极地研究

极地研究 ›› 2008, Vol. 20 ›› Issue (4): 310-319.

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东南极米洛半岛近地面大气CH_4浓度及其δ~(13)C的时空变化特征

刘雅淑;朱仁斌;李香兰;徐华;孙立广;   

  • 出版日期:2008-12-30 发布日期:2008-12-30

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

  • Online:2008-12-30 Published:2008-12-30

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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。

关键词: 南极;米洛半岛;大气;CH4;碳同位素

Abstract:

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 δ13C 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 the global atmosphere.The summertime variation of CH4 concentrations showed a large fluctuation,corresponding to the air temperature.The average δ13C-CH4 was about(-38.26±0.52)‰.CH4 concentrations and δ13C-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 δ13C values have also been discussed in this study.