气象科学2017，Vol.37Issue(6)：735-741,7.DOI:10.3969/2016jms.0070
局地海表温度异常影响热带气旋路径的模拟研究
A numerical study on the influence of abnormal local sea surface temperature on the track of tropical cyclone
摘要
Abstract
Taking Tropical Cyclone (TC) Megi(2010) for example,a set of sensitivity tests by using the Weather Research and Forecasting(WRF) model as well as different Sea Surface Temperature(SST) on Megi's track were carried out.SST from FNL reanalysis data of NCEP were used in CTRL experiment.EXP1 and EXP2 are performed with increasing and decreasing SST on the track before TC hiting Philip pines.Results show that TC track simulated by CTRL is close to the observation,while tracks in EXP1 and EXP2 turn northward earlier and later than those in CTRL.TC track in EXP1 shifts eastward,while in EXP2 it shifts westward.The reason why abnormal SST would result in different tracks is further analyzed,which found that when TC passed over warm SST to the east of Luzon Island,its strength enhanced,which generate an abnormal positive vorticity advection.Condensations of water vapor into rain with latent heat releasing are increased above 500 hPa.Thus,there is an abnormal positive temperature over the Sensitivity Region(SR) of the Western Pacific Subtropical High (WPSH).Meanwhile,the mixing of hydrometeors and precipitation evaporation processes intensified below 500 hPa.Thus,temperature over the SR of the WPSH is abnormally negative.Positive vorticity advection,the abnormal warming above and cooling below 500 hPa causes a decreasing in geopotential height at 500 hPa and a weakening of the WPSH.Thus,the range of the WPSH extension westward decreased.As a result,TC turns northward earlier and the track shifts eastward.On the contrary,when TC passed over cold SST to the east of Luzon Island,the range of the WPSH extension westward increased.Finally,TC turns northward later and shifts westward.关键词
海表温度/热带气旋/副热带高压/WRF模式Key words
Sea surface temperature/Tropical cyclones/Subtropical high/WRF model分类
天文与地球科学引用本文复制引用
宋攀,钟中,齐琳琳,孙源,王晓丹..局地海表温度异常影响热带气旋路径的模拟研究[J].气象科学,2017,37(6):735-741,7.基金项目
中国科学院战略性先导科技专项(XDA10010405) （XDA10010405）
国家自然科学基金资助项目(41430426 （）
41205044 （）
41205075) （）
江苏省自然科学基金资助项目(BK2012062) （BK2012062）
