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Day and night variability of atmospheric organic and elemental carbon during winter of 2011-12 in Agra, India

Pipal, AS and Jan, R and Bisht, DS and Srivastava, AK and Tiwari, S and Taneja, A (2014) Day and night variability of atmospheric organic and elemental carbon during winter of 2011-12 in Agra, India. Sustainable Environment Research, 24 (2). pp. 107-116.

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Abstract

The mass concentrations of organic carbon and elemental carbon (OC and EC) associated with PM2.5 were investigated at a traffic influenced site (roadside) Kandhari, U.P. India during winter of 2011-12 by semi-continuous carbon analyzer. Individual samples of PM2.5 were collected for different time periods i.e., 24-h, day and night by medium volume air sampler and analyzed for OC and EC using thermal optical transmittance protocol. Average mass concentration of PM2.5was 183 ± 114 μg m-3 and varied from 29 to 612 μg m-3. Carbonaceous analysis results showed that the average concentration of OC varied from 39 to 96 μg m-3 for 24-h, 71 to 89 μg m-3 for day and 64-91 μg m-3 for night while EC varied from 3.4-9.3, 8.9-16.8, 12.4-18.2 μg m-3 for 24-h, day and night samples respectively. The OC/EC was estimated which varied between 4.9-47, suggesting the presence of secondary organic aerosol. Carbonaceous aerosol account for 43 of the total PM2.5 mass in which the 38 OC and 5 EC contributed to total PM2.5 concentration. Day and night variation of carbonaceous aerosol was also studied and was found that the relative abundance of OC and EC was higher during day time. The high concentration of PM2.5 and its associated carbonaceous aerosol species at this site may be due to vehicular activities, biomass and fossil fuel combustion. Strong correlation between OC, EC and PM2.5 (r = 0.83-0.97) was observed for 24-h samples. Average level of secondary' organic carbon was 46 μg m-3 for 24-h, 27 μg m-3 for day and 35 μg m-3 for night, accounting for 73, 34 and 46 for 24-h, day and night samples of total OC, respectively. This indicates that the source of OC is from primary emissions as well as secondary emissions in this region.

Item Type: Article
Uncontrolled Keywords: PM2.5, carbonaceous aerosols, secondary organic aerosol, black carbon, India
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 27 Nov 2014 10:02
Last Modified: 27 Nov 2014 10:02
URI: http://moeseprints.incois.gov.in/id/eprint/974

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