中國4個(gè)國家級野外站大氣CH4本底濃度變化特征

氣候變化研究進(jìn)展 ?? 2009, Vol. 5 ?? Issue (05): 285-290.

中國4個(gè)國家級野外站大氣CH4本底濃度變化特征

劉立新,周凌晞,溫民,張芳,方雙喜,姚波

中國氣象科學(xué)研究院

收稿日期:2009-02-10 修回日期:2009-03-27 出版日期:2009-09-30 發(fā)布日期:2009-09-30
通訊作者: 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是僅次于CO2的重要溫室氣體。2006年9月至2008年8月期間，按全球大氣本底觀測要求，在青海瓦里關(guān)、北京上甸子、浙江臨安和黑龍江龍鳳山4個(gè)國家級野外站開展每周一次空氣樣品flask瓶采樣分析，獲得了該地區(qū)為期2 a的大氣CH4本底濃度資料。結(jié)果表明，2 a間瓦里關(guān)、上甸子、臨安和龍鳳山4站CH4濃度年均增幅分別為9.1×10-9、3.8×10-9、21.8×10-9和8.2×10-9；瓦里關(guān)站大氣CH4濃度增長趨勢與全球平均狀況較為接近，能較好地反映北半球中高緯度內(nèi)陸地區(qū)大氣本底特征；但上甸子站年均本底值相對較低且季振幅偏小，而龍鳳山和臨安站季節(jié)變化規(guī)律相似，表現(xiàn)為CH4濃度冬季高而夏季偏低且季振幅較大。

關(guān)鍵詞: 大氣CH4, 瓶采樣, 本底濃度, 區(qū)域差異

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

劉立新;周凌晞;溫民;張芳;方雙喜;姚波. 中國4個(gè)國家級野外站大氣CH4本底濃度變化特征[J]. 氣候變化研究進(jìn)展, 2009, 5(05): 285-290.

国产综合在线观看视频,国产精品原创视频,亚洲国产熟亚洲女视频,一级风流片a级国产