| 重庆市2013年10-12月大气降水中氢氧同位素特征及水汽来源分析 |
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| 引用本文： | 胡菡,王建力.重庆市2013年10-12月大气降水中氢氧同位素特征及水汽来源分析[J].中国岩溶,2015,34(3):247-253. |
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| 作者姓名： | 胡菡 王建力 |
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| 作者单位： | 1.西南大学地理科学学院 |
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| 基金项目： | 国家自然科学基金（40971122）；重庆市自然科学基金（CSTS，2007BB7346） |
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| 摘 要： | 文章对重庆市北碚区西南大学2013年10-12月间降水进行收集并测试样品中δD、δ18O值，得到重庆大气降水线方程δD= 8.19δ18O +17.39，r=0.97（p<0.01）；发现该地区降水中δ18O与气温、降水量之间存在反温度效应、降雨量效应，但两种效应表现较弱。该地区10-12月大气水汽中的同位素组成复杂，场降水中δD、δ18O的变化受天气因素影响大。为了探明水汽输送过程中δD和δ18O变化，采用HYSPLIT模式追踪并验证该地区场降水的水汽输送轨迹，发现该时段西南季风较弱，主要受西风影响，10、11月水汽主要来源于中国横断山区三江流域，测试表明11月存在台风海燕的水汽输送记录，不同水汽来源对δD、δ18O的影响较大、响应值较好，12月主要来自局地的水汽蒸发。
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| 关 键 词： | 氢氧同位素 HYSPLIT模式 水汽来源 水汽输送轨迹 重庆北碚 |
Characteristics of hydrogen and oxygen isotopes in precipitation from october to december 2013 in Chongqing and analysis of moisture sources |
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| HU Han and WANG Jian-li.Characteristics of hydrogen and oxygen isotopes in precipitation from october to december 2013 in Chongqing and analysis of moisture sources[J].Carsologica Sinica,2015,34(3):247-253. |
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| Authors: | HU Han and WANG Jian-li |
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| Institution: | 1.School of Geographical Sciences, Southwest University2.School of Geographical Sciences, Southwest University/Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment， Ministry of Education |
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| Abstract: | Based on monitoring data and meteorological elements at School of Geographical Sciences，Southwest University of Chongqing，which were collected from October to December 2013, the LMWL of Chongqing is formulated as δD= 8.19δ18O+17.39，r=0.97（p<0.001). The influence of short-term weather factors accounts for the larger slope and intercept value of the LMWL. The characteristics of the hydrogen isotope and oxygen isotope and their relationships with temperature and precipitation were analyzed to reveal the moisture sources based on the statistics. The statistics shows that the relationships between hydrogen isotope and oxygen isotope are not obvious. Further study suggests that the co-existence of summer monsoon and winter monsoon during the transition span from October to December complicated isotope composition in precipitation. Then by virtue of HYSPLIT modeling，the vapor transport trajectories of every precipitation in Beibei of Chongqing during October to December 2013 are drawn.The resalts show that south-west monsoon was weak and the weather was affected mainly by westerlies in this period. The moisture sources of October and November 2013 were mainly from the Sanjiang drainage in the Hengduan Mountains，and there was moisture transport from tropical storm Haiyan in November. Different moisture sources have great influence to δD and δ18O,and the value of δD and δ18O have good respond to the different source.While moisture source of rain in December 2013 was mainly from local evaporation. |
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