中国4个国家级野外站大气CH4本底浓度变化特征

气候变化研究进展 ›› 2009, Vol. 5 ›› Issue (05): 285-290.

中国4个国家级野外站大气CH4本底浓度变化特征

刘立新,周凌晞,温民,张芳,方双喜,姚波

中国气象科学研究院

收稿日期:2009-02-10 修回日期:2009-03-27 出版日期:2009-09-30 发布日期:2009-09-30
通讯作者: 周凌晞

Characteristics of Atmospheric CH4 Concentration Variations at Four National Baseline Observatories in China

Received:2009-02-10 Revised:2009-03-27 Online:2009-09-30 Published:2009-09-30

摘要/Abstract

摘要： CH4是仅次于CO2的重要温室气体。2006年9月至2008年8月期间，按全球大气本底观测要求，在青海瓦里关、北京上甸子、浙江临安和黑龙江龙凤山4个国家级野外站开展每周一次空气样品flask瓶采样分析，获得了该地区为期2 a的大气CH4本底浓度资料。结果表明，2 a间瓦里关、上甸子、临安和龙凤山4站CH4浓度年均增幅分别为9.1×10-9、3.8×10-9、21.8×10-9和8.2×10-9；瓦里关站大气CH4浓度增长趋势与全球平均状况较为接近，能较好地反映北半球中高纬度内陆地区大气本底特征；但上甸子站年均本底值相对较低且季振幅偏小，而龙凤山和临安站季节变化规律相似，表现为CH4浓度冬季高而夏季偏低且季振幅较大。

关键词: 大气CH4, 瓶采样, 本底浓度, 区域差异

Abstract: Methane (CH4) is the second most significant greenhouse gas. The atmospheric CH4 concentration was measured weekly by flask sampling and the gas chromatography method at four national baseline observatories, including Waliguan (WLG), Shangdianzi (SDZ), Lin'an (LAN), and Longfengshan (LFS) from September 2006 to August 2008. The analysis results of the CH4 concentration data of the two years show that the annual CH4 concentrations increased by 9.1×10-9, 3.8×10-9, 21.8×10-9 and 8.2 ×10-9 on the average, at WLG, SDZ, LAN, and LFS observatories, respectively. The growth trend for CH4 concentration at WLG observatory was very similar to that of the global average, and representative of the atmospheric baseline level of the Eurasian continent. At SDZ observatory, the value of CH4 concentration was lower and the seasonal amplitude was also much smaller. However, both at LFS and LAN observatories, the CH4 concentrations obviously varied seasonally, with the maximum concentration in winter and the minimum concentration in summer.

Key words: atmospheric CH4, flask sampling, background concentration, regional differences

刘立新;周凌晞;温民;张芳;方双喜;姚波. 中国4个国家级野外站大气CH4本底浓度变化特征[J]. 气候变化研究进展, 2009, 5(05): 285-290.