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Variability in radiative properties of major aerosol types: A year-long study over Delhi-An urban station in Indo-Gangetic basin

Srivastava, AK and Yadav, V and Pathak, V and Singh, S and Tiwari, S and Bisht, DS 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, 437-47. pp. 659-666.

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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 ~ 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 of this article belongs to Elsevier
Uncontrolled Keywords: Aerosol types; Indo-Gangetic Basin; Optical properties; Radiative forcing; Heating rate
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 10 Aug 2015 09:49
Last Modified: 10 Aug 2015 09:49
URI: http://moeseprints.incois.gov.in/id/eprint/2827

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