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Indian monsoon influences altitude effect of δ^(18)O in precipitation/river water on the tibetan plateau

chinese Science Bulletin 2009年第15期54卷 2724-2731页

作者： yao tandong1,2, zhou hang1,3.& yang xiaoxin1,3.1 key laboratory of tibetan environment changes and land surface processes, institute of tibetan plateau research, chinese academy of sciences, beijing 100085, china 2 State key laboratory of Cryosphere sciences, Cold and Arid Regions environmental and Engineering research institute, chinese academy of sciences, Lanzhou 730000, china 3 Graduate University of chinese academy of sciences, beijing 100049, china key laboratory of tibetan environment changes and land surface processes Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China State key laboratory of Cryosphere sciences Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou China Graduate University of chinese academy of sciences Beijing China

The δ 18O variation in precipitation acquired from 28 stations within the network of tibetan Observation and research Platform(TORP)is studied, with the focus on the altitude effect of δ 18O in river water during monsoon precipitation in an effort to understand the monsoon influence on isotopic composition in annual river water. It is found that δ 18O in precipitation on the plateau is influenced by different moisture sources, with significant Indian monsoon influence on δ 18O composition in plateau precipitation and river water. The δ 18O of water bodies in the monsoon domain is generally more depleted than that in the westerly domain, suggesting gradual rainout of southwesterly borne marine moisture in the course of long-distance transportation and lifting over the Himalayas. The lapse rate of δ 18O in river water with altitude is the largest during monsoon precipitation, due to the increased temperature vertical gradient over the southern plateau region controlled by monsoon circulation. The combination of δ 18O in river water in monsoon (wet) and non-monsoon (dry) seasons shows a larger lapse rate than that in non-monsoon (dry) season alone. As the altitude effect of δ 18O in precipitation and river water on the tibetan plateau results from the combined effect of monsoon moisture supply and westerly moisture supply, the δ 18O composition and its altitude effect on the plateau during monsoon seasons should be considered in the reconstruction of paleoelevation of the tibetan plateau.

关键词：印度季风青藏高原降水

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