东北冷涡暴雨过程中干侵入特征及其与降水落区的关系  

Dry Intrusion's Feature and Its Relationship with Rainfall Regions on Cold Vortex Heavy Rain Process in Northeast China

作　　者：吴迪[1,2] 寿绍文[3] 姚秀萍[2,4] 

机构地区：[1]南京信息工程大学大气科学学院,南京210044 [2]中国气象科学研究院灾害天气国家重点实验室,北京100081 [3]南京信息工程大学江苏省气象灾害重点实验室,南京210044 [4]中国气象局公共气象服务中心,北京100081

出　　处：《暴雨灾害》2010年第2期111-116,共6页Torrential Rain and Disasters

基　　金：中国气象科学研究院灾害天气国家重点实验室2008年开放基金(2008LASW-B06);中国气象局武汉暴雨研究所2008年度暴雨研究开放重点基金项目;国家自然科学基金项目(40875030;40875025)共同资助

摘　　要：利用NCEP/NCAR1°×1°再分析资料、FY-2C卫星资料及常规气象观测资料,对一次典型东北冷涡暴雨过程中干侵入特征及其对东北冷涡暴雨发生发展的作用机制进行分析。结果表明,干侵入在卫星水汽图像上明显,为暗区,该暗区与大气动力场有较好的配置,与350hPa位涡高值区分布一致;干侵入区是高位涡和低湿的重叠区,干侵入前沿为降水落区,表明了干侵入与强降水落区存在密切联系;对流层高层低湿、高位涡的冷空气下传有利于冷涡暴雨的发生发展,暴雨强度随着干侵入强度增强而增大。同时冷平流效应非常重要,其对干侵入强度指数的变化起到主要作用。Based on the NCEP/NCAR 1°×1° reanalysis data, FY-2C satellite data and conventional meteorological observations, the characteristics of the dry intrusion and its impacts on the formation and development of the cold vortex heavy rain during 20- 24 July, 2006 are analyzed. The results show that the dry intrusion is a dark and obvious zone on the water vapor image. The dark zone has a better correspondence with the dynamic field corresponding with the distribution of the high potential vorticity at 350 hPa. Dry intrusion area is the overlap of both high potential vorticity and low humidity. Forefront of the dry intrusion is the rainfall regions, which indicates that the dry intrusion has a close relationship with strong rainfall regions. The downward cold air characterized by high potential vorticity and low humidity in the upper troposphere enhances the development of cold vortex heavy rain. The cold vortex heavy rain increases with an increasing intensity of dry intrusion. Meanwhile, the cold advection plays a very important role in variation of DII.

关 键 词：东北冷涡 暴雨 干侵入 降水落区 

分 类 号：P458.121.1[天文地球—大气科学及气象学]