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湖泊科学  2010 

青藏高原南部空姆错湖芯中陆源正构烷烃氢同位素比值的气候意义

DOI: 10.18307/2010.0118

Keywords: 正构烷烃,湖泊沉积,氢同位素比值,空姆错,气候,青藏高原

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Abstract:

在青藏高原南部空姆错钻取了-根浅湖芯,对其中时间跨度约为50年的剖面按7年间隔对其中陆源正构烷烃(C25,C27,C29,C31)进行了提取分析。通过将这些生物标志物的氢同位素比值与附近浪卡子气象站和拉萨气象站的气象参数记录进行比较,发现这些生物标志物的δD值与生长季节时段的平均气温显著相关,而与生长季节时段的降雨量和相对湿度的相关性差,说明陆源沉积正构烷烃的氢同位素比值主要记录了气温信号,可以被用于古温度重建。

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