广西地区一次强冰雹过程形成机制分析  

Mechanism Analysis of a Severe Hailstorm Process in Guangxi

作　　者：孙莹[1] 寿绍文[2] 沈新勇[2] 刘泽军[3] 熊文兵 

机构地区：[1]广西桂林市气象局,广西桂林541001 [2]南京信息工程大学江苏省气象灾害重点实验室,江苏南京210044 [3]广西气象减灾研究所,广西桂林530022 [4]广西气象科技服务中心,广西桂林530022

出　　处：《高原气象》2008年第3期677-685,共9页Plateau Meteorology

基　　金：国家自然科学基金项目(40405009,40575022,40205008);江苏省气象局科技开发项目(200406);江苏省气象灾害重点实验室项目(KLME050201);国家重点基础研究发展规划项目(2004CB418301);江苏省自然科学基金项目(BK2005141);广西气象局重点攻关项目(QK200603)共同资助

摘　　要：利用NCEP再分析资料、MM5数值模拟资料和多普勒雷达产品，对广西北部2006年4月9～10日的一次强冰雹过程进行动力诊断分析。结果表明，强对流过程发生前期存在的暖干盖，为对流有效位能CAPE的积蓄提供了有利条件。中低层风切变的增加，促进了高低层能量的交换，揭开暖干盖，触发了强对流的爆发。高层位涡的向下输送，引起了低层涡度的变化，形成了低层辐合高层辐散，使得强对流过程得以维持和发展。强对流风暴强中心位于500hPa以上，低层存在弱回波区，风暴中心的上升从低层到高层发生倾斜，并且沿顺时针方向旋转。Based on the NCEP reanalyzed data, MM5 numerical simulation data and the Doppler radar products, a severe hailstorm process occurred in north of Guangxi Province of China on April 9- 10, 2006 was analyzed. The results indicate that the dry and warm lids existed previously to the severe convection process is favorable to storing of the convective available potential energy （CAPE）. The increase of vertical wind shear promoted the exchanges of the upper and lower levels to unveil the dry and warm lids, to trigger the convection. The downward transportion of the potential vorticity of upper level cause the lower level vorticity changes, and lead to the convergence of lower level and divergence of upper level, it keeps and strengthens the strong convection. The severe convection storm center is located above 500 hPa, there is a weak echo on the lower level. Storm center ascended incline and whirl clockwise from lower level to upper level.

关 键 词：广西地区 冰雹 暖干盖 风切变 位涡 

分 类 号：P458.121.2[天文地球—大气科学及气象学]