Climatic and environmental implications from organic matter in Dasuopu glacier in Xixiabangma in Qinghai-Tibetan Plateau  

作　　者：谢树成 姚檀栋 康世昌 段克勤 徐柏青 L. G. Thompson 

机构地区：[1]Byrd Polar Research Center, the Ohio State University

出　　处：《Science China Earth Sciences》1999年第4期383-391,共9页中国科学（地球科学英文版）

基　　金：Project supported by the National Scaling Plan (KZ951-A1-204-02-03);the National Natural Science Foundation of China (Grant No. 49671021).

摘　　要：A series of organic compounds in snow and ice were identified from Dasuopu glacier in Xixiabangma in Qinghai-Tibetan Plateau. Organic compounds derived from natural organisms include n-alkanes ranging from C15 to C33, normal monocarboxylic acids of C6-C18, n-alkan-2-ones of C24-C31 and esters. The unstable compounds widely present in lower troposphere disppear in the middle-upper troposphere. I^ots of other organic compounds from petroleum residues were also unexpectedly identified from the glacier, covering pristane, phytane, extended tricyclic terpanes of C!9-C29 , C24 tetracyclic terpane, αβ hopane compounds of C27-C35 , and cholestanes of C27-C29 . The remote Xixiabangma region is unambiguously polluted from anthropology activities. The petroleum residues were proposed to be mainly from the Mideast and India, not from China. The organic pollutants from oil fires ignited during the well-known Gulf War which broke out in 1991 were also recorded in the glacier. Such organic indexes as nC29/nC!7, nC29/nC27 , nC29/ nC24 , C30-ketone/C30-ester, C24-tetracyclic-/C24-tricyclic-terpane and CPIn (n standing for n-alkanes) exhibit the same strong seasonal variation as δ180, providing information on the atmospheric circulation of the plateau. These ratios decrease in summer half year when the monsoon dominated, and increase in winter half year when the westerly stream jet dominated.A series of organic compounds in snow and ice were identified from Dasuopu glacier in Xixiabangma in Qinghai-Tibetan Plateau. Organic compounds derived from natural organisms include n-alkanes ranging from C₁₅ to C₃₃, normal monoearboxylie acids of C₆—C₁₈, n-alkan-2-ones of C₂₄—C₃₁ and esters. The unstable compounds widely present in lower troposphere disppear in the middle-upper troposphere. Lots of other organic compounds from petroleum residues were also unexpectedly identified from the glacier, covering pristane, phytane, extended tricyclie terpanes of C₁₉—C₂₉, C₂₄ tetracyclic terpane, αβ hopane compounds of C₂₇—C₃₅, and cholestanes of C₂₇—C₂₉. The remote Xixiabangma region is unambiguously polluted from anthropology activities. The petroleum residues were proposed to be mainly from the Mideast and India, not from China. The organic pollutants from oil fires ignited during the well-known Gulf War which broke out in 1991 were also recorded in the glacier.

关 键 词：Qinghai-Tibetan PLATEAU SNOW and ice in GLACIER organic compound petroleum RESIDUE climate and environment. 

分 类 号：X142[环境科学与工程—环境科学]