2019年超强台风“利奇马”引发浙江特大暴雨过程分析  

Analysis of rainstorm caused by super typhoon “Lekima” in Zhejiang Province of 2019

作　　者：刘晓汝 谢作威[2] LIU Xiaoru;XIE Zuowei(Huangyan Meteorological Bureau,Zhejiang Taizhou,318020,China;Institue of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China)

机构地区：[1]黄岩区气象局,浙江台州318020 [2]中国科学院大气物理研究所,北京100029

出　　处：《气象科学》2020年第1期89-96,共8页Journal of the Meteorological Sciences

基　　金：国家自然科学基金资助项目(41875078; 41861144014);台州市科技计划项目(1902gy03);台州市气象局科技计划项目(TZ2019Y)

摘　　要：利用NCEP FNL 0.25°×0.25°的再分析资料和浙江省中尺度气象站降水资料,从产生强降水的条件来对“利奇马”特大暴雨过程进行诊断分析。结果表明:(1)强降水主要集中在近台风中心的西南部分及其稍远的北部,其中近台风中心为眼壁降水,北部为螺旋云带降水;(2)850~925 hPa水汽通量辐合中心与暴雨落区一致,水汽辐合强度差异是造成台风眼壁强降水落区差异的关键;(3)台风强度大时近中心上升运动强烈,正垂直螺旋度中心值的减小和中心下降对应强降水的发生,低层正螺旋度和高层负螺旋度中心的重叠区对对流性降水落区有一定的指示;(4)本次过程地形增益最明显地区在台州北部,在水汽条件处于劣势情况下出现降水副中心。The reanalysis data of NCEP FNL 0.25°×0.25°and the precipitation data of Zhejiang mesoscale meteorological stations are used for the diagnostic analysis on“Lekima”rainstorm.The results are as follows:(1)Heavy rainfall is mainly in the southwest part of the near typhoon center and the north part,which is slightly far from it,with the eye wall precipitation near the typhoon center and the spiral cloud belt precipitation in the north part.(2)The large-value area of the 850 hPa to 925 hPa water vapor flux convergence is consistent with the actual heavy rainfall area,and the difference in intensity of water vapor convergence is the key to the difference in the areas of the heavy typhoon eye wall precipitation.(3)The uplifting movement of the system near the typhoon center is strong while the typhoon is strong,the decrease of the central value of the positive helicity and the decrease of the center correspond to the occurrence of heavy precipitation,and the overlap between the low-level positive vertical helicity and the high-level negative vertical helicity center has certain indications to the convective precipitation.(4)The region with the most obvious topographic gain in this process is in the northern part of Taizhou,and the precipitation sub-centers appears even when the water vapor conditions are at a disadvantage.

关 键 词：台风 水汽通量散度 垂直螺旋度 地形 

分 类 号：P458.1[天文地球—大气科学及气象学]