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Inferring aerosol types over the Indo-Gangetic Basin from ground based sunphotometer measurements

Srivastava, AK and Tripathi, SN and Dey, S and Kanawade, VP and Tiwari, S (2012) Inferring aerosol types over the Indo-Gangetic Basin from ground based sunphotometer measurements. Atmospheric Research, 109-11. pp. 64-75.

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Abstract

A discrimination of aerosol types over the Indo-Gangetic Basin (IGB) region during pre-monsoon period was made using multi-year ground based sun/sky radiometer measured aerosol products associated with the size of aerosols and radiation absorptivity. High dust enriched aerosols (i.e. polluted dust, PD) were found to contribute more over the central IGB station at Kanpur (KNP, 62) as compared to the eastern IGB station at Gandhi College (GC, 31) whereas vice-versa was observed for polluted continental (PC) aerosols, which contain high anthropogenic and less dust aerosols. Contributions of carbonaceous particles having high absorbing (mostly black carbon, MBC) and low absorbing (mostly organic carbon, MOC) aerosols were found to be 11 and 10, respectively at GC, which was ~. 46 and 62 higher than the observed contributions at KNP; however, very less contribution of non-absorbing (NA) aerosols was observed only at GC (2). Variability in aerosol types together with single scattering albedo (SSA) at both the stations were also studied during the forenoon (FN) and afternoon (AN) hour, which suggests their strong association with emission sources. Results were well substantiated with the air mass back-trajectories and the fire products. Spectral information of SSA for each aerosol type discriminates the dominance of natural dust (SSA increases with increasing wavelength) with anthropogenic aerosols (SSA decreases with increasing wavelength) at both the locations. The estimated absorption à ngström exponent (AAE) values suggest relative dominance of absorbing type aerosols over the central part of IGB (due to dominant dust absorption) as compared to the eastern part during pre-monsoon period.

Item Type: Article
Additional Information: Copyright of this article belongs to Elsevier.
Uncontrolled Keywords: Absorptivities; Aerosol product; Aerosol types; Air mass; Anthropogenic aerosols; Black carbon; Carbonaceous particles; Dust absorption; Dust aerosols; Emission sources; Fine mode fraction; Fire products; Ground based; Indo-Gangetic basin; Pre-monsoon; Single scattering albedo; Spectral information; Sun photometers, Atmospheric thermodynamics; Dust; Number theory; Solar radiation, Atmospheric aerosols, aerosol; albedo; ground-based measurement; optical property; particle size; photometer; radiometer, Gangetic Plain
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 25 Dec 2013 07:53
Last Modified: 25 Dec 2013 07:53
URI: http://moeseprints.incois.gov.in/id/eprint/495

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