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| Atmoshperic sulfur hexafluoride in Beijing and near cities during the summer of 2008 |
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Abstract As a potent greenhouse gas, sulfur hexafluoride (SF6) has been measured during the summer of 2008. Air samples from eight sites of North China were collected twice daily, the distributed sites including urban, suburban and rural locations. They are Beijing, Xinglong, Langfang, Cangzhou, Shijiazhuang, Zhuozhou, Baoding and Yucheng. During the observing period, the average mixing ratio of SF6 for these sites were (10.7±5.1)′10-12、(6.7±0.6)′10-12、(7.2±1.6)′10-12、(8.0±1.7)′10-12、(9.6±5.5)′10-12、(7.6±2.1)′10-12,(8.3±3.5)′10-12 and (8.5±2.0)′10-12 (V/V), respectively. The regional mixing ratio was 8.3′10-12 V/V for the North China. The magnitude and variation of SF6 was mainly affected by the anthropogenic emission source with an impulse pattern. As there was no sign of notable SF6 emission in the influence area of Xinglong, the station can be qualified as a background monitoring site for North China. The observed growth rate of SF6 in Xinglong was higher than that of the global. Anyway, the activities for energy saving and emission reduction did debase the concentration of SF6 in Beijing during the Olympic time.
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Received: 13 January 2010
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