Simulation of the Effects of SST Changes Induced by Tropical Cyclones on the Intensity of Tropical Cyclone Bilis(0604)  

作　　者：YUAN Jin-nan ZHANG Cheng-zhong WEN Guan-huan ZHOU Ming-sen ZHU Yu 袁金南;张诚忠;温冠环;周明森;朱宇(Guangzhou Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction,CMA,Guangzhou 510641 China)

机构地区：[1]Guangzhou Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction,CMA,Guangzhou 510641 China

出　　处：《Journal of Tropical Meteorology》2024年第4期351-360,共10页热带气象学报(英文版)

基　　金：National Natural Science Foundation of China(42275123);Guangdong Basic and Applied Basic Research Foundation(2024A1515010508);Guangdong Provincial Marine Meteorology Science Data Center(2024B1212070014);Innova-tion Team of Severe Weather Mechanism and Forecasting Technology in the South China Sea of Guangdong Meteorolo-gical Service(GRMCTD202201);Science and Technology Research Project of Guangdong Meteorological Service(GRMC2022M02)。

摘　　要：The effects of sea surface temperature(SST)changes induced by tropical cyclone(TC)Bilis(0604)and its preceding TC,TC Ewiniar(0603),on the intensity of TC Bilis were investigated by using numerical experiments.The observed SST changes induced by TCs Ewiniar(0603)and Bilis(0604)were first separated by using the smooth filtering and cylindrical filtering methods.The maximum SST cooling induced by TC Ewiniar(0603)exceeded 3℃,and that induced by the two TCs,Ewiniar(0603)and Bilis(0604),exceeded 6℃.The simulation results show that the SST cooling induced by TC Ewiniar(0603)and by two TCs reduced the intensity of TC Bilis(0604)by 6.2 m s^(-1)and 7.6 m s^(-1)within 60 h,respectively.Without the SST cooling induced by TC Ewiniar(0603),TC Bilis(0604)could have developed into a typhoon.The cold wake induced by TC Ewiniar(0603)was an important factor in inhibiting the intensity of TC Bilis(0604).Based on the analysis of the physical processes of the simulation results,a schematic diagram of the effects of SST changes induced by TCs on the intensity of TC Bilis(0604)was presented.The SST cooling reduced the upward heat flux and moisture flux at the surface of TC mainly within a radius of two latitudes,which in turn decreased the conditional instability and atmospheric moisture in the lower layer of TC,followed by weakening in TC precipitation,TC warm core,the upward vertical velocity of TC,and the inward radial wind in the lower layer of TC.The intensity of TC Bilis(0604)decreased accordingly.

关 键 词：sea surface temperature cooling tropical cyclone intensity spatial filtering numerical simulation 

分 类 号：P444[天文地球—大气科学及气象学]