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Short wave versus long wave radiative forcing by Indian Ocean aerosols: Role of sea-surface winds

Satheesh, SK and Lubin, D (2003) Short wave versus long wave radiative forcing by Indian Ocean aerosols: Role of sea-surface winds. In: Geophysical Research Letters, 30 (13). p. 1695.

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Recent observations over the Indian Ocean have demonstrated aerosol short wave absorption as high as 20 to 25 W $m^{-2}$. The aerosol net radiative forcing reduces substantially while considering the broad spectrum including the long wave region (due to large infrared forcing which is opposite in sign). At high winds, presence of large amounts of sea-salt aerosols (absorbing in infrared) enhances the infrared forcing; hence reduces the net radiative forcing. We examine the role of sea-surface winds (which enhance sea-salt aerosols) on long wave aerosol forcing. Even at moderate winds $(6-10 m s^{-1})$, the short wave forcing reduces by 45% due to the dominance of sea-salt aerosols. At high winds $(>10 m s^{-1})$, a major fraction of the long wave forcing is contributed by sea-salt (more than 70%). Our studies show that neglecting aerosol long wave radiative forcing can cause large errors in climate models.

Item Type: Journal Article
Publication: Geophysical Research Letters
Publisher: American Geophysical Union
Additional Information: Copyright of this article belongs to American Geophysical Union.
Department/Centre: Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited: 23 Aug 2007
Last Modified: 09 Jan 2012 09:41
URI: http://eprints.iisc.ac.in/id/eprint/10742

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