热带风暴Bilis(2006)登陆期间一波非对称降水分布成因的探讨  

Causes of wave number-1 asymmetric rainfall distribution of tropical storm Bilis(2006) during its landfall

作　　者：石顺吉[1] 余锦华[1] 张大林[2] 

机构地区：[1]南京信息工程大学太平洋台风研究中心,KLME,大气科学学院,江苏南京210044 [2]美国马里兰大学大气海洋科学系,美国马里兰州20742-2425

出　　处：《热带海洋学报》2009年第1期34-42,共9页Journal of Tropical Oceanography

基　　金：国家自然科学基金项目(40775060);江苏省高校自然科学基础研究项目(07KJB170065);中国气象科学研究院灾害天气国家重点实验室2007年开放课题(2007LASW09)

摘　　要：利用中尺度数值模式WRF-ARW对Bilis(2006)进行数值模拟,并进行地形和下垫面因素2个敏感性试验,诊断分析Bilis(2006)登陆期间一波非对称降水结构形成的动力因子。综合分析3个试验,结果表明环境垂直风切变对Bilis(2006)一波非对称降水结构形成的影响显著大于地形、登陆过程下垫面属性的改变和风暴移动速度的影响,冷空气的侵入对降水形成也有重要贡献。垂直切变的作用使顺切变左侧形成强降水,冷空气的作用与垂直切变的作用相互配合可能是顺切变方向和顺切变方向右侧强降水的主要成因。The mesoscale numerical model WRF-ARW was used to simulate iment and two sensitivity experiments in which the effects of terrain and Bilis （2006） in a control experunderlying surface factor were studied. The dynamic factors to form wave number-1 asymmetric rainfall structure of Bilis （2006） during its landfall were diagnosed. The results of the three experiments were analyzed comprehensively to show that the influence of environmental vertical wind shear on wave number-1 asymmetric rainfall structure of Bilis was significantly more important than the terrain, change of underlying surface properties during landfall, and storm speeds. On the other hand, the intrusion of cold air also played an important role in forming local rainfall. Heavy rainfall formed in downshear left quadrant under the effects of vertical wind shear, while heavy precipitation appeared in downshear direction and downshear right quadrants due to vertical shear and the intrusion of modest cold air.

关 键 词：热带气旋 非对称降水 地形 环境垂直风切变 冷空气侵入 

分 类 号：P444[天文地球—大气科学及气象学] P426.61