44
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2XC02 - IXC02 SEA LEVEL ~~ (tf!-lOOJJ
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Figure 2.7: Doubled CO2 minus current climate annual mean differences in total cloud cover
(top) and sea level pressure (bottom) simulated by the GISS GCM.
tal air may often have sufficient numbers of CCN to nucleate clouds with maximum efficiency,
so that an increase in aerosol has no effect on cloud droplet size. Marine air, on the other hand,
is deficient in CCN, and thus oceanic clouds are more susceptible to aerosol changes (Platnick