February 28, 2007
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FROM VOLUME 5, NUMBER 12, DECEMBER 1992
GENERAL INTEREST--SCIENCE: SULFATE AEROSOLS AND CLIMATE
"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,
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.
"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.
Discussion between Kellogg (p. 598), and Charlson et al. (pp. 598-599) on
a recent paper, ibid., 256(5057), May 1, 1992.
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