摘要
利用常规观测资料、NCEP再分析资料对台风"山神"和"海燕"天气过程进行分析得出:两个台风后期东折路径不同,台风"山神"先后受孟湾槽东移以及西风槽加深东移及高原槽移出致副高减弱东退南落引起,"海燕"则是孟湾槽东移副高减弱东南斜造成;"山神"停编前在广西是单一的暖云降水,停编后其残余环流与南下的冷空气相互影响引起桂东强降雨,"海燕"影响广西时恰好冷空气南下,两者结合降雨增幅造成广西大范围暴雨天气;散度场涡度场表明"海燕"抽吸作用比"山神"强得多,水汽辐合量两者相当,但辐合高度"海燕"更高;水平风垂直切变"海燕"比"山神"小得多,小的垂直切变有利于雨区集中,使降雨强度增大。
Based on conventional observation data and NCEP reanalysis data of typhoon ＂ Son-Tinh＂ and ＂ haiyan＂ weather process analysis, it is concluded that： the late paths of two typhoon folding to east are different, the path of typhoon ＂ Son-Tinh＂ which result in successive influence of east trough of Bengal bay, west wind trough deepened eastward and removing of high plateau trough, the path of ＂ haiyan＂ , which result in Bengal bay trough east southeast weakened and subtropical high inclining; Before stopping the knitting ＂ Son-Tinh in guangxi is single warm cloud precipitation, after that residual circulation and its southward cold air influence each other cause the heavy rainfall, When ＂ haiyan＂ is in Guangxi, cold air is southward, widespread storm weather was caused by the combination of these two situation; Divergence field and vorticity field showed that suction effect of ＂ haiyan＂ is much better than ＂ Son-Tinh ＂ , both of the amount of water vapor convergence is fairly, but convergence height of ＂ haiyan＂ is higher; Horizontal wind vertical shear of ＂ haiyan＂ is less than the ＂ Son-Tinh ＂ , this can increase the rainfall intensity.
出处
《气象研究与应用》
2014年第2期7-13,39,共8页
Journal of Meteorological Research and Application
基金
中国气象局预报员专项项目"冷空气影响下台风‘海燕’路径和强度特征分析"(CMAYBY2014-049)
关键词
台风暴雨
副热带高压
冷平流
水平风垂直切变
typhoon rainstorm
subtropical high
cold advection
the vertical shear of level wind
