理想地形下不同云微物理方案对登陆台风降水增幅影响的数值研究  

Numerical study on impact of different cloud microphysical schemes on precipitation enhancement of landfalling typhoon under ideal topography

作　　者：曾智华[1] 管靓 陈联寿[3] 高志球[4] 李煜斌[5] ZENG Zhihua;GUAN Liang;CHEN Lianshou;GAO Zhiqiu;LI Yubin(Shanghai Typhoon Institute, CMA, Shanghai 200030, China;Shanghai Marine Meteorological Center, Shanghai 200030, China;Chinese Academy of Meteorological Sciences, Beijing 100081, China;Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;Nanjing University of Information Science & Technology, Nanjing 210044, China)

机构地区：[1]中国气象局上海台风研究所,上海200030 [2]上海海洋气象台,上海200030 [3]中国气象科学研究院,北京100081 [4]中国科学院大气物理研究所,北京100029 [5]南京信息工程大学,江苏南京210044

出　　处：《海洋气象学报》2020年第4期22-32,共11页Journal of Marine Meteorology

基　　金：国家重点研发计划“重大自然灾害监测预警与防范”重点专项(2018YFC1506405);国家自然科学基金项目(41975067,41275067,41575108)。

摘　　要：利用WRF(Weather Research and Forecasting)模式,在理想岛屿地形条件下设计了云的微物理冰相过程中水凝物中有霰和无霰的两个对比试验,考察了台风登陆时复杂冰相和简单冰相对台风移动路径、强度和降水增幅的影响。结果表明:1)云微物理过程中有霰的复杂冰相过程时,具有更强烈的云“播撒”效应,因而对台风降水具有明显增幅作用。2)当台风受到理想地形作用时,地形对云“播撒”效应引起的增幅作用具有放大作用,此时台风眼墙非绝热加热量形成明显增强中心,使得台风降水增幅明显。3)当台风登陆时,云微物理冰相过程使得台风越山时存在向西北指向的涡度变化倾向。Using the WRF(Weather Research and Forecasting)model,different impacts of complex ice phase and simple ice phase on the typhoon track,intensity,and precipitation enhancement when typhoon makes landfall are investigated based on two comparative experiments with or without graupel in hydrometeor during the microphysical ice-phase process under the ideal island topography.The results show the complex ice-phase process with graupel in the cloud microphysical process has a stronger seeder-feeder effect of the cloud,which has a significant enhancement on typhoon precipitation.When typhoon experiences the ideal topography,it increases the enhancement effect of precipitation caused by the seeder-feeder mechanism of the cloud.The diabatic heating of the typhoon eye wall in the lower layer forms a significant enhancement center,which makes the typhoon precipitation increase significantly.When typhoon lands and crosses mountains,the cloud microphysical ice-phase process causes the vorticity tendency to point to the northwest.

关 键 词：台风 理想地形 云微物理过程 降水增幅 

分 类 号：P456.7[天文地球—大气科学及气象学] P457.8