Srivastava, A. K. and Yadav, V. and Pathak, V. and Singh, Sachchidanand and Tiwari, S. and Bisht, D. S. and Goloub, P. (2014) Variability in radiative properties of major aerosol types: A year-long study over Delhi An urban station in Indo-Gangetic Basin. Science of the Total Environment, 473. 659-666. ISSN 0048-9697

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Abstract

Aerosol measurements over an urban site at Delhi in the western Ganga basin, northern India, were carried out during 2009 using a ground-based automatic sun/sky radiometer to identify their different types and to understand their possible radiative implications. Differentiation of aerosol types over the station was made using the appropriate thresholds for size-distribution of aerosols (i.e. fine-mode fraction, FMF at 500 nm) and radiation absorptivity (i.e. single scattering albedo, SSA at 440 nm). Four different aerosol types were identified, viz., polluted dust (PD), polluted continent (PC), mostly black carbon (MBC) and mostly organic carbon (MOC), which contributed similar to 48%, 32%, 11% and 9%, respectively to the total aerosols. Interestingly, the optical properties for these aerosol types differed considerably, which were further used, for the first time, to quantify their radiative implications over this station. The highest atmospheric forcing was observed for PC aerosol type (about +40 W m(-2), along with the corresponding atmospheric heating rate of 1.10 K day(-1)); whereas the lowest was for MBC aerosol type (about +25 W m(-2), along with the corresponding atmospheric heating rate of 0.69 K day(-1)).

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/S Elsevier.
Uncontrolled Keywords:	Aerosol types Indo-Gangetic Basin Optical properties Radiative forcing Heating rate
Subjects:	Meteorology & Atmospheric Sciences
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	23 Nov 2015 11:09
Last Modified:	23 Nov 2015 11:09
URI:	http://npl.csircentral.net/id/eprint/1642

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