Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/19776
Title: Vertical distributions of non-methane hydrocarbons and halocarbons in the lower troposphere over northeast China
Authors: Xue, L
Wang, T 
Simpson, IJ
Ding, A
Gao, J
Blake, DR
Wang, X
Wang, W
Lei, H
Jin, D
Keywords: Aircraft study
Halocarbon
NE China
Non-methane hydrocarbon
Regional plume
Vertical distribution
Issue Date: 2011
Publisher: Pergamon Press
Source: Atmospheric environment, 2011, v. 45, no. 36, p. 6501-6509 How to cite?
Journal: Atmospheric environment 
Abstract: 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.
URI: http://hdl.handle.net/10397/19776
ISSN: 1352-2310
EISSN: 1873-2844
DOI: 10.1016/j.atmosenv.2011.08.072
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