WIND SPEED DISTRIBUTION FEATURES OF RAPIDLY INTENSIFYING TROPICAL CYCLONES IN NORTHWEST PACIFIC
Abstract：Two categories of tropical cyclone(TC) cases,rapidly intensifying(RI) and non-rapidly intensifying (non-R I) TC cases,are selected according to best-track data from Joint Typhoon Warning Center.Then by using Multiplatform Tropical Cyclone Surface Wind Analysis (MTCSWA) data,different wind speed distribution features and vorticity structure features between RI and non-RI TC cases in the northwest Pacific are analyzed.It is found that there exist significant differences in the TC inner-core structure,Thelarger the compact of TC is,the faster the intensification rate will be.Specifically,the TCs with stronger inner-core vorticity and larger vorticity gradient are more likely to develop rapidly.It is speculated that the larger vorticity gradient of RI cases accelerates convective bursts near the TC to merge through vorticity segregation processes.Meanwhile,greater vorticity implies greater inertial stability,which is helpful for diabatic heating to convert to kinetic energy of TCs.Both of these two factors are conducive to TC development.
Keywords：tropical cyclonewind speed distributionrapid intensification
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 259-266 )