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Observations of High Levels of Ozone-Depleting CFC-11 at a Remote Mountain-Top Site in Southern China
Environmental Science & Technology Letters ( IF 10.9 ) Pub Date : 2019-02-11 , DOI: 10.1021/acs.estlett.9b00022
Youjing Lin 1 , Daocheng Gong 1 , Shaojun Lv 1 , Yaozhou Ding 1 , Gengchen Wu 1 , Hao Wang 1, 2 , Yanlei Li 1 , Yujin Wang 1 , Lei Zhou 1 , Boguang Wang 1, 2
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A field campaign was carried out in the autumn of 2017 to measure the CFC-11 concentrations at a remote mountain-top site in southern China. During the sampling period, the mixing ratios of CFC-11 (329 ± 9 pptv) were considerably higher than both the regional backgrounds of East Asia (235 ± 1 pptv) and the Northern Hemisphere backgrounds (230 ± 1 pptv). Significantly high levels of CFC-11 were observed in late October, and the high CFC-11 concentrations correlate well with the concentrations of anthropogenic tracers. Further analysis indicates that the observed high levels of CFC-11 are largely due to contributions from the less developed regions in southwestern and central China, with only a minor fraction coming from the Pearl River Delta metropolitan region in southern China. The findings of this study suggest that unbalanced regional economic development and a lack of effective regulatory actions are likely the main factors for increased CFC-11 emissions in East Asia.
更新日期:2019-02-11
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