Detecting the Origins of Moisture over Southeast China:Seasonal Variation and Heavy Rainfall

作     者：Xiuzhen LI Wen ZHOU Yongqin David CHEN 

作者机构：Department of Geography and Resource ManagementThe Chinese University of Hong Kong Guy Carpenter Asia–Pacific Climate Impact CentreSchool of Energy and EnvironmentCity University of Hong Kong Department of Geography and Resource Managementand Institute of EnvironmentEnergy and SustainabilityThe Chinese University of Hong Kong 

出 版 物：《Advances in Atmospheric Sciences》 (大气科学进展（英文版）)

年 卷 期：2016年第33卷第3期

页      面：319-329页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：financially supported by the National Nature Science Foundation of China(Project Nos.41175079,41405045 and 41375096) Research Grants Council of the Hong Kong Special Administrative Region,China(Project No.CUHK441313) 

主　　题：moisture origin Southeast China HYSPLIT seasonal variation heavy rainfall 

摘      要：To examine the ability of the Hybrid Single-Particle Lagrangian Integrated Trajectory （HYSPLIT） model to detect the origins and paths of moisture supplied to Southeast China, trajectories of air particles released over Southeast China were traced backward during 1 April 2012 to 31 March 2013 and three typical regional persistent heavy rainfall events. The HYSPLIT model provides more insightful information than water vapor flux. Analysis of the specific humidity along the trajectories revealed the origins of moisture and their contributions to the moisture supply in Southeast China. In the boreal summer half year, four key moisture transport paths from the eastern Indian Ocean, central Indian Ocean, South China Sea （SCS）, and western North Pacific （WNP） contribute 10%, 20%, 31%, and 16% of the moisture to Southeast China, respectively. In the winter half year, the contributions of the paths from the WNP and North China double. Examination of heavy rainfall events showed that under tropical storm conditions, all moisture transport routines are rotated cyclonically before reaching Southeast China. The invasion of cold air can trigger heavy rainfall in both the summer and winter half years but plays different roles： it does not contribute to the moisture supply but plays a key role in converging and uplifting the moisture in the summer half year, while it supplies a great amount of moisture in the winter half year as it absorbs abundant moisture in crossing the WNE