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|Satellite observations of the regional aerosol distribution and transport over the Arabian Sea, Bay of Bengal and Indian Ocean
Nair, Sandhya K
Raju, C Suresh
|Aerosols;Regional aerosol distribution;Transport;Satellite observations;AVHRR;Indian Ocean;Arabian Sea;Bay of Bengal;Forest fires
|Int. Cl. ⁷ C09K 3/30, G01B 11/22
|The aerosol optical depth (AOD) derived from the NOAA14-AVHRR data and the tropospheric circulation obtained from the NCEP-NCAR reanalysis were used to study the regional distribution and long-range transport of aerosols over the oceanic areas around the Indian subcontinent during the Asian dry period (November – April) and the southwest monsoon season (June-September). Due to the contrasting airmass types, the aerosol properties over the oceanic areas around the Indian subcontinent are distinctly different during the Asian dry period compared to that during the summer monsoon sea-son. Strikingly, the oceanic areas around the Indian subcontinent in the northern hemisphere in general, and the Arabian Sea in particular are always under the influence of continental aerosols throughout the year, despite the large annual migration of ITCZ and the presence of the vast oceanic areas at the south of the continental areas. The study demonstrates the transport of aerosols from the continental areas in the northern hemisphere to the oceanic region during the Asian dry season and a much larger-scale aerosol transport from the Arabian desert region to the Arabian Sea during the summer monsoon period. Bay of Bengal and the tropical Indian Ocean are significantly influenced by the aerosol transport from the Indian subcontinent and southeast Asia. However, the continental aerosol transport remains more or less confined to the Arabian Sea, Bay of Bengal and northern hemisphere Indian Ocean. Throughout the year, spatial gradient in AOD is large over Arabian Sea and Bay of Bengal, particularly in the meridional direction across ~5ºN to 10ºN. Associated with the El Nino related forest fires in the Indonesian region, a substantially large aerosol plume, with AOD exceeding 1.0, was observed over the tropical Indian Ocean during September-November 1997. The contribution of natural aerosols to the observed AOD during each season, the long-term changes in the aerosol loading, and the interaction between aerosols and clouds further needs to be investigated.
|Appears in Collections:
| IJMS Vol.33(1) [March 2004]
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