Variability of atmospheric carbonyl sulfide at a semi-arid urban site in western India

Show simple item record Mallika, Chinmay Chandra, Naveen Venkataramani, S. Lal, Shyam 2016-04-15T13:45:28Z 2016-04-15T13:45:28Z 2016-05
dc.identifier.citation Mallika, Chinmay; Chandra, Naveen; Venkataramania, S. and Lala, Shyam, “Variability of atmospheric carbonyl sulfide at a semi-arid urban site in western India”, Science of The Total Environment, DOI: 10.1016/j.scitotenv.2016.02.014, vol. 551–552, pp. 725–737, May 2016. en_US
dc.identifier.issn 0048-9697
dc.description.abstract Atmospheric carbonyl sulfide (COS) is a major precursor for sulfate aerosols that play a critical role in climate regulation. Recent studies have highlighted the importance of COS measurements as a reliable means to constrain biospheric carbon assimilation. In a scenario of limited availability of COS data around the globe, we present gas-chromatographic measurements of atmospheric COS mixing ratios over Ahmedabad, a semi-arid, urban region in western India. These measurements, being reported for the first time over an Indian site, enable us to understand the diurnal and seasonal variation in atmospheric COS with respect to its natural, anthropogenic and photochemical sources and sinks. The annual mean COS mixing ratio over Ahmedabad is found to be 0.83 ± 0.43 ppbv, which is substantially higher than free tropospheric values for the northern hemisphere. Inverse correlation of COS with soil and skin temperature, suggests that the dry soil of the semi-arid study region is a potential sink for atmospheric COS. Positive correlations of COS with NO2 and CO during post-monsoon and the COS/CO slope of 0.78 pptv/ppbv reveals influence of diesel combustion and tire wear. The highest concentrations of COS are observed during pre-monsoon; COS/CO2 slope of 44.75 pptv/ppmv combined with information from air mass back-trajectories reveal marshy wetlands spanning over 7500 km2 as an important source of COS in Ahmedabad. COS/CO2 slopes decrease drastically (8.28 pptv/ppmv) during post-monsoon due to combined impact of biospheric uptake and anthropogenic emissions. en_US
dc.description.statementofresponsibility by Chinmay Mallika
dc.format.extent vol. 551–552, pp. 725–737
dc.language.iso en_US en_US
dc.publisher Elsevier en_US
dc.subject Carbonyl sulfide en_US
dc.subject Natural sinks en_US
dc.subject Anthropogenic sources en_US
dc.subject Biosphere en_US
dc.subject COS/CO2 slopes en_US
dc.title Variability of atmospheric carbonyl sulfide at a semi-arid urban site in western India en_US
dc.type Article en_US
dc.relation.journal Science of The Total Environment

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