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13C- And 14C-based study of sources and atmospheric processing of water-soluble organic carbon (WSOC) in South Asian aerosols

Kirillova, EN and Andersson, A and Sheesley, RJ and Krusa, M and Praveen, PS and Budhavant, K and Safai, PD and Rao, PSP and Gustafsson, O (2013) 13C- And 14C-based study of sources and atmospheric processing of water-soluble organic carbon (WSOC) in South Asian aerosols. Journal of Geophysical Research D: Atmospheres, 118 (2). pp. 614-626.

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Water-soluble organic carbon (WSOC) is typically a large component of carbonaceous aerosols with a high propensity for inducing cloud formation. The sources of WSOC, which may be both of primary and secondary origins, are in general poorly constrained. This study assesses the concentrations and dual-carbon isotope (14C and 13C) signatures of South Asian WSOC during a 15-month continuous campaign in 2008–2009. Total suspended particulate matter samples were collected at Sinhagad (SINH) India and at the Maldives Climate Observatory at Hanimaadhoo (MCOH). Monsoon-driven meteorology yields significant WSOC concentration differences between the dry winter season (0.94 ± 0.43 µg m−3 MCOH and 3.6 ± 2.3 µg m−3 SINH) and the summer monsoon season (0.10 ± 0.04 µg m−3 MCOH and 0.35 ± 0.21 µg m−3 SINH). Radiocarbon-based source apportionment of WSOC not only shows the dominance of biogenic/biomass combustion sources but also a substantial anthropogenic fossil-fuel contribution (17 ± 4% MCOH and 23 ± 4% SINH). Aerosols reaching MCOH after long-range over-ocean transport were enriched by 3–4‰ in δ13C-WSOC relative to SINH. This is consistent with particle-phase aging processes influencing the δ13C-WSOC signal in the South Asian regional receptor atmosphere

Item Type: Article
Additional Information: Copyright of this article belongs to American Geophysical Union.
Uncontrolled Keywords: Carbonaceous aerosol; Cloud formation; Combustion sources; Large components; Source apportionment; Summer monsoon; Total suspended particulate matters; Water-soluble organic carbon, Atmospheric thermodynamics; Isotopes, Atmospheric aerosols, aerosol composition; anthropogenic source; carbon isotope; combustion; concentration (composition); fossil fuel; observatory; organic carbon; suspended particulate matter, Hanimaadhoo; Maldives
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 10 Jun 2014 10:09
Last Modified: 10 Jun 2014 10:09

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