RECENT LEVELS AND TRENDS OF TRACE CHLOROFLUOROCARBONS(CFCs) IN THE PEARL RIVER DELTA REGION
RECENT LEVELS AND TRENDS OF TRACE CHLOROFLUOROCARBONS(CFCs) IN THE PEARL RIVER DELTA REGION
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Z. Fang;Wang Xin-ming;Yi Zhi-gang;Fu Jiamo
中科院分区：
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作者：
Z. Fang;Wang Xin-ming;Yi Zhi-gang;Fu Jiamo
采用低温预富集-GC/MS法测定了珠江三角洲（珠三角）地区大气中CFC-11、CFC-12、CFC-113和CFC-114的浓度，结果表明，珠江三角洲鼎湖山地区CFC-12和CFC-11的年平均浓度高于全球本底站，表明珠江三角洲存在CFC-12和CFC-11的排放源，CFC-113的水平接近全球背景站的水平，广州市区的CFC-113和CFC-114的水平也接近鼎湖山，这意味着CFC-113和CFC-113的排放量可以忽略不计，广州和鼎湖山四种CFCs的日变化幅度较小，无明显规律，广州地区的CFCs含量在夏季和秋季较高，这是由于气温较高导致空调系统频繁使用CFCs的季节，鼎湖山地区CFCs的平均含量在夏季和秋季较高，鼎湖山地区CFCs的平均含量在夏季和秋季较低初步估算，珠江三角洲地区大气中CFC-12、CFC-11和CFC-114的浓度在2001年前后达到峰值，之后缓慢下降，但在2002年以后，珠江三角洲地区大气中CFC-12、CFC-11和CFC-114的浓度在2003年达到峰值，在2004年以后达到峰值，在2005年以后达到峰值，在2006年以后达到峰值，在2007年以后达到峰值。而1997-2005年期间，氟氯化碳-113的含量单调下降。
Ambient chlorofluorocarbons(CFCs),including CFC-11,CFC-12,CFC-113 and CFC-114,were measured in the Pearl River Delta(PRD) region by the cryogenic pre-concentration-GC/MS method.The annual mean levels of CFC-12 and CFC-11 in the Dinghu Mountain,a regional background site in PRD,were higher than those in global background stations,indicating that there were emission sources of CFC-12 and CFC-11 in PRD.Levels of CFC-113 are approximate to those in global background stations,also the levels in urban areas of Guangzhou were almost close to those in the Dinghu Mountain for both CFC-113 and CFC-114,implying negligible emission of CFC-113 and CFC-114 in PRD.Diurnal variations are of small scale for the four CFCs both in Guangzhou and Dinghu Mountain without obvious patterns.CFCs in Guangzhou are higher in summer and autumn when air conditioning systems with CFCs as refrigerants are frequently used due to higher air temperature.The mean levels of CFCs in the Dinghu Mountain,however,are lower in summer and autumn than in winter and spring.The reason is that there are no emission sources in Dinghu and the levels there are mainly controlled and influenced by diffusion conditions and monsoons in PRD.Preliminary estimation shows that in PRD the atmospheric levels of CFC-12,CFC-11 and CFC-114 reached peak values around 2001 and decreased slowly afterwards,whereas the levels of CFC-113 monotonously decreased during 1997-2005.