A Numerical Study on Rapid Intensification of Typhoon Vicente (2012) in the South China Sea. Part II: Roles of Inner-Core Processes

被引:60
作者
Chen, Xiaomin [1 ,2 ,3 ,4 ]
Wang, Yuqing [3 ,4 ]
Fang, Juan [1 ,2 ]
Xue, Ming [1 ,2 ,5 ,6 ]
机构
[1] Nanjing Univ, Minist Educ, Key Lab Mesoscale Severe Weather, Nanjing, Jiangsu, Peoples R China
[2] Nanjing Univ, Sch Atmospher Sci, Nanjing, Jiangsu, Peoples R China
[3] Univ Hawaii Manoa, Sch Ocean & Earth Sci & Technol, Int Pacific Res Ctr, Honolulu, HI 96822 USA
[4] Univ Hawaii Manoa, Sch Ocean & Earth Sci & Technol, Dept Atmospher Sci, Honolulu, HI 96822 USA
[5] Univ Oklahoma, Ctr Anal & Predict Storms, Norman, OK 73019 USA
[6] Univ Oklahoma, Sch Meteorol, Norman, OK 73019 USA
关键词
TROPICAL CYCLONE INTENSITY; VERTICAL WIND SHEAR; LARGE-SCALE CHARACTERISTICS; HURRICANE EDOUARD 2014; ENVIRONMENTAL DYNAMICAL CONTROL; WESTERN NORTH PACIFIC; KINEMATIC STRUCTURE; EVOLUTION; ATLANTIC; FLOW;
D O I
10.1175/JAS-D-17-0129.1
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
In Part I of this study, the role of environmental monsoon flow in the onset of rapid intensification (RI) of Typhoon Vicente (2012) was discussed. In this Part II, key inner-core processes that effectively resist environmental vertical wind shear during RI onset are investigated. The convective precipitation shield (CPS) embedded in the downshear convergence zone plays a vital role in preconditioning the tropical cyclone (TC) vortex before RI. The CPS induces a mesoscale positive vorticity band (PVB) characterized by vortical hot tower structures upstream and shallower structures (similar to 4 km) downstream. Multiple mesovortices form successively along the PVB and are detached from the PVB at its downstream end, rotating cyclonically around the TC center. The sufficient amount of vorticity anomalies in the PVB facilitates the upscale growth of a mesovortex into a reformed inner vortex, which eventually replaces the parent TC vortex (i.e., downshear reformation), leading to RI onset. The timing of downshear reformation is closely related to the gradually enhancing convective activity in the CPS, which is likely triggered/enhanced by increased surface heat fluxes in the downshear-left quadrant. Results from vorticity budget analyses suggest that convection in the CPS contributes to the vertical development of the tilted reformed inner vortex largely through tilting horizontal vorticity and advecting vorticity upward. The enhanced midlevel inner vortex precesses more quickly into the upshear flank and is concurrently advected toward the low-level inner vortex, resulting in vertical alignment of the reformed inner vortex and parent TC vortex at the end of downshear reformation.
引用
收藏
页码:235 / 255
页数:21
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