中国降水同位素信息熵时空分布及其水汽输送示踪  

Spatial and temporal distributions of precipitation isotope information entropy to trace water vapor transport in China

作　　者：王涛[1] 陈建生[2] 严嘉恒 马芬艳 张茜 WANG Tao;CHEN Jiansheng;YAN Jiaheng;MA Fenyan;ZHANG Xi(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;School of Earth Sciences and Engineering,Hohai University,Nanjing 211000,China;School of Civil and Transportation,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]河海大学地球科学与工程学院,江苏南京211000 [3]河海大学土木与交通学院,江苏南京210098

出　　处：《水科学进展》2022年第4期581-591,共11页Advances in Water Science

基　　金：国家自然科学基金资助项目(42101021);中央高校基本科研业务费专项资金资助项目(B220201031)。

摘　　要：研究水汽输送过程有助于更好地理解极端降水发生过程。但是,降水系统的复杂性和降水同位素的随机性使得利用降水同位素示踪水汽输送过程具有较大的不确定性。利用信息熵研究了中国降水同位素组成概率分布特征,发现降水氢氧同位素信息熵之间呈现很强的线性关系,且斜率近似为1;对比分析了降水同位素信息熵和其平均值的时空分布特征,发现降水同位素信息熵空间分布可以很好地揭示水汽由海洋向大陆的运移过程,而这一特征并没有反映在降水同位素平均值空间分布上;利用降水同位素信息熵对影响中国的由季风形成的3条水汽通道进行了示踪分析,发现降水同位素信息熵空间分布很好地指示出3条水汽通道的水汽来源和水汽运移路径及其季节变化。Study on water vapor transport is beneficial for better understanding the process of extreme precipitation.However,the precipitation system is complex and precipitation isotopes exhibit randomness,which makes it large uncertainty to use precipitation isotopes to trace water vapor transport.Information entropy has been employed to study the probability distribution characteristics of precipitation isotopic compositions in China,and it shows a strong linear relationship between hydrogen and oxygen precipitation isotopic information entropies,with a slope that is close to one.The spatial and temporal distributions of precipitation isotope information entropy were compared with the mean value of precipitation isotopes.Results showed that the spatial distribution of precipitation isotopic information entropy can suitably reveal the movement of water vapor from the ocean to continents,but this feature is not reflected by the spatial distribution of the mean value of precipitation isotopes.Precipitation isotope information entropy was applied to trace the three moisture corridors driven by monsoon system in China.Results showed that the spatial distribution of precipitation isotope information entropy can accurately reflect the vapor source and movement of the three moisture corridors and their seasonal changes.

关 键 词：降水同位素 信息熵 水汽输送 时空分布 水文气象 

分 类 号：P339[天文地球—水文科学]