COMPARATIVE ANALYSIS OF THE INTENSIFYING AND WEAKENING LANDFALL TROPICAL CYCLONES DURING EXTRATROPICAL TRANSITION OVER CHINA-中国期刊网

摘要 BasedontheTropicalCyclone(TC)YearbooksdataandJRA-25reanalysisdatafromtheJapanMeteorologicalAgency(JMA)during1979-2008,dynamiccompositeanalysisandcomputationofkineticenergybudgetareusedtostudytheintensifyingandweakeningTCsduringExtratropicalTransitionoverChina.TheTCIshowsstrongupper-leveldivergence,strengthenedlow-levelconvergenceandsignificantlyenhancedupwardmotionundertheinfluenceofstrongupper-leveltroughsandhigh-leveljets.TheTCIiscorrespondinglyintensifiedafterExtratropicalTransition(ET);TCWexhibitsstrongupper-leveldivergence,subduedlow-levelconvergenceandslightlyenhancedupwardmotionundertheinfluenceofweakupper-leveltroughsandhigh-leveljets.ItthenweakensafterET.Theincrease(decrease)ofthegenerationofkineticenergybydivergencewindinTCI(TCW)atlowlevelisoneofthemajorreasonsforTCI’sintensification(TCW’sweakening)aftertransformation.Thegenerationofkineticenergybydivergencewindiscloselyrelatedtothedevelopmentofalow-levelbaroclinicfrontalzone.ThegrowthofthegenerationofkineticenergybyrotationalwindinTCIatupperlevelisfavorableforTCI’smaintenance,whichisaffectedbystrongupper-leveltroughs.ThedissipationofthegenerationofkineticenergybyrotationalwindinTCWatupperlevelisunfavorableforTCW’smaintenance,whichisaffectedbyweakupper-leveltroughs.

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COMPARATIVE ANALYSIS OF THE INTENSIFYING AND WEAKENING LANDFALL TROPICAL CYCLONES DURING EXTRATROPICAL TRANSITION OVER CHINA

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COMPARATIVE ANALYSIS OF THE INTENSIFYING AND WEAKENING LANDFALL TROPICAL CYCLONES DURING EXTRATROPICAL TRANSITION OVER CHINA

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