Singh, S. (2016) Significant cooling effect on the surface due to soot particles over Brahmaputra River Valley region, India: An impact on regional climate. Science of the Total Environment, 562. pp. 504-516.

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Abstract

Black carbon (BC) is an important atmospheric aerosol constituent that affects the climate by absorbing (directly) the sunlight and modifying cloud characteristics (indirectly). Here,we present first time yearlong measurements of BC and carbon monoxide (CO) from an urban location of Guwahati located in the Brahmaputra River valley (BRV) in the northeast region of India from1st July 2013 to 30th June 2014. Daily BC concentrations variedwithin the range of 2.86 to 11.56 μg m−3 with an annual average of 7.17 ± 1.89 μg m−3, while, CO varied from 0.19 to 1.20 ppmwith a mean value of 0.51±0.19 ppmduring the study period. The concentrations of BC (8.37 μgm−3) and CO (0.67 ppm) were ~39% and ~55% higher during the dry months (October toMarch) than the wet months (April to September) suggesting that seasonal changes in meteorology and emission sources play an important role in controlling these species. The seasonal ΔBC/ΔCO ratios were highest (lowest) in the pre-monsoon (winter) 18.1 ± 1.4 μg m−3 ppmv−1 (12.6 ± 2.2 μg m−3 ppmv−1) which indicate the combustion of biofuel/ biomass as well as direct emissions from fossil fuel during the pre-monsoon season. The annual BC emission

Item Type:	Article
Uncontrolled Keywords:	Black carbon Carbon monoxide Radiative impact WRF-chem
Subjects:	Envieronmental Management Group
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	23 Aug 2017 04:50
Last Modified:	23 Aug 2017 04:50
URI:	http://cimfr.csircentral.net/id/eprint/1829

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