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Aerosol black carbon over Arabian Sea during intermonsoon and summer monsoon seasons

Babu, Suresh S and Moorthy, Krishna K and Satheesh, SK (2004) Aerosol black carbon over Arabian Sea during intermonsoon and summer monsoon seasons. In: Geophysical Research Letters, 31 (6).

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Official URL: http://www.agu.org/pubs/crossref/2004/2003GL018716...


Extensive, collocated measurements of the mass concentrations of composite and black carbon (BC) aerosols were made over coastal Arabian Sea, adjoining Indian Peninsula, for the first time during the inter-monsoon and summer monsoon periods, of 2003, as part of Arabian Sea Monsoon Experiment (ARMEX). Results showed that the diurnal variations are weak in March, and vanish completely by May/June, associated with the change in the synoptic circulations. The concentration of BC (and its share to total aerosol mass) decreases continuously, from similar to700 ng m(-3) (2.5%) in March to similar to104 ng m(-3) (0.5%) by June. Consequently, the net atmospheric forcing (heating) efficiency decreases from similar to70 W m(-2) (for reported winter conditions) to similar to30 W m(-2) for inter-monsoon and to similar to15 W m(-2) for summer monsoon seasons. These will have implications on regional climate forcing.

Item Type: Journal Article
Additional Information: copyright of this article belongs to American Geographcal Union
Keywords: Indian-Ocean experiment;Long-rang transport;Optical Properties;Marine Atmoshphere;Soot carbon;Size;Absoption;Origin.
Department/Centre: Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Depositing User: Rajalaxmi Ashok Govanakoppa
Date Deposited: 03 Dec 2008 05:59
Last Modified: 03 Dec 2008 05:59
URI: http://eprints.iisc.ac.in/id/eprint/16557

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