Physics
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3502811b&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 2, CiteID L02811
Physics
10
Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Cloud/Radiation Interaction
Scientific paper
We use satellite observations of aerosol optical depth τ a and cloud effective radius r e from the ATSR-2 instrument in 1997 to investigate the Twomey indirect effect (IE, -∂ ln r e /∂ ln τ a ) in regions of continental outflow. We generally find a negative correlation between τ a and r e , with the strongest inverse relationships downwind of Africa. North American and eastern Asian continental outflow exhibits a strong seasonal dependence, as expected. Global values for IE range from 0.10 to 0.16, consistent with theoretical predictions. Downwind of Africa, we find that the IE is unphysically high but robust (r = -0.85) during JJA associated with high aerosol loading, and attribute this tentatively to the Twomey hypothesis accounting only for a limited number of physical properties of aerosols.
Arnold Christopher P. G.
Bulgin Claire E.
Campmany Elies
Carboni Elisa
Grainger Roy G.
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