不同再分析资料对热带气旋Roke(2011)外流-高空急流相互作用的对比  

Outflow-jet interaction analysis of tropical cyclone Roke(2011) within different atmospheric reanalysis datasets

作　　者：李艳[1] 金茹 高翔 LI Yan;JIN Ru;GAO Xiang(Key Laboratory of Meteorological Disaster,Ministry of Education(KLME),Nanjing University of Information Science&Technology,Nanjing 210044,China;Weifang Meteorological Bureau of Shandong Province,Weifang 261011,China)

机构地区：[1]南京信息工程大学气象灾害教育部重点实验室,江苏南京210044 [2]山东省潍坊市气象局,山东潍坊261011

出　　处：《大气科学学报》2020年第3期525-536,共12页Transactions of Atmospheric Sciences

基　　金：国家自然科学基金资助项目(41775058;41675051;41575056)。

摘　　要：利用CFSv2、ERA-I、MERRA2和JRA-55四种最新的大气再分析资料、CIMSS高分辨率卫星云图资料以及JTWC、CMA和JMA三种最佳路径与强度资料对热带气旋Roke(2011)外流-高空急流相互作用进行初步分析。研究发现,在Roke(2011)外流-高空急流相互作用的过程中,朝向极地的外流急流以及辐散增强,同时中纬度高空急流向南延伸出的弱正PV与Roke(2011)中心区的正PV逐渐接近并部分叠加,导致了Roke(2011)强度的迅速发展(RI);对比各种再分析资料发现,CFSv2中Roke(2011)外流-高空急流相互作用过程的高层风场和散度场与CIMSS资料中的分布与演变相似,并清楚地再现了高空急流区对弱正PV的输送过程,CFSv2对Roke(2011)的路径与强度变化的描述最接近观测。In this study,the outflow-jet interaction of tropical cyclone Roke (2011) is preliminarily analyzed by using four atmospheric reanalysis datasets (CFSv2,ERA-I,MERRA2 and JRA-55),along with CIMSS high-resolution satellite images and three Best-Track datasets (JTWC,CMA and JMA).It is observed that,during the outflow-jet interaction period,the poleward outflow jet and divergence were enhanced.Meanwhile,the positive PV anomaly extending from the southern side of the upper-level jet stream gradually approached and partially superposed with the positive PV region of Roke (2011),thereby leading to the rapid intensification (RI) of Roke (2011).Among the four atmospheric reanalysis datasets,in CFSv2 the wind and divergence field of Roke (2011) during the process of outflow-jet interaction are similar to the distribution and evolution in CIMSS images.Moreover,CFSv2 accurately described the transmission process of the weak positive PV extending from the southern side of the jet stream to Roke (2011).As a result,the track and intensity changes of Roke (2011) in CFSv2 are most similar to the observations.

关 键 词：热带气旋 外流-高空急流相互作用 再分析资料 迅速增强 

分 类 号：P444[天文地球—大气科学及气象学]