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

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Title:	Carbonaceous aerosols in the air masses transported from Indochina to Taiwan: Long-term observation at Mt. Lulin
Authors:	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
Contributors:	土地資源學系
Keywords:	Biomass burning High-elevation aerosol Carbons from biomass burning Background carbonaceous content
Date:	2014-06
Issue Date:	2015-01-26 10:45:51 (UTC+8)
Abstract:	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 mu g m(-3) and 0.35 mu g m(-3), respectively. (C) 2013 Elsevier Ltd. All rights reserved.
Relation:	ATMOSPHERIC ENVIRONMENT 卷: 89 頁碼: 507-516
Appears in Collections:	[Department of Natural Resources ] journal articles

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