摘要
文章利用常规观测资料,对北上台风“梅花”进行诊断分析,结果表明:高空急流的抽吸作用提供了大尺度的水汽抬升条件,副热带高压的阻挡作用导致降水持续时间超长;前24 h倒槽稳定少动,触发中尺度系统并产生列车效应,暖湿切变与低空急流出口区的辐合是直接动力来源,叠加山脉地形强迫,导致暖湿空气强烈辐合抬升,此阶段水汽来自台风倒槽;后24 h“梅花”移入西风槽,冷空气侵入有利于斜压锋生,大尺度动力抬升作用加强,此阶段水汽来自14号台风“南玛都”;EC模式对强降水有一定指示意义但稳定性较差。
The article uses conventional observation data to diagnose and analyze the northward typhoon"Meihua".The results show that the suction effect of the high-altitude jet provides conditions for large-scale water vapor uplift,while the blocking effect of the subtropical high pressure leads to prolonged precipitation duration.In the first 24 hours,the inverted trough remained stable with little movement,triggering a mesoscale system and generating a train effect.The convergence of warm and humid shear and low-level jet stream exit zones was the direct source of power,coupled with mountain terrain forcing,resulting in strong convergence and uplift of warm and humid air.During this stage,water vapor came from the typhoon inverted trough.In the next 24 hours,"Meihua"moved into the westerly trough,and the intrusion of cold air was conducive to the formation of oblique pressure fronts,strengthening the large-scale dynamic uplift effect.At this stage,the water vapor came from Typhoon Nanmadu No.14.The EC model has a certain indicative significance for heavy precipitation,but its stability is poor.
作者
张彤
崔忠强
王传贺
王智宇
Zhang Tong;Cui Zhongqiang;Wang Chuanhe;Wang Zhiyu(Tonghua Meteorological Bureau,Tonghua 134001)
出处
《气象水文海洋仪器》
2024年第6期89-91,共3页
Meteorological,Hydrological and Marine Instruments
基金
吉林省气象局科研课题“通化、四平两市强对流天气预报指标研究”(201731)资助。
关键词
台风
大暴雨
倒槽
水汽
数值预报
typhoon
heavy rainstorm
inverted trough
water vapor
numerical prediction
