“碧丽斯”台风暴雨影响广西的湿位涡诊断分析  

Diagnostic Analysis of Moist Potential Vorticity for “BILLIS” Typhoon Rainstorm in Guangxi

作　　者：李生艳[1] 丁治英[2] 

机构地区：[1]南京信息工程大学大气科学系,江苏南京210044 [2]广西区气象台,广西南宁530022

出　　处：《气象研究与应用》2007年第1期25-28,共4页Journal of Meteorological Research and Application

摘　　要：应用湿位涡理论,对发生在广西境内由台风减弱的低压引发的大暴雨过程进行诊断。结果表明:暴雨产生在eθ面陡峭密集区附近,eθ陡立密集区附近易导致湿斜压涡度发展;当对流层低层M PV 1<0,同时M PV 2>0时,暴雨易发生,暴雨产生在高低空正负湿位涡柱的下方;对流层高层高值湿位涡下传,使得对流层低层稳定度降低,导致对流不稳定能量释放,有利于暴雨产生。低层西南暖湿气流加强,不稳定能量在释放的同时不断得到补充,使得暴雨增幅。Using the theory of the moist potential vorticity to diagnostic analyze the rainstorm caused by weaken typhoon circulation in Guangxi. Results show that the heavy rain events occurred in the very stiff and dense section of e concentrated reagion, which can lead to the development of moist slantwise vorticity; When MPV1〈0 and MPV2〉0 in the low troposphere the rainstorm will probably happen. Rainstorm is below the site where the MPV is positive at upper and negative at low; the downward spread of high from the upper troposphere is an advantage to the release and deposit of instability energy and the SW stream strengthening give rise to the amplification of rainstorm

关 键 词：湿位涡 台风暴雨 诊断分析 

分 类 号：P457.8[天文地球—大气科学及气象学]