Continental influence on the spatial distribution of particulate loading over the Indian Ocean during winter season

Details Continental influence on the spatial distribution of particulate loading over the Indian Ocean during winter season Continental influence on the spatial distribution of particulate loading over the Indian Ocean during winter season

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66...27n&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 1, p. 27-38.

Physics

7

Aerosol Mass Concentration, Itcz, Non-Sea-Salt Aerosols, Sea-Spray, Continental Advection, Indian Ocean Experiment

Scientific paper

Advection of continental aerosols over to the Arabian Sea and Indian Ocean regions during winter (when the prevailing synoptic wind is north-easterly) has been studied by examining the spatial distribution of the near-surface aerosol mass concentration (MC). In the northern part of Arabian Sea and north of the inter-tropical convergence zone (ITCZ) MC is significantly larger than that in the southern side of ITCZ. A prominent high in MC is observed near the mid-Arabian Sea region ~12° to 15°N. Associated with local convergences introduced by mesoscale weather systems, pockets of high MC are observed at different locations over the oceanic regions. Significantly low values of MC are observed in the ITCZ. Surface streamlines and wind patterns indicate advection of continental aerosols from the adjoining landmass over to the oceanic environment. Aerosol mass concentration in the far oceanic region is also influenced by in situ production of sea-spray aerosols, which depends on wind speed. The nature of advection of continental aerosols has been studied by separating the wind-induced component of MC and chemical nature of the aerosols. The spatial variation of the wind-independent component matches well with that of the non-sea-salt aerosols estimated from chemical composition.

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