台风“利奇马”引发山东极端降水过程分析  

Analysis on the Process of Extreme Precipitation in Shandong Province Caused by Typhoon Lekima

作　　者：黄文彦[1] 姚丽娜[1] 李斌 温静 吴晶璐 Huang Wenyan;Yao Lina;Li Bin;Wen Jing;Wu Jinglu(Changzhou Meteorological Office of Jiangsu Province,Changzhou 213022,China)

机构地区：[1]常州市气象局,江苏常州213022

出　　处：《气象与环境科学》2024年第3期38-47,共10页Meteorological and Environmental Sciences

基　　金：江苏省气象局科研基金面上项目(KM202208);江苏省气象局科研基金青年项目(KQ202214)。

摘　　要：利用NCEP-GFS再分析资料,对2019年1909号台风“利奇马”8月10-11日在山东产生极端强降水过程展开分析,并与相似路径台风“安比”进行对比,结果表明:强辐合区和急流的长期维持是极端强降水的直接原因。风场和温度场的不对称性有利于暖湿气流在山东中部长期维持。冷暖平流在山东中部即台风倒槽处交汇,导致台风倒槽内锋生函数的大值区长期维持。冷空气从台风的西侧和南侧侵入,并没有很快破坏台风东北侧气流的暖湿特性。水汽图像能直观地反映出冷空气向东侵入的连续过程。850 hPa水汽通量强辐合区集中在山东中部,为极端降水的出现提供水汽条件。相似路径台风“安比”风场辐合中心强度、锋生强度、水汽通量辐合中心强度远不及“利奇马”的强度,这些都导致类似“安比”的一般台风过程造成山东的降水强度远弱于“利奇马”造成的降水强度。Using NCEP-GFS reanalysis data,this article analyzes the process of how 1909 Typhoon Lekima produced extremely severe precipitation in Shandong Province in August 1011,2019,and compares it to Typhoon Ampil which had in a similar track with Lekima.The results show that the long-time maintenance of the strong convergence and jet stream were the direct cause for the extreme precipitation.Wind and temperature field were asymmetry,leading to the long-time maintenance of warm and humid airflow in the central part of Shandong.The cold and warm advections converged in the inverted trough of the Typhoon Lekima in central Shandong,resulting in the long-time maintenance of the large value area of the frontogenesis function in the inverted trough of the typhoon.The cold air invaded from the west and south sides of the typhoon,without quickly destroying the warm and humid characteristics of the airflow on the northeast side of the typhoon.The water vapor image can intuitively reflect the continuous process of the cold air’s intruding eastward.The strong convergence area of water vapor flux at 850 hPa was concentrated in the central part of Shandong,providing water vapor conditions for the emergence of extreme precipitation.In contrast,the intensities of wind convergence center,frontogenesis,and convergence center of water vapor flux of the similar-path Typhoon Ampil were greatly weaker than those of Lekima.Therefore,the precipitation intensity caused by Typhoon Ampil and other similar typhoon processes was much weaker than that of Lekima in Shandong.

关 键 词：利奇马 非对称性 等熵位涡 锋生 水汽图像 

分 类 号：P458.3[天文地球—大气科学及气象学]