Large-scale characteristics of landfalling tropical cyclones with abrupt intensity change

作者：Qianqian JI,Feng XU,Jianjun XU,Mei LIANG,Shifei TU,Siqi CHEN

摘要：Data from the China Meteorological Administration and ERA-Interim are used to examine the environmental characteristics of landfalling tropical cyclones(TCs)with abrupt intensity change.The results show that,of all 657 landfalling TCs during 1979-2017,71%,70%and 65%of all landfalling TDs,TSs and TYs,respectively,intensify.Of all the 16595 samples,4.0%and 0.2%of typhoons and tropical storms,respectively,experience over-water rapid intensification(RI)process during their life cycle.Meanwhile,4.5%and 0.6%of typhoons and tropial storms,respectively,undergo overwater rapid decay(RD).These two kinds of cases,i.e.,RI and RD,are used to analyze their associated large-scale conditions.Comparisons show that the RI cases are generally on the south side of the strong western Pacific subtropical high(WPSH);warm sea surface temperatures(SSTs)and sufficient water vapor fluxes existing in RI samples is a dominant feature that is conducive to the development of TCs.Also,the moderate low-level relative vorticity is favorable for TC intensification.On the contrary,the RD TCs are located on the west side of the WPSH;significant decreasing SSTs and low-level water vapor transport may synergistically contribute to RD.Simultaneously,low-level relative vorticity seems to be unfavorable for the development of TCs.

发文机构：South China Sea Institute of Marine Meteorology College of Ocean and Meteorology Southern Marine Science and Engineering Guangdong Laboratory

关键词：landfallingTROPICALCYCLONEABRUPTINTENSITYCHANGEenvironmentalfactorsdynamiccompositeanalysis

分类号： P73[天文地球—海洋科学]