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Contributions of biomass/biofuel burning to organic aerosols and particulate matter in Tanzania, East Africa, based on analyses of ionic species, organic and elemental carbon, levoglucosan and mannosan

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タイトル: Contributions of biomass/biofuel burning to organic aerosols and particulate matter in Tanzania, East Africa, based on analyses of ionic species, organic and elemental carbon, levoglucosan and mannosan
著者: Mkoma, S. L. 著作を一覧する
Kawamura, K. 著作を一覧する
Fu, P. Q. 著作を一覧する
発行日: 2013年10月
出版者: Copernicus gesellschaft mbh
誌名: Atmospheric chemistry and physics
巻: 13
号: 20
開始ページ: 10325
終了ページ: 10338
出版社 DOI: 10.5194/acp-13-10325-2013
抄録: Atmospheric aerosol samples of PM2.5 and PM10 were collected at a rural site in Tanzania, East Africa, in 2011 during wet and dry seasons and were analysed for carbonaceous components, levoglucosan, mannosan and water-soluble inorganic ions. The contributions of biomass/biofuel burning to the organic carbon (OC) and particulate matter (PM) mass were estimated to be 46-52% and 8-13 %, respectively. The mean mass concentrations of PM2.5 and PM10 were 28 +/- 6 mu g m(-3) and 47 +/- 8 mu g m(-3) in wet season, and 39 +/- 10 mu g m(-3) and 61 +/- 19 mu g m(-3) in dry season, respectively. Total carbon (TC) accounted for 16-19% of the PM2.5 mass and 13-15% of the PM10 mass. On average, 86 to 89% of TC in PM2.5 and 87 to 90% of TC in PM10 was OC, of which 67-72% and 63% was found to be water-soluble organic carbon (WSOC) in PM2.5 and PM10, respectively. We found that concentrations of levoglucosan and mannosan (specific organic tracers of pyrolysis of cellulose) well correlated with non-sea-salt potassium (nss-K+) (r(2) = 0.56-0.75), OC (r(2) = 0.75-0.96) and WSOC (r(2) = 0.52-0.78). The K+/OC ratios varied from 0.06 to 0.36 in PM2.5 and from 0.03 to 0.36 in PM10 with slightly higher ratios in dry season. Mean percent ratios of levoglucosan and mannosan to OC were found to be 3-4% for PM2.5 and PM10 in both seasons. We found lower levoglucosan/K+ ratios and higher K+/EC (elemental carbon) ratios in the biomass-burning aerosols from Tanzania than those reported from other regions. This feature is consistent with the high levels of potassium reported in the soils of Morogoro, Tanzania, suggesting an importance of direct emission of potassium by soil resuspension although K+ is present mostly in fine particles. It is also likely that biomass burning of vegetation of Tanzania emits high levels of potassium that may be enriched in plant tissues. The present study demonstrates that emissions from mixed biomass- and biofuel-burning activities largely influence the air quality in Tanzania.
資料タイプ: article
URI: http://hdl.handle.net/2115/54113
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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