环境风垂直切变对0908号台风“莫拉克”影响的分析  

Effects of Environmental Vertical Wind Shear on Typhoon Morakot (0908)

作　　者：李瑞[1] 吕淑琳 周春珍[1] 梁永礼[1] 刘爱梅[1] 郭渠[2] 卓鸿[3] 

机构地区：[1]济南市气象局,山东济南250002 [2]重庆市气候中心,重庆401147 [3]中国气象科学研究院灾害国家重点实验室,北京100081

出　　处：《海洋科学进展》2011年第3期307-313,共7页Advances in Marine Science

基　　金：国家重点基础研究发展计划项目--台风登陆前后结构和强度突变机理研究(2009CB421504);国家自然科学基金项目--登陆台风强度变化机理研究(40730948);国家自然科学基金项目--台风远距离暴雨的形成机理研究(40975032)

摘　　要：利用多种卫星观测资料和NCEP/NCAR提供的风场资料等,分析环境风垂直切变对0908号台风"莫拉克"的强度、对流和降水结构的影响。结果表明:环境风垂直切变不是影响"莫拉克"强度变化的直接因素。"莫拉克"登陆前,在较强环境风垂直切变作用下,最大对流和降水区域均位于顺切变方向左侧,降水呈一阶非对称分布。"莫拉克"登陆后,在较弱环境风垂直切变作用下,最大对流区域出现在顺切变方向右侧距台风中心较远处。The satellite observation data from various sources and the wind field data from NCEP/NCAR are used to analyze effects of environmental vertical wind shear on intensity, convection and precipitation structures of Typhoon Morakot （0908）. It is shown in the results that environmental wind vertical shear is not a direct acting factor for Morakot＇s intensity variability. Before the Morakot＇s landfall, the strongest convection and precipitation area is located to the left of the down-shear direction and the precipitation has a first order asymmetric distribution under the action of the strong wind shear. After the Morakot＇s land-fall, the strongest convection area is to the right of the down-shear and further away from the Morakot＇s center under the action of the weak wind shear.

关 键 词：台风“莫拉克” 强度 对流和降水结构 环境风垂直切变 

分 类 号：P732[天文地球—海洋科学] P444