Vertical distributions of non-methane hydrocarbons and halocarbons in the lower troposphere over northeast China

被引:43
|
作者
Xue, Likun [2 ]
Wang, Tao [1 ,2 ,3 ]
Simpson, Isobel J. [4 ]
Ding, Aijun [5 ]
Gao, Jian [3 ]
Blake, Donald R. [4 ]
Wang, Xuezhong [3 ]
Wang, Wenxing [2 ,3 ]
Lei, Hengchi [6 ]
Jing, Dezhen [7 ]
机构
[1] Hong Kong Polytech Univ, Dept Civil & Struct Engn, Kowloon, Hong Kong, Peoples R China
[2] Shandong Univ, Environm Res Inst, Jinan 250100, Shandong, Peoples R China
[3] Chinese Res Inst Environm Sci, Beijing, Peoples R China
[4] Univ Calif Irvine, Dept Chem, Irvine, CA 92717 USA
[5] Nanjing Univ, Inst Climate & Global Change Res, Nanjing 210008, Jiangsu, Peoples R China
[6] Chinese Acad Sci, Inst Atmospher Phys, Beijing, Peoples R China
[7] Jilin Prov Meteorol Bur, Weather Modificat Off, Changchun, Jilin, Peoples R China
关键词
Non-methane hydrocarbon; Halocarbon; Aircraft study; NE China; Vertical distribution; Regional plume; VOLATILE ORGANIC-COMPOUNDS; PEARL RIVER-DELTA; ASIAN CONTINENTAL OUTFLOW; PACIFIC TRACE-P; HONG-KONG; SOURCE APPORTIONMENT; CHEMICAL EVOLUTION; COMPOUNDS VOCS; MIXING RATIOS; RURAL SITES;
D O I
10.1016/j.atmosenv.2011.08.072
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Vertical distributions of air pollutants are crucial for understanding the key processes of atmospheric transport and for evaluating chemical transport models. In this paper, we present measurements of non-methane hydrocarbons (NMHCs) and halocarbons obtained from an intensive aircraft study over northeast (NE) China in summer 2007. Most compounds exhibited a typical negative profile of decreasing mixing ratios with increasing altitude, although the gradients differed with different species. Three regional plumes with enhanced VOC mixing ratios were discerned and characterized. An aged plume transported from the northern part of the densely populated North China Plain (NCP; i.e. Beijing-Tianjin area) showed relatively higher levels of HCFC-22, 1,2-dichloroethane (1,2-DCE) and toluene. In comparison, the plume originating from Korea had higher abundances of CFC-12, tetrachloroethene (C2Cl4) and methyl chloride (CH3Cl), while regional air masses from NE China contained more abundant light alkanes. By comparing these results with the earlier PEM-West B (1994) and TRACE-P (2001) aircraft measurements, continuing declining trends were derived for methyl chloroform (CH3CCl3), tetrachloromethane (CCl4) and C2Cl4 over the greater China northwestern Pacific region, indicating the accomplishment of China in reducing these compounds under the Montreal protocol. However, the study also provided evidence for the continuing emissions of several halocarbons in China in 2007, such as CFCs (mainly from materials in stock) and HCFCs. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:6501 / 6509
页数:9
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