高空槽对两类热带气旋变性阶段强度变化影响的数值模拟研究  

Numerical study on the upper-level trough's effect on the intensity changes of two types of tropical cyclones landing in China during extratropical transition

作　　者：王晶晶[1,2] 王咏青 廖玥[3] WANG Jingjing;WANG Yongqing;LIAO Yue(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disasters,Ministry of Education/School of Atmospheric Sciences,Nanjing University of Information Science&Technology,Nanjing 210044,China;Nanjing Joint Center of Atmospheric Research,Nanjing 210019,China;Fujian Meteorological Communication Outreach Education Center,Fuzhou 350001,China)

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心/气象灾害教育部重点实验室/大气科学学院,南京210044 [2]南京大气科学联合研究中心,南京210019 [3]福建省气象宣传科普教育中心,福州350001

出　　处：《气象科学》2021年第4期452-462,共11页Journal of the Meteorological Sciences

基　　金：国家自然科学基金资助项目(41875070);广东省重点领域研发计划资助项目(2020B1111200001);云南省重点研发计划资助项目(2018BC007);北极阁开放基金—南京大气科学联合研究中心资助项目(NJCAR2018MS02)。

摘　　要：选取9711号台风“Winnie”和0713号台风“Wipha”分别作为变性加强和变性减弱类台风个例进行数值模拟,而后利用模式结果对大尺度场及涡度收支场进行诊断分析。结果表明:台风“Winnie”变性过程中,其西北侧高空槽呈西北-东南走向,南亚高压强度弱,对高空槽东移阻塞作用小。变性前期阶段主要是锋面系统和斜压性起关键作用,变性完成后,“Winnie”在斜压、高层辐散及涡度平流的共同作用下再次加强。台风“Wipha”变性过程受强大的南亚高压和副高影响,其西北侧高空槽稳定少动且呈东北-西南走向,冷空气入侵不明显,斜压区面积和强度都受到了限制。另外高层辐散场和涡度平流场均未能为“Wipha”提供有利的环境使其再加强。Typhoon Winnie and Wipha were selected as examples of enhanced and weakened typhoon for numerical simulation,then the large⁃scale field and vorticity budget field were diagnosed and analyzed by using the model results.Results show that in Winnie process,the high trough on the northwest side of typhoon tends to present northwest⁃southeast trend,and the intensity of South Asia high is weak,which has little blocking effect on the eastward movement of high trough.The main reason for Winnie􀆳s early stage of denaturation is that frontal system and baroclinic property play a key role.After the degeneration completes,Winnie strengthens under the joint action of baroclinic property,high⁃rise divergence and vorticity advection.The Wipha process is affected by the strong South Asia high and the subtropical high.The northwest high trough is stable and has a northeast⁃southwest trend.The cold air intrusion is not obvious,and the area and strength of the baroclinic zone are limited.In addition,neither the divergence field nor the vorticity flat flow field can provide favorable environment for the enhancement of the Wipha.

关 键 词：变性 高空槽 数值模拟 斜压性 

分 类 号：P444[天文地球—大气科学及气象学]