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On Characteristics of Hydrogen and Oxygen Isotope in Precipitation in Yunnan and Analysis of Moisture Sources

HU Han;WANG Jian-li;School of Geographic Sciences,Southwest University;Key Laboratory of Eco~environments in Three Gorges Reservoir Region,Ministry of Education;  
Based on the monitoring data of Kunming Station collected from GNIP which was confounded by IAEA and WMO,the characteristics of the hydrogen isotope and oxygen isotope and their relationships with temperature and precipitation have been analyzed in order to reveal the moisture sources based on the statistics.First,the slope and intercept value of LWML are smaller than other regions in consequence of the Yunnan~Guizhou Plateau's high altitude.The statistics shows that the variations of hydrogen isotope and oxygen isotope are different from summer and winter obviously with higher values in winter(December~February)and lower in summer(June~August),which is partially because of different moisture sources.With further study of deuterium excess and other researches,it is concluded that local evaporation accounts for a crucial proportion in the differences of deuterium excess.Then by virtue of GrADS modeling,the summer and wind vector field respectively were drawn to verify and prove that the summer moisture sources mainly influenced by moisture transportation of Indian Ocean while the winter moisture sources mainly influenced by moisture transportation of westerly zone and local evaporation.
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