Impact of Dynamic and Thermal Forcing on the Intensity Evolution of the Vortices over the Tibetan Plateau in Boreal Summer

作     者：高媛 姚秀萍 GAO Yuan;YAO Xiu-ping

作者机构：Chinese Academy of Meteorological SciencesBeijing 100081 China China Meteorological Administration Training CentreBeijing 100081 China 

出 版 物：《Journal of Tropical Meteorology》 (热带气象学报（英文版）)

年 卷 期：2020年第26卷第2期

页      面：239-252页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：National Key R and D Program of China(2018YFC1507804) National Natural Science Foundation of China(91637105,41775048 and 91937301) Second Tibetan Plateau Scientific Expedition and Research(STEP)program(2019QZKK0105) 

主　　题：Tibetan Plateau Vortex intensity dynamic composite method diabatic heating 

摘      要：The Tibetan Plateau Vortex(TPV)is one of the main weather systems causing heavy rainfall over the Tibetan Plateau in boreal *** on the second Modern-Era Retrospective Analysis for Research and Applications(MERRA-2)reanalysis datasets provided by the National Aeronautics and Space Administration(NASA),8 cases of TPV over the Tibetan Plateau generated in June-August with a lifetime of 42 hours are composited and analyzed to reveal the impact of dynamic and thermal forcing on the intensity evolution of *** results are as follows.(1)The TPVs appear obviously at 500 h Pa and the TPVs intensity(TPVI)shows an obvious diurnal variation with the strongest at 00 LT and the weakest at 12 LT(LT=UTC+6 h).(2)A strong South Asia High at 200 h Pa as well as a shrunken Western Pacific Subtropical High at 500 h Pa provide favorable conditions for the TPVI increasing.(3)The vorticity budget reveals that the divergence is indicative of the variation of the *** TPVI decreases when the convergence center at500 h Pa and the divergence center at 200 h Pa lie in the east of the TPVs center and increases when both centers coincide with the TPVs center.(4)Potential vorticity(PV)increases with the enhancement of the *** PV budget shows that the variation of the TPVI is closely related to the diabatic heating over the Tibetan *** increased sensible heating and radiative heating in the boundary layer intensify the ascent and latent heating *** the diabatic heating center rises to 400 h Pa,it facilitates the development of the TPVs.