four to six heavy rain events (>5 cm) in a single day account for 20-30% of the annual deposition of7Be and210Pb. Such events account, however, for only about 4-6% of the total number of rainy days in a year. The dry depositional fluxes of these nuclides appear to be a significant fraction of the bulk depositional flux only during the months when there is very little rain. The fraction of dry to total depositional flux of210Pb appears to be higher than that of7Be. -from Authors
author list (cited authors)
Baskaran, M., Coleman, C. H., & Santschi, P. H.