Use of stable isotopes of water for water cycle study

1)吉隆流域水文研究对吉隆流域（大津、志贺）的降水、土壤水、地下水、植物水、泉水和溪水进行了稳定同位素组成测定。从这些数据中，获得了地下水充放过程的资料。2)讨论了西伯利亚、西藏和东南亚降水采样网络，以更好地了解水循环。在西伯利亚和西藏的几个地点已经开始了降水取样。采样间隔对于获取具有不同时间和空间信息的信息非常重要。短间隔（5 ~ 10min）的资料包括云内或云周围降水过程的资料。每日资料有降水过程和水汽来源的资料。3)将同位素模式推导为大气环流模式进行了改进。水蒸气同位素组成垂直剖面的模拟结果与人们所认为的有有趣的不同。

1) Hydorologycal Research in Kiryu watershedStable isotopic compositions of water were measured for precipitation, soil water, groundwater, water in plants, spring water and stream water taken in Kiryu watershed (Otsu, Shiga Prefecture). From those data, information on the charge and discharge processes of groundwater were obtained.2) Network on precipitation sampling in Siberia, Tibet and SE AsiaSampling network was discussed for better understanding of water cycle. Precipitation samplings have been started at several sites in Siberia and Tibet. Sampling interval is important for obtaining the information with various time and spatial information. Data with short interval (5 to 10min) include the information on precipitation process in or around clouds. Daily data have information on the precipitation process and also origin of water vapor.3) Isotope model derived into atmospheric general circulation model was improved. Simulated results on the vertical profile of isotopic composition of water vapor was interestingly different from what has been believed.