台风“卢碧”变性增强过程的诊断研究  

Diagnostic study on the reintensification of typhoon Lupit undergoing extratropical transition

作　　者：卓鹏 王举 黄泓 王学忠 ZHUO Peng;WANG Ju;HUANG Hong;WANG Xuezhong(Unit 91954 ofPLA,Hunan Yongzhou 425000,China;College of Meteorology and Oceanography,National University of Pefense Technology,Nanjing 211101,China)

机构地区：[1]解放军91954部队,湖南永州425000 [2]国防科技大学气象海洋学院,南京211101

出　　处：《气象科学》2018年第3期310-319,共10页Journal of the Meteorological Sciences

基　　金：国家自然科学基金资助(41375049;40905021;41275099); 中国博士后科学基金(2011M500894)

摘　　要：利用日本气象厅JRA再分析资料和台风最佳路径资料以及TRMM降水资料,对0920号台风"卢碧"变性过程的环流形势、高低层热力异常和锋生锋消等特征进行了分析研究。结果表明,"卢碧"的变性是中高纬度冷空气入侵的结果,变性过程伴随着西风槽的东移,高空急流的加强以及西太平洋副热带高压的减弱东撤。低纬度暖湿气流及较大的正涡度异常气旋式卷入台风环流,并在其东北侧积聚产生大量降水,释放的凝结潜热有利于北侧脊的加强,使得高空急流进一步加强,使得台风中心气压进一步降低。锋生、强降水伴随的潜热释放以及气旋中心气压之间存在着正反馈效应是"卢碧"变性后得以增强再发展的主要原因。热成风涡度梯度的分布对"卢碧"的变性增强过程具有较好的指示意义。By using the data of JRA reanalysis and best track from Japan Meteorological Agency and Tropical Rainfall Measuring Mission（ TRMM） Satellite,the Extratropical Transition（ ET） process of No. 0920 typhoon ＂Lupit＂was analyzed in the aspects of circulation feature,thermodynamic anomaly at high-and-low levels and the frontogenesis. The results show that the ET of ＂Lupit＂was caused by the invasion of cold air from middle-high latitude. It accompanies with eastern movement of west-wind trough,enhancement of upper-level jet stream and weakness and eastern-retreat of western pacific subtropical high. Warm and wet air at low latitudes and positive vorticity abnormal is involved into typhoon current and accumulates in north-east,so that a large number of rainfall happens. Latent heat of condensation from rainfall is benefit for northern-ridge and upper-level jet stream to reinforce,so that center pressure of typhoon reduces further. Feedback between frontogenesis,latent heat release of rainfall and pressure in the center of cyclone is the main reason for ＂Lupit＂to reintensification after ET. The gradient of thermal wind vorticity indicates the ET and intensification of Lupit well.

关 键 词：热带气旋 变性 相空间 锋生函数 高空槽 

分 类 号：P458.124[天文地球—大气科学及气象学]