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Characteristics, seasonality and sources of carbonaceous and ionic components in the tropical aerosols from Indian region


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タイトル: Characteristics, seasonality and sources of carbonaceous and ionic components in the tropical aerosols from Indian region
著者: Pavuluri, C. M. 著作を一覧する
Kawamura, K. 著作を一覧する
Aggarwal, S. G. 著作を一覧する
Swaminathan, T. 著作を一覧する
発行日: 2011年 8月11日
出版者: Copernicus Publications on behalf of the European Geosciences Union
誌名: Atmospheric Chemistry and Physics
巻: 11
号: 15
開始ページ: 8215
終了ページ: 8230
出版社 DOI: 10.5194/acp-11-8215-2011
抄録: To better characterize the tropical aerosols in Indian region, PM10 samples collected from Chennai, India (13.04°N; 80.17°E) were analyzed for carbonaceous and water-soluble ionic components. Concentration ranges of elemental carbon (EC) and organic carbon (OC) were 2.4-14 μg m^[-3] (ave. 6.5 μg m^[-3]) and 3.2-15.6 μg m^[-3] (ave. 9.1 μg m^[-3]) in winter samples whereas they were 1.1-2.5 μg m^[-3] (ave. 1.6 μg m^[-3]) and 4.1-17.6 μg m^[-3] (ave. 9.7 μg m^[-3]) in summer samples, respectively. Concentration of secondary organic carbon (SOC) retrieved from EC-tracer method was 4.6 ± 2.8 μg m^[-3] in winter and 4.3 ± 2.8 μg m^[-3] in summer. OC accounted for 38.5 ± 14 % (n = 49) of combined concentrations of carbonaceous and ionic components in PM10. We also found that OC concentrations are generally higher than those of SO_[4]^[2-] (8.8 ± 2.5 μg m^[-3] and 4.1 ± 2.7 μg m^[-3] in winter and summer, respectively), which was the most abundant ionic species (57 %) followed by NH_[4]^[+] (15 %) > NO_[3]^[-] > Cl^[-] > K^[+] > Na^[+] > Ca^[2+] > MSA^[-] > Mg^[2+]. The mass fractions of EC, organic matter (OM) and ionic species varied seasonally, following the air mass trajectories and corresponding source strength. Based on mass concentration ratios of selected components and relations of EC and OC to marker species, we found that biofuel/biomass burning is a major source of atmospheric aerosols in South and Southeast Asia. The high concentrations of SOC and WSOC/OC ratios (ave. 0.45; n = 49) as well as good correlations between SOC and WSOC suggest that the secondary production of organic aerosols during long-range atmospheric transport is also significant in this region. This study provides the baseline data of carbonaceous aerosols for southern part of the Indian subcontinent.
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 河村 公隆


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