Impacts of Steering Flows with Different Timescales on the Track of Typhoon Sanba(2012)  

作　　者：Qiao LIU Melinda PENG Weican ZHOU Tim LI 

机构地区：[1]Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)/Key Laboratory of Meteorological Disaster,Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environmental Change(ILCEC),Nanjing University of Information Science&Technology,Nanjing 210044,China [2]University of Colorado,Colorado Spring,Colorado 80918,USA [3]International Pacific Research Center and Department of Atmospheric Sciences,School of Ocean and Earth Science and Technology,University of Hawaii at Manoa,Honolulu,Hawaii 96822,USA

出　　处：《Journal of Meteorological Research》2021年第2期343-357,共15页气象学报（英文版）

基　　金：the National Natural Science Foundation of China(41630423 and 41875069);US National Oceanic and Atmospheric Administration(NA18OAR4310298);US National Science Foundation(AGS-1643297);Priority Academic Program Development of Jiangsu Higher Education Institutions and China Scholarship Council(N201908320496)。

摘　　要：Typhoon Sanba(2012),the strongest tropical cyclone(TC)of the year worldwide,moved northward almost along130°longitude during its lifetime and passed through different background flows from low to high latitudes.The steering flows with different timescales for Sanba are retrieved by using the NCEP reanalysis data with the total wind field separated into:a mean state,an interannual component,an intraseasonal component,and a synoptic component.Our analysis indicates that the intraseasonal timescale wave train(WT)with east–west oriented circulations made the largest contribution to the movement of Sanba.The effects of the environmental steering with different timescales on Sanba’s movement are investigated with numerical simulations using the Weather Research and Forecasting(WRF)model.In the control simulation,total fields from the NCEP reanalysis are used as initial and boundary conditions,and the northward motion of Sanba is well captured.In sensitivity experiments,each of the intraseasonal and interannual components is removed one at a time.The steering vectors associated with these timescales can explain their influences on the movement of Sanba in the experiments.Vorticity budget analyses indicate that the horizontal vorticity advection made the largest contribution to the movement of the storm.

关 键 词：INTRASEASONAL INTERANNUAL mean state steering flow 

分 类 号：P444[天文地球—大气科学及气象学]