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Aerosolcloud semidirect effect and landsea
temperature contrast in a GCM
R. J. Allen1
and S. C. Sherwood2
Received 5 February 2010; revised 1 March 2010; accepted 4 March 2010; published 2 April 2010.
[1] Simulations with the CAM3 climate model show that
prescribed heating by anthropogenic aerosols significantly
affects cloud cover. Globally the dominant effect is a
decrease in midlevel clouds, which contributes to a semi
direct effect (SDE) that warms the surface by 0.5 W m-2
.
The SDE negates some of the impact of absorbing aerosol
on surface fluxes, up to 50% over the Northern Hemisphere
extratropical (NHE) land during JJA. The SDEnot direct
effectsdrives NHE JJA warming and a landsea contrast in
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