Aerosol chemical profile of near-source biomass burning smoke in sonla, vietnam during 7-SEAS campaigns in 2012 and 2013

Chung Te Lee, Shidharth Sankar Ram, Dac Loc Nguyen, Charles C.K. Chou, Shih Yu Chang, Neng Huei Lin, Shuenn Chin Chang, Ta Chih Hsiao, Guey Rong Sheu, Chang Feng Ou-Yang, Kai Hsien Chi, Sheng Hsiang Wang, Xue Chang Wu

研究成果: 雜誌貢獻期刊論文同行評審

38 引文 斯高帕斯(Scopus)

摘要

This study aimed to investigate aerosol chemical characteristics and to obtain the chemical profile of near-source biomass burning (BB) aerosols at a site (675 m a.s.l.) in Sonla, Northern Vietnam. Particulate matter (PM) with an aerodynamic diameter less than or equal to 2.5 μm (PM2.5) was collected over a 24 h sampling period as part of the Seven South East Asian Studies (7-SEAS) campaign. The studies were conducted when BB was highly active — that is, in the spring of 2012 and 2013. The collected particles were analyzed for carbonaceous fractions and water-soluble components, in addition to the mass concentration. Data obtained were further analyzed to determine the stable species profile by classifying the 5-day air-mass backward trajectories. The average PM2.5 mass concentrations were 51 ± 19 μg m–3 and 57 ± 27 μg m–3 in 2012 and 2013, respectively. Carbonaceous contents dominated BB aerosol, with 59% ± 9% and 58% ± 9% in organic carbon (OC) and 9% ± 3% and 10% ± 3% in elemental carbon (EC) of PM2.5 in 2012 and 2013, respectively. Of the 8 carbonaceous fractions analyzed thermo-optically for PM2.5, OC3 (evolution temperature at 280°C–480°C) was most abundant in OC fractions, and EC1-OP (elemental carbon evolved at 580°C minus the pyrolized OC fractions) was predominant in EC fractions in most occasions. Among the measured water-soluble inorganic ions, NH4 + and SO4 2- widely varied, indicating the influence of different trajectory origins. This finding was confirmed by trajectory classification of aerosol data. The trajectories were also distinguished with respect to char-EC to soot-EC ratio, and water-soluble OC. These characteristics were highest in the trajectory from the BB source area.

原文???core.languages.en_GB???
頁(從 - 到)2603-2617
頁數15
期刊Aerosol and Air Quality Research
16
發行號11
DOIs
出版狀態已出版 - 11月 2016

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