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Molecular composition and size distribution of sugars, sugar-alcohols and carboxylic acids in airborne particles during a severe urban haze event caused by wheat straw burning

dankan 添加于 2011/5/16 15:56:19  1865次阅读 | 0次推荐 | 0个评论

Molecular compositions and size distributions of water-soluble organic compounds (WSOC, i.e., sugars, sugar-alcohols and carboxylic acids) in particles from urban air of Nanjing, China during a severe haze event caused by field burning of wheat straw were characterized and compared with those in the summer and autumn non-haze periods. During the haze event levoglucosan (4030 ng m−3) was the most abundant compound among the measured WSOC, followed by succinic acid, malic acid, glycerol, arabitol and glucose, being different from those in the non-haze samples, in which sucrose or azelaic acid showed a second highest concentration, although levoglucosan was the highest. The measured WSOC in the haze event were 2–20 times more than those in the non-hazy days. Size distribution results showed that there was no significant change in the compound peaks in coarse mode (>2.1 μm) with respect to the haze and non-haze samples, but a large difference in the fine fraction (<2.1 μm) was found with a sharp increase during the hazy days mostly due to the increased emissions of wheat straw burning. Molecular compositions of organic compounds in the fresh smoke particles from wheat straw burning demonstrate that sharply increased concentrations of glycerol and succinic and malic acids in the fine particles during the haze event were mainly derived from the field burning of wheat straw, although the sources of glucose and related sugar-alcohols whose concentrations significantly increased in the fine haze samples are unclear. Compared to that in the fresh smoke particles of wheat straw burning an increase in relative abundance of succinic acid to levoglucosan during the haze event suggests a significant production of secondary organic aerosols during transport of the smoke plumes.

作 者:Gehui Wang , Chunlei Chen, Jianjun Li, Bianhong Zhou, Mingjie Xie, Shuyuan Hu, Kimitaka Kawamura and Yan Chen
期刊名称: Atmospheric Environment
期卷页: May 2011 第 45卷 第 15期 2473-2479页
学科领域:地球科学 » 大气科学 » 大气环境与全球气候变化
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原文链接:http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VH3-52890ND-7&_user=10&_coverDate=05%2F31%2F2011&_rdoc=3&_fmt=high&_orig=browse&_origin=browse&_zone=rslt_list_item&_srch=doc-info(%23toc%236055%232011%23999549984%233076767%23FLA%23display%23Volu
DOI: 10.1016/j.atmosenv.2011.02.045
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关键词: Water-soluble organic compounds; Biomass burning; Atmospheric aerosols; Composition and size distribution; Levoglucosan and succinic acid
相关报道: http://paper.sciencenet.cn/htmlpaper/201151615595937416882.shtm
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