Molecular markers for biomass burning associated with the characterization of PM2.5 and component sources during dry season haze episodes in Upper South East Asia

doi:10.1016/j.scitotenv.2018.12.201

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標題:	Molecular markers for biomass burning associated with the characterization of PM2.5 and component sources during dry season haze episodes in Upper South East Asia
作者:	Thepnuan, Duangduean Chantara, Somporn Lee, Chung-Te Lin, Neng-Huei Ying I. Tsai(蔡瀛逸)
貢獻者:	Chiang Mai Univ, Fac Sci, Dept Chem, Environm Chem Res Lab Chiang Mai Univ, Fac Sci, Environm Sci Res Ctr Natl Cent Univ, Grad Inst Environm Engn Natl Cent Univ, Dept Atmospher Sci, Cloud & Aerosol Lab Chia Nan Univ Pharm & Sci, Dept Environm Engn & Sci
關鍵字:	PM2.5 Biomass burning Water-solLible ions Carboxylates Anhydrosugars Saccharides
日期:	2019-03
上傳時間:	2020-07-29 13:52:50 (UTC+8)
出版者:	ELSEVIER SCIENCE BV
摘要:	Severe air pollution in the form of smoke haze in the northern part of Southeast Asia (SEA) occurs annually in the dry season clue to huge open area burning. Molecular markers of biomass burning were investigated by characterization of fine particles (PM2.5) collected in the dry season (23 February-28 April 2016). The average PM2.5, organic carbon (OC) and elemental carbon (EC) concentrations were 64.3 +/- 17.6 mu g m(-3), 23.6 +/- 8.1 mu g m(-3) and 2.85 +/- 0.98 mu g m(-3), respectively. SO42- was the dominant species (8.73 +/- 2.88 mu g m(-3)) of water-soluble ion, followed by NH4+ (3.32 +/- 1.01 mu g m(-3)) and NO3- (2.70 +/- 0.51 mu g m(-3)). High concentrations of the biomass burning tracers K+ (1.27 +/- 038 mu g m(-3)) and levoglucosan (1.22 +/- 0.75 mu g m(-3)) were observed. The ratios of levoglucosan/K+ (0.92 +/- 0.35) and levoglucosanlmannosan (20.4 +/- 4.1) identified forest and agricultural waste burning as major contributors to the aerosol. Strong correlations (r > 0.800) between levoglucosan and OC, K+, anhydrosugar isomer (mannosan and galactosan) and other saccharides (mannose, arabitol and mannitol) verified that combustion of biomass was the major source of organic compounds associated with PM2.5 aerosols. Oxalate was the most abundant (0.75 +/- 0.17 mu g m(-3); 53%) of the carboxylates. The concentration of oxalate was strongly correlated to that of PM2.5 (r = 0.799) and levoglucosan (r = 0.615), indicating that oxalate originates mainly from primary emissions from biomass burning rather than secondary formation from photochemical processes. Backward trajectories indicated that long-range transport air masses influencing air quality in Northern Thailand originated to the west and southwest. (C) 2018 Elsevier B.V. All rights reserved.
關聯:	Science of the Total Environment, v.658, pp.708-722
顯示於類別:	[環境工程與科學系(所)] 期刊論文

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