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Regional and seasonal variations of the Twomey indirect effect as observed by the ATSR-2 satellite instrument

Abstract:

We use satellite observations of aerosol optical depth τa and cloud effective radius re from the ATSR-2 instrument in 1997 to investigate the Twomey indirect effect (IE, -∂ 1n re/∂ 1n τa ) in regions of continental outflow. We generally find a negative correlation between τa and re, 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, c...

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Publication status:
Published

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Publisher copy:
10.1029/2007GL031394

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Institution:
University of Oxford
Department:
Oxford, MPLS, Physics, Atmos Ocean and Planet Physics
Role:
Author
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Journal:
GEOPHYSICAL RESEARCH LETTERS
Volume:
35
Issue:
2
Publication date:
2008-01-26
DOI:
ISSN:
0094-8276
URN:
uuid:5d176dd8-8b0f-4e57-8808-60142f68c12c
Source identifiers:
20982
Local pid:
pubs:20982
Language:
English

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