东南极米洛半岛近地面大气CH4浓度及其δ^13C的时空变化特征  

TEMPORAL AND SPATIAL VARIATIONS OF ATMOSPHERIC METHANE CONCENTRATION AND ITS δ^(13)C NEAR THE SURFACE ON MILLOR PENINSULA,EASTERN ANTARCTICA

作　　者：刘雅淑[1] 朱仁斌[1] 李香兰[2] 徐华[2] 孙立广[1] 

机构地区：[1]中国科学技术大学极地环境研究室,合肥230026 [2]中国科学院南京土壤研究所土壤与持续农业国家重点实验室,南京210091

出　　处：《极地研究》2008年第4期310-319,共10页Chinese Journal of Polar Research

基　　金：国家自然科学基金(40676005、40730107)资助

摘　　要：在中国第22次南极科学考察期间,采集了东南极米洛半岛不同地点近地面大气样品,在室内分析了样品中CH4浓度及其δ13C值,结果表明:该半岛近地面大气CH4平均浓度为(1.87±0.12)ppm,略高于全球大气甲烷平均浓度;白天10:00和夜间22:00大气CH4浓度的夏季变化呈现较大波动,与气温存在响应关系;其δ13C值变化范围为-39.31‰—-37.56‰,平均值为(-38.26±0.52)‰。对米洛半岛及周边不同地点大气CH4浓度及其δ13C的分析结果表明:大气CH4浓度的空间变化范围为1.74—2.56ppm,δ13C值的变化范围为-39.31‰—-31.25‰;CH4的δ13C值随其浓度的增加而增加。本文还讨论了影响米洛半岛大气CH4浓度及其δ13C值的因素。During the 22nd Chinese Antarctic Research Expedition （CHINARE-22）, the atmospheric gas samples near the surface were taken on Millor Peninsula and adjacent areas, eastern Antarctica, using Tedlar gas bags. Methane （ CH4 ） concentration and its δ^13 C in these air samples were analyzed in the laboratory. The average of atmospheric CH4 concentrations on this peninsula was about 1.87 ± 0.12 ppm, slightly higher than the average CH4 concentration in theglobal atmosphere. The summertime variation of CH4 concentrations showed a large fluctuation, corresponding to the air temperature. The average δ^13C-CH4 was about （ -38.26 ± 0.52）%o.CH4 concentrations and δ^13C -CH4 values at different sites varied between 1.74 and 2.56 ppm and between - 39.31‰ and - 31.25‰, respectively. The factors affecting CH4 concentration and its δ^13C values have also been discussed in this study.

关 键 词：南极 米洛半岛 大气CH4 碳同位素 

分 类 号：P402[天文地球—大气物理学与大气环境]