江苏北部一次由MCC引发的致洪暴雨综合分析  

Analysis of Flooding Rainstorm Caused by MCC Over North Jiangsu Province

作　　者：井喜[1,2] 范丛勇 王雄[4] 万宏卫 兰新哲 

机构地区：[1]中国气象科学研究院灾害天气国家重点实验室,北京100081 [2]陕西省榆林市气象局,榆林719000 [3]江苏省连云港市气象局,连云港2222006 [4]江苏省滨海县气象局,滨海224500 [5]陕西省榆林市人民政府,榆林719000

出　　处：《暴雨灾害》2009年第1期1-7,共7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基金项目"黄河中下游和淮河流域MCC致洪暴雨的研究"(2007LASW10)资助

摘　　要：利用卫星云图、NCEP资料和MICAPS系统提供的实况资料和物理量等,对2008年7月23日江苏北部一次中尺度对流复合体(MCC)和暴雨天气过程进行诊断分析。结果表明:MCC是造成暴雨的直接影响系统;200hPa中尺度反气旋环流的形成,配合500hPa西南急流左侧切变线生成以及边界层925hPa锋生与西南强风带或西南急流左侧中尺度低涡生成,有利于MCC生成和发展;925hPa以下边界层10.7m.s-1.km-1强风速垂直切变的形成,配合边界层正涡度中心生成、对流层高层辐散增强,是激发MCC生成和发展的动力机制;850hPa江苏中北部MPV1≤-0.5PVU的中尺度对流不稳定中心的生成,配合北方MPV2≥0.6PVU湿斜压场纬向高值带的生成和稳定,有利于江苏北部地区中尺度强对流系统重复出现和MCC生成发展。Using the synoptic data such as satellite image, Doppler radar and upper wind, the flooding rainstorm in the north area of Jiangsu province on July 23, 2008 caused by MCC is analyzed by large-scale environment field and physical quantity. MCC effects the rainstorm directly. The mesoscale anticyclogenesis at 200 hPa coupling with the mesoscale cyclone generating on the left side of the southwest low-level jet, frontogenesis at 925 hPa and southwest gale band or the mesoscale low vortex at the left side of the southwest jet stream are help to make MCC and develop cireumfluence. The strong vertical wind shear with 10.7 m.s^-1·km^-1 appears below 925 hPa, the formation of the positive vorticity center at the boundary layer and the divergence enhancing at the upper troposphere are the triggering mechanisms for MCC. The mesoscale convective instable center with MPV1≤ -0.5 PVU at 850 hPa on the middle-north area of Jiangsu province and the high value belt of the moist baroclinic over the north side of Jiangsu province are in favor of the generation and development of MCC and presenting the mesoscale system repetitionally.

关 键 词：MCC 致洪暴雨 综合分析 

分 类 号：P458.121.1[天文地球—大气科学及气象学]