瓦里关山大气CO_2及其δ^(13)C本底变化

Background variations of atmospheric carbon dioxide and its stable carbon isotopes at Mt.Waliguan

利用 1991— 2 0 0 1年期间实测资料 ,分析了瓦里关全球基准站大气CO2 及其δ13 C本底特征 ,并探讨了与源汇过程的关系 .结果表明 ,瓦里关大气CO2 及其δ13 C本底变化主要反映了北半球中高纬度大陆自然生态系统源汇的周期性季节特征 ,而海洋的作用相对较弱 ;大气CO2 及其δ13 C本底浓度范围与所处纬度带平均状况基本吻合 ,年平均值以及年际间涨落与全球水平的一致性反映出化石燃料燃烧等人为排放对大气圈的全球性影响 ;瓦里关站提供的主要温室气体本底观测资料 ,既能体现亚洲内陆地域特点又具有全球代表性 ,配合以其它相关资料 ,还可进一步揭示中国内陆高原大气CO2 及其δ13 C本底特征的成因 .

By using the observational data during a period of 1991—2001 at Waliguan Observatory (36°17′N,100°54′E,3816?m asl),atmospheric CO\-2 and its δ 13 C background and their potential relationship with sources and sinks were studied.Results indicated that,both CO\-2 and δ 13 C possess long-term trend/seasonal cycle and highly correlation to each other.CO\-2 along with δ 13 C inner-annual cycles basically indicated the terrestrial ecosystem source/sink seasonal features in the middle-high latitude of Northern Hemisphere,while the impact of ocean is inferior by comparison.The distribution of CO\-2 and δ 13 C coincided with the results of other monitoring records in the similar latitudinal band.The inter-annual variations reflected world wide influence of fossil fuel combustion emission to the atmosphere.The major greenhouse gas observational data obtained at Waliguan Observatory reflect both the Asian mainland and global features.It can further interpret the formation of CO\-2 and δ 13 C background in the inland plateau of China by combining with other relevant information.