Stable Isotope Variations in Precipitation and Moisture Trajectories on the Western Tibetan Plateau, China
Stable Isotope Variations in Precipitation and Moisture Trajectories on the Western Tibetan Plateau, China
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DOI：
10.1657/1523-0430(07-511
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发表时间：
2007-11
期刊：
影响因子：
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通讯作者：
Wusheng Yu;T. Yao;L. Tian;Yaoming Ma;N. Kurita;K. Ichiyanagi;Yu Wang;Weizheng Sun
中科院分区：
文献类型：
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作者：
Wusheng Yu;T. Yao;L. Tian;Yaoming Ma;N. Kurita;K. Ichiyanagi;Yu Wang;Weizheng Sun
西藏高原西部阿里地区狮泉河和改则站降水δ 18 O和δD的观测资料为分析该地区降水δ 18 O和δD的变化提供了资料。温度控制着该区降水中δ 18 O的含量。狮泉河和改则站降水中δ 18 O与气温呈显著正相关，尤其是降水加权月平均δ 18 O。青藏高原西部及邻区δ 18 O- T相关性自南向北逐渐增强，西南季风活动逐渐减弱。最强的相关性是在和田。在南部新德里，由于夏季水汽主要来自印度洋，δ 18 O与气温的相关性较差。阿里地区降水样品中δD与δ 18 O的相关性较好，与邻近地区和全球大气降水线相似。青藏高原西部及邻区夏季季节平均氘过量（d）值由南向北逐渐增大，是西南季风活动向北逐渐减弱的结果。
ABSTRACT Observations at the Shiquanhe and Gaize meteorological stations provide data for analysis of δ18O and δD variations in precipitation for the Ngari (Ali) region, western Tibetan Plateau. Temperature controls δ18O in precipitation in this area. δ18O in precipitation positively correlates with air temperature at the Shiquanhe and Gaize stations, especially for precipitation weighted monthly mean δ18O. The δ18O – T correlation gradually strengthens from south to north across the western Tibetan Plateau and adjacent regions, with gradual weakening of southwest monsoon activity. The strongest correlation is found at Hetian. There is a poor correlation between δ18O and air temperature in the south at New Delhi because the moisture derives predominantly from the Indian Ocean in summer. The Ngari region exhibits a close relation between δD and δ18O in precipitation samples, similar to stations in adjacent regions and the global meteoric water line. The summer seasonal averaged deuterium excess (d) values increase gradually from south to north across western Tibetan and adjacent areas, resulting from southwest monsoon activity gradually weakening to the north.