Why is there a short-term increase in global precipitation in response to diminished CO2 forcing?

Details Why is there a short-term increase in global precipitation in response to diminished CO2 forcing? Why is there a short-term increase in global precipitation in response to diminished CO2 forcing?

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3806703c&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 6, CiteID L06703

Physics

1

Global Change: Abrupt/Rapid Climate Change (4901, 8408), Global Change: Earth System Modeling (1225, 4316), Global Change: Oceans (1616, 3305, 4215, 4513), Global Change: Climate Dynamics (0429, 3309)

Scientific paper

Recently, it was found that a reduction in atmospheric CO2 concentration leads to a temporary increase in global precipitation. We use the Hadley Center coupled atmosphere-ocean model, HadCM3L, to demonstrate that this precipitation increase is a consequence of precipitation sensitivity to changes in atmospheric CO2 concentrations through fast tropospheric adjustment processes. Slow ocean cooling explains the longer-term decrease in precipitation. Increased CO2 tends to suppress evaporation/precipitation whereas increased temperatures tend to increase evaporation/precipitation. When the enhanced CO2 forcing is removed, global precipitation increases temporarily, but this increase is not observed when a similar negative radiative forcing is applied as a reduction of solar intensity. Therefore, transient precipitation increase following a reduction in CO2-radiative forcing is a consequence of the specific character of CO2 forcing and is not a general feature associated with decreases in radiative forcing.

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