台风“古超”环流影响下闽东大暴雨物理量诊断分析  

Diagnostic Analysis of Physical Variables of Rainstorm in Eastern Fujian under the Influence of Typhoon Guchol Circulation

作　　者：李碧寒 张翔宇 林冰 LI Bihan(Ma’anshan Meteorological Bureau,Ma Anshan,Anhui 243000)

机构地区：[1]安徽省马鞍山市气象局,安徽马鞍山243000 [2]福建省宁德市气象局,福建宁德352100 [3]福建省福州市预警信息发布中心,福建福州350000

出　　处：《农业灾害研究》2022年第6期113-115,共3页Journal of Agricultural Catastrophology

摘　　要：利用NCEP全球再分析资料、常规天气观测资料、雷达拼图等资料,对2017年9月7—8日“古超”台风影响下宁德一次强降水天气过程进行分析。结果表明:中纬度槽东移,引导弱冷空气扩散南下,与“古超”环流北侧的东南暖湿气流交汇有利于触发强对流的发生发展;K指数普遍大于37.5℃,高层的干冷空气,低层的高能高湿区,温度垂直递减率较大,大气层结不稳定度较高,具备了较好的强对流触发条件;高层辐散、低层辐合形成的抽吸作用,一方面提供了良好的动力抬升条件,另一方面有利于低层水汽的强烈汇合。Based on NCEP global reanalysis data,conventional weather observation data and radar puzzle data,this paper diagnosed a heavy precipitation weather process in Ningde under the influence of typhoon Guchol on September 7~8,2017.The results show that:Cold air spreads southward due to the eastward shift of the mid-latitude trough and intersects with the warm and humid southeast airflow north of the“Typhoon Guchol”circulation,which is conducive to triggering the development of strong convection;The K index is generally greater than 37.5℃.Dry and cold air at higher levels,high energy and high humidity zones at lower levels,large vertical rate of temperature decreases,and high atmospheric laminar instability all provide better conditions for strong convective triggers.The High-level divergence and Low-level convergence can form the pumping effect,which provides good power lifting conditions on the one hand,and facilitates the strong convergence of low level water vapor on the other hand.

关 键 词：强降水 冷空气 热带低压 

分 类 号：P458.121.1[天文地球—大气科学及气象学]