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|Title:||Carbonaceous aerosols at a suburban site in Indo-Gangetic plain|
Kumari, K Maharaj
|Keywords:||Carbonaceous aerosol;Organic carbon;Black carbon;OC/BC ratio;Total suspended particulate mass (TSPM)|
|Abstract:||Carbonaceous aerosols are emitted by combustion sources and may influence the climate by altering the radiation balance of the atmosphere. The carbonaceous component of the atmospheric aerosols is composed of two main fractions, viz. organic carbon (OC) and black carbon (BC). BC is emitted from the incomplete combustion while OC comes from the primary emission such as traffic exhaust and biomass burning and is also formed through atmospheric chemical conversion processes. Carbonaceous aerosols were monitored at a suburban site, Dayalbagh, Agra from January to October 2009 in the present study. It was found that total suspended particulate mass (TSPM) varied from 79 to 658 g m-3 with an average of 273±179.9 g m-3. Also, daily concentrations of OC and BC ranged from 20.4 to 147.4 g m-3 and from 1.4 to 20.3 g m-3 with the overall average concentrations of 60.9±40.5 g m-3 and 7.5±4.6 g m-3, respectively. OC/BC ratios indicate the emission sources of carbonaceous aerosols. When the OC/BC ratio exceeds 2.0, it indicates that carbonaceous aerosols mainly originate from secondary organic transformation. Daily average OC/BC ratio varied between 5.2 and 16.2 with an average of 8.1. To give an insight into the source contribution of OC and BC, correlation coefficient was determined. The correlation coefficient is found to be 0.79. This indicates that major fraction of OC and BC originates from a common source. Distinct monthly variation was observed in their concentrations.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.39(4) [August 2010]|
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