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Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999

FROM VOLUME 5, NUMBER 12, DECEMBER 1992

PROFESSIONAL PUBLICATIONS...
GENERAL INTEREST--SCIENCE: SULFATE AEROSOLS AND CLIMATE

Item #d92dec22

"Anthropogenic Influence on the Distribution of Tropospheric Sulphate Aerosol," L. Langner (Swed. Meteor. Inst., S-601 75 Norrköping, Swed.), H. Rodhe et al., Nature, 359(6397), 712-716, Oct. 22, 1992.

Uses a global transport-chemistry model to estimate the changes in the distribution of tropospheric sulfate aerosol and deposition of non-seasalt sulfur that have occurred since preindustrial times. The increase in sulfate aerosol concentration is small over the Southern Hemisphere oceans, but reaches a factor of 100 over northern Europe in winter. The rate of formation of new sulfate particles may have doubled since preindustrial times.

Item #d92dec23

"Sulfate Cooling Effect on Climate through In-Cloud Oxidation of Anthropogenic SO2," J. Lelieveld (Atmos. Chem. Div., M. Planck Inst. Chem., POB 3060, D-6500 Mainz, Ger.), J. Heintzenberg, Science, 258(5079), 117-120, Oct. 2, 1992.

Model results suggest that cloud processing of air is important. Aqueous-phase oxidation of SO2 into sulfate and the subsequent release of dry aerosol by cloud evaporation render sulfate a much more efficient scatterer of solar radiation than through gas-phase SO2 oxidation.

Item #d92dec24

Discussion between Kellogg (p. 598), and Charlson et al. (pp. 598-599) on a recent paper, ibid., 256(5057), May 1, 1992.