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地理学报  2007 

雅鲁藏布江流域降水中δ18O的时空变化

DOI: 10.11821/xb200705007, PP. 510-517

Keywords: 雅鲁藏布江流域,δ18O,降水,时空变化

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Abstract:

通过研究2005年西藏雅鲁藏布江流域拉孜、奴各沙、羊村和奴下4个站点降水中的δ18O变化,揭示了雅鲁藏布江流域降水中稳定同位素的时空变化规律。研究显示,雅鲁藏布江流域降水中δ18O季节变化明显,高值出现在季风降水之前的春季,而低值出现在季风降水季节,其间降水中δ18O具有明显的“降水量效应”;从空间上看,降水中的δ18O从下游至上游递减,造成这种分布特征主要是由于“高程效应”以及水汽远距离输送导致其中的18被贫化的结果。经计算表明,雅鲁藏布江流域降水中δ18O由于“高程效应”造成的递减率为0.34‰/100m,而水平方向上自东向西由于水汽远距离输送造成的递减率为0.7‰/100km。从季风期间大范围的降水过程来看,降水中δ18O的空间变化主要受“降水量效应”制约。

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