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分析
投稿时间: 2018-03-02  最后修改时间: 2018-03-29  点此下载全文
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作者单位E-mail
李艳 南京信息工程大学 气象灾害教育部重点实验室 yanlee@nuist.edu.cn 
金茹 南京信息工程大学 气象灾害教育部重点实验室  
高翔 山东省昌邑市气象局  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要: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,并清楚的再现了高空急流区对弱正PV的输送过程,因此CFSv2对Roke (2011)的路径与强度变化的描述最接近观测。
中文关键词:热带气旋  外流-高空急流相互作用  再分析资料  迅速增强
 
Outflow-jet interaction analysis of tropical cyclone Roke (2011) within different atmospheric reanalysis datasets
Abstract:Outflow-jet interaction of tropical cyclone Roke (2011) is preliminarily analyzed by using four atmospheric reanalysis datasets (CFSv2, ERA-I, MERRA2 and JRA-55), CIMSS high-resolution satellite images and three Best-Track datasets (JTWC, CMA and JMA). It is found 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 upper-level jet stream gradually approached and partially superposed with the positive PV region of Roke (2011), which leads to the rapid intensification (RI) of Roke (2011). Among four atmospheric reanalysis datasets, in CFSv2 the wind and divergence field of Roke (2011) in the process of outflow-jet interaction are similar to the distribution and evolution in CIMSS images. Moreover, CFSv2 distinctly described the transmission process of the weak positive PV extending from the southern side of jet stream to Roke (2011). As a result, the track and intensity changes of Roke (2011) in CFSv2 are closest to the observations.
keywords:tropical cyclone  outflow-jet interaction  reanalysis datasets  RI
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