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《Chinese Journal of Atmospheric Sciences》 2018-05
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Diagnostic Study and Numerical Simulation on the Structure of Typhoon “Muifa” during Its Two Recurving Processes

YUAN Min;PING Fan;LI Guoping;Laboratory of Cloud-Precipitation Physics and Severe Storms,Institute of Atmospheric Physics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;College of Air Traffic Management,Civil Aviation Flight University of China;College of Atmospheric Sciences,Chengdu University of Information Technology;  
A variety of data are used to analyze and study the two recurving processes of typhoon "Muifa", The results show that changes in the northwestern Pacific Subtropical high, the mid-latitude trough and cross-equatorial flows all have impacts on the two recurving processes of "Muifa". The internal TC structure such as the spiral cloud bands and eye wall changed little during the first recurving but they experienced huge changes during the second recurving with the formation of asymmetric structure, the replacement of eye wall and the merging of spiral cloud bands with eye wall. Numerical studies confirmed the above changes during the second recurving process. The mechanism study shows that the zonal and meridional components of environmental flow accounted for more than 83% of the steering flow for the first recurvature. For the second recurvature, the zonal component of storm-scale flow accounted for 23%–36%, while its meridional component accounted for 35%–47% of the steering flow.
【Fund】: 国家自然科学基金项目Y41301E801、U1333130~~
【CateGory Index】: P444
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