大气和海洋科学快报（英文版）2021，Vol.14Issue(2)：53-59,7.
青藏高原东部暴雨的中尺度有效位能收支分析
Budget analysis of mesoscale available potential energy in a heavy rainfall event over the eastern Tibetan Plateau
摘要
Abstract
Using model simulated data,the distribution characteristics,genesis,and impacts on precipitation of available potential energy(APE)are analyzed for a heavy rainfall event that took place over the eastern Tibetan Plateau during 10-11 July 2018.Results show that APE was mainly distributed below 4 km and within 8-14 km.The APE distribution in the upper level had a better correspondence with precipitation.Northwestern cold advection and evaporation of falling raindrops were primary factors leading to positive anomalies of APE in the lower level,while positive anomalies of APE in the upper level were caused by a combination of thermal disturbances driven by latent heat and potential temperature perturbations resulting from the orography of the Tibetan Plateau.Budget analysis of APE indicated that APE fluxes and conversion between APE and kinetic energy(KE)were the main source and sink terms.Meridional fluxes of APE and conversion of KE to APE fed the dissipation of APE in the lower level.Vertical motion enhanced by conversion of APE to KE in the upper level was the major factor that promoted precipitation evolution.A positive feedback between APE and vertical motion in the upper level generated a powerful correlation between them.Conversion of KE to APE lasted longer in the lower level,which weakened vertical motion;whereas,northwestern cold advection brought an enhanced trend to the APE,resulting in a weak correlation between APE and vertical motion.关键词
暴雨/有效位能/有效位能收支/垂直运动Key words
Heavy rainfall/Available potential energy/Budget analysis/Vertical motion/引用本文复制引用
Kuo Zhou,Lingkun Ran,Yi Liu,Xiuxia Tian..青藏高原东部暴雨的中尺度有效位能收支分析[J].大气和海洋科学快报（英文版）,2021,14(2):53-59,7.基金项目
This study was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences[grant number XDA17010105],the National Key Research and Development Program[grant number 2018YFC1507104],the Key Scientific and Technology Research and De-velopment Program of Jilin Province[grant number 20180201035SF],and the National Natural Sciences Foundation of China[grant numbers 41775140,41575065,and 41790471]. （）
