Variation between near-surface and columnar aerosol characteristics during the winter and summer at Delhi in the Indo-Gangetic Basin

Details Variation between near-surface and columnar aerosol characteristics during the winter and summer at Delhi in the Indo-Gangetic Basin Variation between near-surface and columnar aerosol characteristics during the winter and summer at Delhi in the Indo-Gangetic Basin

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jastp..77...57s&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 77, p. 57-66.

Physics

1

Scientific paper

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 ˜200 (±24) and 118 (±33) μg m-3, respectively, during the winter and ˜168 (±31) and 55 (±12) μg 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 Reff value (0.63±0.05 μm) and coarse-particle mass concentrations during the summer, having large Reff value (1.52±0.60 μm). The concurrent measurement of columnar aerosol optical depth (AOD) showed high values (>0.60 at 500 nm) during both the periods. The Ångström exponent (α) over the station, however, also suggests relatively large contribution of fine-mode particles during the winter (α˜1.02) and coarse-mode dust particles during the summer (α˜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.

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