Agnihotri, Rajesh and Karapurkar, Supriya G. and Sarma, Vedula V. S. S. and Yadav, Kamana and Kumar, Maripi Dileep and Sharma, Chhemendra and Prasad, M. V. S. N. (2015) Stable Isotopic and Chemical Characteristics of Bulk Aerosols during Winter and Summer Season at a Station in Western Coast of India (Goa). Aerosol and air quality research, 15 (3). 888-900 . ISSN 1680-8584

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Abstract

We measured stable isotopic and chemical characteristics of bulk aerosols collected at a coastal station in western India (Goa) between December 2009 and January 2011, to characterize lower tropospheric atmospheric conditions and their influence on particle chemistry during winter and summer seasons. Marked differences were observed in terms of sources and chemical compositions of bulk aerosols. The delta N-15(TN) values of winter aerosols (10.8 +/- 2.2 parts per thousand, n = 10) indicate biomass burning contributions in the carbonaceous fraction, while significantly depleted delta N-15(TN) values of summer aerosols (6.2 +/- 2.3 parts per thousand, n = 12) hints incorporation of marine N species. The delta S-34(TS) showed depleted values during winter (5.0 +/- 1.0 parts per thousand, n = 10), which closely matched with those of typical urban polluted environments, while summer aerosols showed a systematic enrichment of delta S-34(TS) (up to similar to 14 parts per thousand with average value 9.0 +/- 2.8 parts per thousand, n = 13); possibly due to incorporation of volatile dimethyl sulfide (DMS) and its precursor dimethylsulfoniopropionate (DMSP) emitted from the adjacent Arabian Sea. Likewise, delta C-13(TOC) values showed similar to 2 parts per thousand enrichment in winter aerosols (-24.8 +/- 0.4 parts per thousand, n = 10) with respect to those of summer values, indicating presence of bio-fuel and coal burning contributions in carbonaceous fraction of winter aerosols. We also measured major ions (Na+, K+, Mg++, Ca++, NH4 (+), Cl-, Br-, NO3-, SO4-2) in water soluble fraction of aerosols to understand winter/summer changes in the atmospheric chemistry over this coastal area. This is the first ever dataset on triple isotopic characteristics of bulk aerosols at a coastal location of India showing signatures of continental bio-mass/biofuel burning influences during winter, whereas marine inventories (e.g., sea salt, DMS and mineral dust) appear to dominate chemical composition of summer aerosols.

Item Type:	Article
Uncontrolled Keywords:	Bulk aerosols; Stable isotopes; Coastal environment; Goa.
Subjects:	General Science
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	13 Oct 2016 07:35
Last Modified:	13 Oct 2016 07:35
URI:	http://npl.csircentral.net/id/eprint/1991

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