We measured stable isotopic and chemical characteristics of bulk aerosols collected at a coastal ... more 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. 15NTN values of winter aerosols (10.8±2.2‰, n=10) indicate biomass burning contributions in the carbonaceous fraction, while significantly depleted 15NTN of summer aerosols (6.2±2.3‰, n=12) hints incorporation of marine N species. 34STS showed depleted values during winter (5.0±1.0‰, n=10) and closely matching with that of typical urban polluted environments, while summer aerosols show a systematic enrichment of 34STS (up to ~14‰ with average value 9.0±2.8‰, n=13); possibly due to incorporation of dimethyl sulfide (DMS) emitting from adjacent Arabian Sea. Likewise, 13CTOC values show ~2‰ enrichment in winter aerosols (-24.8±0.4‰, n=10) with respect to those of summer values, indicating presence of bio-fuel (and coal) burning contributions in carbonaceous fraction of aerosols in winter. 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/bio-fuel burning influences during winter, whereas marine inventories (e.g. sea salt, DMS and mineral dust) appear to dominate chemical composition of summer aerosols.
We measured stable isotopic and chemical characteristics of bulk aerosols collected at a coastal ... more 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. 15NTN values of winter aerosols (10.8±2.2‰, n=10) indicate biomass burning contributions in the carbonaceous fraction, while significantly depleted 15NTN of summer aerosols (6.2±2.3‰, n=12) hints incorporation of marine N species. 34STS showed depleted values during winter (5.0±1.0‰, n=10) and closely matching with that of typical urban polluted environments, while summer aerosols show a systematic enrichment of 34STS (up to ~14‰ with average value 9.0±2.8‰, n=13); possibly due to incorporation of dimethyl sulfide (DMS) emitting from adjacent Arabian Sea. Likewise, 13CTOC values show ~2‰ enrichment in winter aerosols (-24.8±0.4‰, n=10) with respect to those of summer values, indicating presence of bio-fuel (and coal) burning contributions in carbonaceous fraction of aerosols in winter. 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/bio-fuel burning influences during winter, whereas marine inventories (e.g. sea salt, DMS and mineral dust) appear to dominate chemical composition of summer aerosols.
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Papers by V.V.S.S. Sarma