M. Wahlen, B. Kothari, J. Mitchell, C. Schwenker, Center for Laboratories and Research, NY State Dept. of Health, Albany NY

D. Elmore, University of Rochester

R. Leifer, DOE NY NY

Concentrations of 7Be and 10Be were measured in filter samples of stratospheric air from different latitudes and altitudes, and in precipitation collected continuously for 434 days at Mohonk Lake, NY (43 degrees N). Average stratospheric Be isotope inventories are deduced from the data and the average 10Be/7Be ratio of 2.6 imply a stratospheric residence time of 320 days, and stratospheric production rates of 0.024 and 0.048 atoms cm^-2 sec^-1 for 10Be and 7Be. The precipitation data show variations in the total deposition and isotope ratios with time. Increased deposition was observed for spring 1982 and 1983. The observed fluxes, normalized to the long term precipitation rate. are 0.063 and 0.033 atoms cm^-2 sec^-1 for 10Be and 7Be, with an average ratio of 1.9. Resulting estimates for global average deposition rates are 0.039 and 0.033 atoms cm^-2 sec^-1. The tropospheric balance for the Be isotopes obtained from the combination of the air and precipation data yields a tropospheric residence time of about 15 days and tropospheric production rates of 0.015 (10Be) and 0.030 atoms cm^-2 see^-1 (7Be). Finally, differences in high altitude stratospheric air concentrations between samples from 1978 (65øN) [Raisbeck et a1., 1981] and our samples from 1982 (61 degrees N) are attributed to the difference in solar modulation.