کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6344074 | 1620558 | 2012 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Elevated mixing ratios and sources of methyl chloride: Results from a survey in the Yangtze River Delta region of China Elevated mixing ratios and sources of methyl chloride: Results from a survey in the Yangtze River Delta region of China](/preview/png/6344074.png)
Measurements of air samples collected at four urban sites in Shanghai, Taizhou, Liyang and Lin'an and a rural site in Chongming Island of the Yangtze River Delta (YRD) region of China revealed noticeably elevated mixing ratios of methyl chloride (CH3Cl). Median CH3Cl mixing ratios reached 0.9-3.9 ppbv at the five sampling locations, significantly higher than most of those reported for other regions in the world. Especially at Liyang site and Taizhou site, CH3Cl exhibited quite high levels with mixing ratios ranging from 0.9 up to 25.9 ppbv (n = 28) and 0.7 up to 17.3 ppbv (n = 29), respectively.With good correlation with methylene chloride (CH2Cl2) and ethylene dichloride (EDC), abundant CH3Cl in urban Shanghai, was mainly associated with industrial activities, although biomass burnings exist widely in rural areas of east China. The high concentrations and large variation of CH3Cl and EDC simultaneously appeared at Liyang site. Spikes of CH3Cl and EDC concentrations as well as toluene/benzene (T/B) ratios frequently present in easterly airflows indicated an important contribution from emissions of chemical plants clustering in the east of Liyang. Different emission sources may contribute to ambient CH3Cl at Taizhou site, which was suggested by the two kinds of linear regressions of CH3Cl to some other compounds detected. The substantially elevated CH3Cl levels suggest significant influence of intensive industrial activities on the YRD atmosphere.
âºMeasurements of CH3Cl in the Yangtze River Delta region of China were performed. âºElevated atmospheric CH3Cl loadings were observed. âºThe elevated CH3Cl levels were mainly attributable to industrial emissions. âºThe findings have implications on CH3Cl budgets in fast economic growing regions.
Journal: Atmospheric Research - Volumes 104â105, February 2012, Pages 172-181