Srivastava, A. K. and Singh, Sachchidanand and Tiwari, S. and Kanawade, V. P. and Bisht, D. S. (2012) Variation between near-surface and columnar aerosol characteristics during the winter and summer at Delhi in the Indo-Gangetic Basin. Journal of Atmospheric and Solar-Terrestrial Physics , 77. 57-66. ISSN 1364-6826

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Abstract

Aerosol characteristics were studied over Delhi, a typical urban station in the Ganga basin in Northern India, during two contrasting weather conditions: winter and summer, to explain the changes in columnar and surface aerosol characteristics with the help of ground based measurements and CALIPSO satellite data. The near-surface mean aerosol mass concentrations of PM10 and PM2.5 (+/- standard deviation) were observed to be similar to 200 (+/- 24) and 118 (+/- 33) mu g m(-3), respectively, during the winter and similar to 168 (+/- 31) and 55 (+/- 12) mu g m(-3), respectively, during the summer. PM2.5 was found to be about two times higher than the PM10 concentration during the winter period. Aerosol mass size distribution showed bi-modal nature during both the periods, with relative dominance of fine-particle mass concentrations during the winter, having low R-eff value (0.63 +/- 0.05 mu m) and coarse-particle mass concentrations during the summer, having large R-eff value (1.52 +/- 0.60 mu m). The concurrent measurement of columnar aerosol optical depth (AOD) showed high values (> 0.60 at 500 nm) during both the periods. The Angstrom exponent (alpha) over the station, however, also suggests relatively large contribution of fine-mode particles during the winter (alpha similar to 1.02) and coarse-mode dust particles during the summer (alpha similar to 0.51). The observed features in the surface and columnar measured aerosol characteristics during two different seasons are explained using the vertical winds coupled with the vertical profile of aerosols.

Item Type:	Article
Additional Information:	copyright for this article belongs to M/s Elsevier
Subjects:	Geochemistry/ Geophysics Meteorology & Atmospheric Sciences
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	19 Aug 2026 10:42
Last Modified:	19 Aug 2026 10:42
URI:	https://npl.csircentral.net/id/eprint/3348

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