摘要
[目的]分析0906台风"莫拉菲"影响期间广西的暴雨落区。[方法]针对0906台风"莫拉菲"登陆后在广西南部和中部出现强降水落区,分别分析了500 hPa环流、物理量场、卫星云图和地形作用等因素。[结果]500 hPa副高造成了"莫拉菲"环流非对称性,对广西的强降水落区起到关键作用。物理量场分析指出,"莫拉菲"登陆后,水汽辐合中心在广西东南部,为此次广西南部和中部的强降水提供了充足的水汽条件;广西南部和中部中低层出现长时间的最大正涡度中心,对应200、700 hPa分别出现最大散度、辐合中心,高层辐散、低层辐合为该区域强降水创造了条件。从卫星云图看,此次强降水落区是与"莫拉菲"呈现出的非对称性结构分不开的。此外,地形抬升作用有利于大降水的发生。[结论]该研究为今后此类强降水的防灾减灾提供了参考。
[Objective] The research aimed to analyze falling zone of the rainstorm in Guangxi during influence period of the 0906 typhoon ＂Molave＂.[Method] By 500 hPa circulation,physical quantity field,satellite cloud chart and terrain effect,formation reason of the strong precipitation falling zone in southern and central parts of Guangxi after 0906 typhoon ＂Molave＂ landed was analyzed.[Result] 500 hPa subtropical high caused asymmetry of the ＂Molave＂ circulation,playing a key role in falling zone of the strong precipitation in Guangxi.Physical field analysis pointed out that after ＂Molave＂ landed,water vapor convergence center was in southeast Guangxi,providing adequate moisture condition for strong precipitation in southern and central parts of Guangxi.The maximum positive vorticity center appeared at the middle and low layers in southern and central parts of Guangxi for a long time.At 200 hPa,there was a maximum divergence center.At 700 hPa,there was a maximum convergence center.High-level divergence and low-level convergence created conditions for heavy precipitation in the region.From satellite cloud chart,falling zone of the strong precipitation closed to asymmetric structure of the ＂Molave＂.In addition,terrain elevation was conducive to occurrence of the large precipitation.[Conclusion] The research provided reference for disaster reduction and prevention of this kind of strong precipitation.
出处
《安徽农业科学》
CAS
2012年第12期7262-7264,7279,共4页
Journal of Anhui Agricultural Sciences
基金
广西气象科学研究与技术开发项目(桂气科200904)
关键词
台风暴雨
副热带高压
非对称结构
物理量场
卫星云图
地形作用
Typhoon rainstorm
Sub-tropical high pressure
Asymmetric structure
Physical quantity field
Satellite cloud chart
Terrain effect
