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Characterization of carbonaceous aerosols over the urban tropical location and a new approach to evaluate their climatic importance

Safai, PD and Raju, MP and Rao, PSP and Pandithurai, G (2014) Characterization of carbonaceous aerosols over the urban tropical location and a new approach to evaluate their climatic importance. Atmospheric Environment, 92. pp. 493-500.

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Increasing emissions from fossil-fuel, biomass burning, land use changes and industrial growth have led to rapid increase in the atmospheric concentrations of carbonaceous species over many cities in India. The present paper deals with the results obtained from year long (2012-13) observations conducted at a tropical urban location, Pune in southwestern India on Organic and Elemental Carbon as well as Black Carbon; using the Sunset OCEC Analyzer and Aethalometer, respectively. The average mass concentrations of OC and EC were in the order of winter>post-monsoon>summer>monsoon. Mean annual OC/EC ratio was found to be 2.4±1.1 during the study period, suggesting the presence of secondary organic carbon (SOC). Estimated SOC was found to form 47 of OC mass concentration. OC and EC were also significantly well correlated (r=0.95, p<0.0001) to each other, indicating towards common combustion sources. The primary organic carbon (POC) dominated over SOC and EC in post-monsoon and winter seasons indicating impact of anthropogenic burning activity, enhanced by prevailing meteorological conditions as well as that of long range transport. Mean annual POC+EC/TC ratio was 0.69 indicating that more than 2/3 of TC is formed from combustion sources. Thermally derived EC and optically derived BC correlated very well (r=0.98, p<0.0001). A new concept e.g. Effective carbon ratio (ECR) is suggested to better assess the scattering/absorptive nature and probable source identification of carbonaceous aerosols in place of conventional OC/EC ratio.

Item Type: Article
Additional Information: Copyright of this article belongs to Elsevier.
Uncontrolled Keywords: Aerosols; Atmospheric thermodynamics; Carbon; Combustion; Industrial emissions; Organic carbon, Atmospheric concentration; Carbon ratio; Meteorological condition; OC/EC ratio; Organic and elemental carbon; Primary organic carbons; Secondary organic carbon; Secondary organic carbons (SOC), Atmospheric movements, black carbon; carbon; fossil fuel; hydrogen; nitrogen; organic carbon; oxygen, air sampling; article; atmosphere; boundary layer; burn; climate; combustion; controlled study; dry deposition; environmental temperature; India; meteorology; methodology; molecular weight; observational study; photooxidation; primary organic aerosol; priority journal; seasonal variation; secondary organic aerosol; summer; tropics; urban area; wet deposition; winter
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 28 Nov 2014 04:50
Last Modified: 28 Nov 2014 04:50

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