Decline in the concentrations of chlorofluorocarbons (CFC-11, CFC-12 and CFC-113) in an urban area of Beijing, China
Decline in the concentrations of chlorofluorocarbons (CFC-11, CFC-12 and CFC-113) in an urban area of Beijing, China
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DOI：
10.1016/j.atmosenv.2007.07.005
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发表时间：
2007-12
影响因子：
5
通讯作者：
D. Qin
中科院分区：
文献类型：
--
作者：
D. Qin
2005年1月至2007年3月，在北京市区采集了352个全空气样品。本文对北京城市大气中氯氟烃（CFCs：CFC-11、CFC-12和CFC-113）浓度的时间变化进行了研究。这些浓度的加权平均月值已与来自北半球的数据进行了比较。可以得出结论，在所观察的时间段内，CFCs的平均增加相对较小，相对于全球背景增加10- 15%。CFC-11、CFC-12和CFC-113的CFC浓度变化率分别为-1.39、-1.04和-0.16pptv/月。三种化合物的CFC浓度向背景值的趋势被观察到下降，并表明根据蒙特利尔议定书限制CFC的排放正在生效。
During this study 352 whole air samples were collected in an urban area of Beijing between January 2005 and March 2007. The temporal variation of the concentrations of chlorofluorocarbons (CFCs: CFC-11, CFC-12, and CFC-113) in air in the Beijing urban atmosphere is presented and discussed. The weighted mean monthly values of these concentrations have been compared with the data from the north hemisphere. It has been concluded that, in the observed period of time, the mean enhancement of CFCs was relatively small, with increase of 10–15%, with respect to the global background. Change rate in concentrations of CFCs is −1.39, −1.04, and −0.16pptv/month for CFC-11, CFC-12, and CFC-113, respectively. The tendency of the CFC concentration of the three compounds toward background values is observed to fall and indicates that limitation of emission of CFCs is taking effect, under the Montreal Protocol.