Physical mechanism of long-term drying trend over tropical North Africa

Details Physical mechanism of long-term drying trend over tropical North Africa Physical mechanism of long-term drying trend over tropical North Africa

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3709706k&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 9, CiteID L09706

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2

Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Global Change: Global Climate Models (3337, 4928), Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Global Change: Climate Dynamics (0429, 3309), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513)

Scientific paper

Based on an approximated moisture budget equation, we investigate the physical mechanisms of a drying trend observed over tropical North Africa in the boreal summer during the 20th Century by analyzing datasets of several climate-model experiments forced with various combinations of natural and anthropogenic forcings. Increased anthropogenic aerosols thermodynamically induce a drying trend due to a tropospheric cooling and dynamically induce an additional drying trend due to an atmospheric local circulation change stirred up by the strong gradient of a sea surface temperature anomaly over the tropical Atlantic Ocean. Increased greenhouse gases, on the other hand, induce a drying trend through the large-scale dynamic effect, which is canceled out by the thermodynamically induced moistening trend due to tropospheric warming. Therefore, the drying trend observed over tropical North Africa during the 20th Century is strongly affected by the increased anthropogenic aerosols through both the dynamic and thermodynamic effects.

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