“龙王”(LONGWANG)台风过程湿位涡的诊断分析  

THE DIAGNOSTIC ANALYSIS OF “LONGWANG” TYPHOON

作　　者：赖绍钧 何芬[2] 赵汝汀 沈桐立[3] 吴启树 

机构地区：[1]福州市气象局,福州350014 [2]福建省气象局,福州35000 [3]南京信息工程大学大气科学系,南京210044

出　　处：《气象科学》2007年第3期266-271,共6页Journal of the Meteorological Sciences

基　　金：国家重点基础研究项目(编号:2004CB418301)资助

摘　　要：本文应用MM5V3中尺度数值模式对0519号台风“龙王”过程进行了数值模拟,利用模拟结果计算了台风过程湿位涡(Moist Potential Vorticity,MPV)的演变,从湿位涡的角度研究了台风过程大暴雨的产生机制。结果表明:倾斜涡度发展是“龙王”台风在福建沿海产生大暴雨的重要机制之一,湿位涡能够对暴雨落区的预报有较强的指示性作用,暴雨产生在θse线陡立的对流层中低层MPV1等值线密集带中零线附近,对流层中高层的MPV2负值区可以作为暖湿气流或涡旋活动的示踪;另外,对流层中高层中高纬度冷空气扩散南下与台风的东南暖湿空气在福建沿海交汇,加剧了气旋性涡度发展,对暴雨的发生发展也有巨大的作用。In this paper, MM5V3 model was used to simulate typhoon 0519 ＂LONGWANG＂,and moist potential vorticity （MPV） evolution was derived from output of the model, we studied the mechanism of the storm rainfall deduced by typhoon from the view point of MPV. Results showed that slantwise vorticity development（SVD） is an important mechanism of the rainstorm in Fujian coastland. The heavy rain occurred in the stiff and dense section of θse and isoline of MPV1 dense region in mid-low level of tropo- sphere,minus area of MPV2 could be regarded as the trace of warm-moist airflow or vortex motion, so MPV had strong indicative ability on forecasting of where rainstorm took place. In addition,the confluence of southward low-tropospheric cold air pervading from high latitude and southeastern warm-moist air of typhoon in Fujian coastland made the slope of θse isoline larger and cyclonic vorticity exquisite development, which had great effect on occurrence of storm rainfall.

关 键 词：台风 暴雨 湿位涡 数值模拟 

分 类 号：P435[天文地球—大气科学及气象学]