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《Environmental Science》 2005-01
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Trends and Variation of CFC-11 in the Atmosphere of Beijing

XIU Tian-yang 1,2, WANG Yue-si 1,SUN Yang1, XU Xin1, LIU Guang-Ren1 (1.Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; 2. Graduate School of the Chinese Academy of Sciences. Beijing 100039, China)  
In recent years, concentration of CFC in the atmosphere has undergone rapid changes especially in association with human activities. For the influence of CFC on climate changes and environment changes, the concentration of atmospheric CFC-11 in Beijing is continuously observed and analyzed by a gas chromatography-mass spectrometry.The seasonal variation concentration and trends of CFC-11 are reported. The results show that the seasonal variation of CFC-11 was basically similar from 1999 to 2003. There was one peak value in the seasonal variation of CFC-11 in 1999~2003. The highest monthly average concentration of CFC-11 was 1149.5±531.9×10 -12(V·V -1) in summer and the lowest monthly average concentration of CFC-11 was 487.5±131.5×10 -12(V·V -1) in spring. The annual average concentration of CFC-11 was increasing in Beijing atmosphere from 1995 to 1998, and the average increasing ratio was 17.9%. The annual average concentration of CFC-11 was slowly decreasing from 1999, and the average decreasing ratio was 10.7%. The average concentration of CFC-11 in the atmosphere of Beijing was 3~5 times of the average concentration of CFC-11 in the atmosphere of Mauna Loa Station of U.S.A.
【Fund】: 国家自然科学基金项目 (4 0 2 2 2 2 0 2 );; 中国科学院知识创新工程重大项目 (KZCX1 SW 0 1)
【CateGory Index】: X831
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