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Detailed Reference Information |
Vinoj, V., Babu, S.S., Satheesh, S.K., Moorthy, K. and Kaufman, Y.J. (2004). Radiative forcing by aerosols over the Bay of Bengal region derived from shipborne, island-based, and satellite (Moderate-Resolution Imaging Spectroradiometer) observations. Journal of Geophysical Research 109: doi: 10.1029/2003JD004329. issn: 0148-0227. |
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Measurements of spectral aerosol optical depths (AODs) were made over the Bay of Bengal region (adjacent to the Indian landmass) on board the oceanographic research vessel Sagar Kanya during February 2003. Simultaneous measurements of spectral AODs and mass concentrations of the composite aerosols and aerosol black carbon (BC) were made at an island location, Port Blair (11.63¿N, 92.71¿E), also in the Bay of Bengal. At the cruise locations the AODs were in the range of ~0.3--0.6 at 500 nm (with a mean value of 0.41 ¿ 0.14) and Angstrom wavelength exponent of ~1.1 ¿ 0.1; while at Port Blair the AODs were in the range of 0.11--0.48 at 500 nm and Angstrom wavelength exponent of 0.98 ¿ 0.07. Aerosol BC constituted 5.8 ¿ 0.6% of the composite aerosol mass concentration with a single-scattering albedo of ~0.88, indicating the presence of a significant amount of submicron absorbing aerosols. Comparisons of AODs measured at Port Blair during cruise 188 and an earlier cruise (cruise 161B) during March 2001 (over the Bay of Bengal, Arabian Sea, and Indian Ocean) with those derived from Moderate-Resolution Imaging Spectroradiometer (MODIS) (on board the TERRA platform) showed excellent agreement with a mean difference of ~0.01 and a root-mean-square difference of ~0.03. Regionally averaged aerosol (net) forcing over the Bay of Bengal was in the range -15 to -24 W m-2 at the surface and -2 to -4 W m-2 at the top of the atmosphere in February 2003; these values were smaller in magnitude than those observed over this region during March 2001 and larger than that observed over the Arabian Sea and the Indian Ocean. The resulting atmospheric heating due to aerosol absorption was ~0.5¿K/d. |
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BACKGROUND DATA FILES |
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Abstract |
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Keywords
Atmospheric Composition and Structure, Aerosols and particles (0345, 4801), Atmospheric Composition and Structure, Pollution—urban and regional, Global Change, Remote sensing, Global Change, Atmosphere (0315, 0325), Hydrology, Anthropogenic effects, aerosols, radiative forcing, atmosphere |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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