Carbonaceous aerosols in the air masses transported from Indochina to Taiwan: Long-term observation at Mt. Lulin

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题名:	Carbonaceous aerosols in the air masses transported from Indochina to Taiwan: Long-term observation at Mt. Lulin
作者:	王家麟;Chuang, Ming-Tung;Lee, Chung-Te;Chou, Charles C.-K.;Lin, Neng-Huei;Sheu, Guey-Rong;Wang, Jia-Lin;Chang, Shuenn-Chin;Wang, Sheng-Hsiang;Chi, Kai Hsien;Young, Chea-Yuan;Huang, Hill;Chen, Horng-Wen;Weng, Guo-Hau;Lai, Sin-Yu;Hsu, Shao-Peng;Chang, Yu-Jia;Chang, Jia-Hon;Wu, Xyue-Chang
贡献者:	理學院化學學系
关键词:	aerosols;air;altitude;Applied sciences;atmospheric chemistry;Atmospheric pollution;Background carbonaceous content;biomass;Biomass burning;burning;carbon;Carbons from biomass burning;Earth, ocean, space;Europe;Exact sciences and technology;External geophysics;High-elevation aerosol;Indochina;ions;Meteorology;monitoring;Particles and aerosols;particulates;Pollutants physicochemistry study: properties, effects, reactions, transport and distribution;Pollution;Taiwan;troposphere
日期:	2014-01-01
上传时间:	2026-04-21 14:18:58 (UTC+8)
出版者:	Elsevier Ltd.;Kidlington: Elsevier Ltd
摘要:	摘要： Eight carbonaceous fractions from aerosols were resolved using the Interagency Monitoring of Protected Visual Environments (IMPROVE) protocol (Chow et al., 1993). The aerosols were collected at the Mountain Lulin Atmospheric Background Station (Mt. Lulin, 2862 m a.s.l.) in Central Taiwan from April 2003 to April 2012. The monthly and yearly levels of organic carbon (OC) and elemental carbon (EC) varied consistently with PM2.5 mass concentrations during biomass burning (BB) period. The highest monthly carbonaceous content was observed in March and the highest yearly carbonaceous concentration was observed in 2007. This finding is consistent with the BB activity in Indochina and indicates that carbonaceous content is a major component of BB aerosols. Lee et al. (2011) classified four trajectory groups from the air masses transported to Mt. Lulin during the aerosol collection period. For the air masses transported from the BB area (the BB group) in Indochina, the carbonaceous content was greater than the water-soluble ions in PM2.5, and the OC/EC ratio (4.8 ± 1.5) was high. With EC as the indicator of primary emission sources, the air masses of the BB group were found to contain more primary than secondary OC. The Anthropogenic group (from the local and free troposphere below the 700-hPa pressure level over the Asian continent) probably contained more secondary than primary OC or the sources of OC and EC could be quite diverse. The average char-EC/soot-EC (low-temperature EC/high-temperature EC) ratios were 3.9 ± 3.5, 0.4 ± 0.4, 0.9 ± 0.8, and 0.3 ± 0.4 for the trajectory groups BB, SNBB (from BB source areas during the non-BB period), Anthropogenic, and FT (from the oceanic area and the free troposphere above the 700-hPa pressure level over the Asian continent), respectively. The presence of a high char-EC/soot-EC ratio confirmed the correct classification of the BB group, whereas the low ratios from the other groups indicated the strong influence of vehicle exhaust. It is noted that higher OC and EC levels were obtained at Mt. Lulin as compared with those obtained at other high-elevation sites. This difference suggested that the Indochina BB plume exhibited a more serious climatic impact on the background air in East Asia than in other places in Asia and Europe. On the basis of the carbonaceous levels of the SNBB and FT groups, the background OC and EC levels of approximately 3000 m in the West Pacific are around 1.33 μg m−3 and 0.35 μg m−3, respectively. •Long-term observation of carbonaceous aerosols in East Asia.•Transported Indochina biomass burning plume is observed at Mt. Lulin.•Aerosol carbonaceous content is enhanced in biomass burning plume.•The impact of Indochina biomass burning is more serious than other places.•The West Pacific background OC and EC are 1.33 μg m−3 and 0.35 μg m−3. 出版者： Kidlington: Elsevier Ltd 出版日期： 2014-06-01 出處： Atmospheric Environment, 2014-06, Vol.89, p.507-516 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2013 Elsevier Ltd 版權： 2015 INIST-CNRS 識別號： ISSN: 1352-2310 識別號： EISSN: 1873-2844 識別號： DOI: 10.1016/j.atmosenv.2013.11.066
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