INFLUENCE OF THE VERTICAL SHEAR OF ENVIRONMENTAL FLOWS ON TYPHOON MOTION

作     者：蒋群 董克勤 

作者机构：Academy of Meteorological ScienceSMABeijing 

出 版 物：《Acta meteorologica Sinica》 (气象学报(英文版))

年 卷 期：1991年第5卷第2期

页      面：228-241页

学科分类：07[理学] 0707[理学-海洋科学] 070601[理学-气象学] 0815[工学-水利工程] 0706[理学-大气科学] 0816[工学-测绘科学与技术] 0824[工学-船舶与海洋工程] 0825[工学-航空宇航科学与技术] 

主　　题：typhoon motion vertical wind shear beta-effect track forecasting 

摘      要：Typhoon is regarded as a convergent,modified Rankine *** on the vorticity equations written at two levels,higher and lower in the troposphere,typhoon motions are discussed in this *** analytical expressions of vortex motion direction and speed have been derived for simple homogeneous basic flows at two *** expressions indicate that in the easterties,vertical wind shear enhances the steering of east flow, causing the vortex moving westward faster,otherwise,in the westerlies,it reduces the steering of the west flow, causing the vortex moving eastward *** results explain theoretically that“cyclones in the easterlies move to the right of,and faster than the basic flow;conversely,cyclones in the westerlies move to the left of,and slower than the basic flow. With derived baroclinic diagnostic equations and a barotropical model,ten cases from 1980 to 1983 have been calculated for 24h typhoon *** results show that the baroclinic models are better than the baro- tropic ***,the vertical wind shear is one of the important factors affecting typhoon movement.