Two opposing effects of absorbing aerosols on global-mean precipitation

Details Two opposing effects of absorbing aerosols on global-mean precipitation Two opposing effects of absorbing aerosols on global-mean precipitation

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3713701m&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 13, CiteID L13701

Mathematics

Logic

8

Global Change: Climate Dynamics (0429, 3309), Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Global Change: Global Climate Models (3337, 4928)

Scientific paper

Absorbing aerosols affect global-mean precipitation primarily in two ways. They give rise to stronger shortwave atmospheric heating, which acts to suppress precipitation. Depending on the top-of-the-atmosphere radiative flux change, they can also warm up the surface with a tendency to increase precipitation. Here, we present a theoretical framework that takes into account both effects, and apply it to analyze the hydrological responses to increased black carbon burden simulated with a general circulation model. It is found that the damping effect of atmospheric heating can outweigh the enhancing effect of surface warming, resulting in a net decrease in precipitation. The implications for moist convection and general circulation are discussed.

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