The use of atmospheric cosmogenic S-35 and Be-7 in determining depositional fluxes of SO2

Physics

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Atmospheric Chemistry, Beryllium Isotopes, Nuclear Reactions, Radiochemistry, Sulfur Dioxides, Sulfur Isotopes, Aerosols, Cosmic Rays, Nuclides, Planetary Boundary Layer, Tracers, Troposphere

Scientific paper

The use of two cosmogenically produced nuclides in the atmosphere, S-35 (half-life = 87 days) and Be-7 (half-life = 53 days), as tracers of gaseous SO2 and aerosol SO4 and Be removal processes to the earth's surface is explored. Based on S-35 and Be-7 wet precipitation fluxes and (S-35)O2, (S-35)O4 and Be-7 concentrations in air samples in the planetary boundary layer at New Haven, Connecticut (USA) coefficients for in-cloud scavenging of (S-35)O2, oxidation of (S-35)O2 to (S-35)O4 in both the planetary boundary layer and the free troposphere, and dry deposition are determined. In addition, the distributions of (S-35)O2, (S-35)O4 and Be-7 between the planetary boundary layer and the free troposphere are determined as well as the air exchange coefficient between the two reservoirs. Application to stable S yields a dry deposition flux to total flux ratio of about 0.20 for August, 1990.

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