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Detailed Reference Information |
Jones, A., Roberts, D.L., Woodage, M.J. and Johnson, C.E. (2001). Indirect sulphate aerosol forcing in a climate model with an interactive sulphur cycle. Journal of Geophysical Research 106: doi: 10.1029/2000JD000089. issn: 0148-0227. |
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The effects of anthropogenic sulphate aerosol on cloud albedo and on precipitation efficiency (the first and second indirect effects, respectively) are investigated using a new version of the Hadley Center climate model. This version includes a new cloud microphysics scheme, an interactive sulphur cycle, and a parameterization of the effects of sea salt aerosol. The combined global mean radiative impact from both indirect effects is estimated to be approximately -1.9 W m-2 in terms of the change in net cloud forcing, with the albedo effect dominating: we obtain values of -1.3 and -0.5 W m-2 for the first and second effects, respectively, when calculated separately. The estimate for the combined effect has at least a factor of 2 uncertainty associated with it: for example, alternative assumptions which affect the concentration of natural background sulphate aerosol reduce the forcing by over 25%, and different parameterizations of the autoconversion of cloud droplets to rainwater can double the forcing. ¿ 2001 American Geophysical Union |
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Abstract |
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Keywords
Atmospheric Composition and Structure, Aerosols and particles (0345, 4801), Atmospheric Composition and Structure, Cloud physics and chemistry, Atmospheric Composition and Structure, Troposphere—constituent transport and chemistry, Global Change, Atmosphere (0315, 0325) |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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