2016年梅雨期湖北地区三次暴雨过程对比分析  

Contrastive Analysis of Three Rainstorms in Hubei during the Meiyu Period

作　　者：尹韩笑 张立凤 杨雨轩 Yin Hanxiao;Zhang Lifeng;Yang Yuxuan(College of Meteorology and Oceanography,National University of Defense Technology,Nanjing 211101,China)

机构地区：[1]国防科技大学气象海洋学院,江苏南京211101

出　　处：《气象与减灾研究》2017年第4期292-301,共10页Meteorology and Disaster Reduction Research

基　　金：国家自然科学基金项目(编号:41375063)

摘　　要：针对2016年6月30日—7月6日梅雨期湖北省的持续性降水过程,根据降水融合资料识别出三段暴雨过程,基于高分辨率NCEP再分析资料分别从环流形势、水汽输送及上升运动等方面进行对比分析。结果表明,同一连续性梅雨期降水的三段暴雨过程,其环流形势明显不同,水汽输送与来源也不相同;温湿热力条件与上升运动强弱的动力条件共同影响降水强度,锋面的位置则与暴雨落区有密切的关系。第一段暴雨为典型的梅雨期暴雨环流,水汽主要来源于南海和孟加拉湾,热力不稳定与上升运动均较强,导致降水强度最强;第二段暴雨中,横槽将南海的水汽输送至湖北地区,较弱的热力不稳定度和上升运动导致降水强度偏弱;第三段暴雨发生在横槽减弱、西太平洋副热带高压北抬的过程中,湿度条件较差导致其降水强度较弱。Based on the high resolution NCEP reanalysis data and precipitation fusion data,the circulation situation,water vapor transport and vertical movement were discussed of three rainstorm processes in Hubei province during June 30 to July 6,2016.The results showed that the circling situations,the water vapor transportation and sources of the three rainstorms during the same Meiyu period were obviously different.The intensity of precipitation was affected by the thermal and dynamic conditions of the ascending movement.The location of the front was closely related to the heavy rainfall area.The first rainstorm had the typical torrential rain circulation characteristic of Meiyu period.The water vapor mainly originated from the South China Sea and Bay of Bengal,the thermal instability and rising movement were strong,which caused the strongest precipitation intensity.During the second heavy rain,the water vapor in the South China Sea was transported to Hubei by horizontal trough,and the weaker thermal instability and rising movement resulted in weaker precipitation.While during the third heavy rainfall,horizontal troughs were weakening and the west Pacific subtropical high moved northward,thus the poor humidity conditions led to weaker precipitation.

关 键 词：暴雨 环流形势 动力条件 热力条件 梅雨期 

分 类 号：P458[天文地球—大气科学及气象学]