Isotopic effect of runoff in the Yarlung Zangbo River
Isotopic effect of runoff in the Yarlung Zangbo River
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DOI：
10.1007/s11631-012-0580-4
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发表时间：
2012-07
期刊：
影响因子：
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通讯作者：
Zhiyou Gao;Xiaodan Wang;Guan Yin
中科院分区：
文献类型：
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作者：
Zhiyou Gao;Xiaodan Wang;Guan Yin
本文主要分析了雅鲁藏布江降水的同位素效应。总体而言，大多数水样的同位素组成落在全球大气降水线的右上方。根据样品的δD和δ 18 O数据，计算出其降水方程为δD=8 δ 18 O +10，表明它们是由降水形成的，但经历了强烈的蒸发作用。水体δD和δ 18 O呈向西、向南降低的趋势，具有明显的区域-大陆效应（水体重同位素随距海岸距离的增加而不断亏损）。雅鲁藏布江干流和主要支流均存在明显的海拔效应。水同位素组成的分布与孟加拉湾和怒江降水云的移动有关，并受青藏高原地形和气候条件的影响。
This paper mainly analyzed the isotopic effect of precipitation in the Yarlung Zangbo River. On the whole, the isotopic compositions of most water samples fall on the upper right of the global meteoric water line. According to δD and δ18O data of the samples, the precipitation equation is figured out as δD=8 δ18O+10, showing that they are derived from precipitation but have experienced intensive evaporation. With obvious region-continental effect (a continuous depletion in heavy isotopes in water bodies occurs with increasing distance from the coast), the water presents a reducing trend of δD and δ18O westwards and southwards. Altitudinal effect is evident here, occurring in both trunk stream and main branches of the Yarlung Zangbo River. The distribution of water isotopic compositions is concerned with the movement of precipitation clouds from the Bay of Bengal and the Nujiang River and is affected by the topographic and climatic conditions of the Tibetan Plateau.