Eddy Kinetic Energy Study of the Snowstorm over Southern China in January 2008  

作　　者：ZUO Qunjie GAO Shouting L Daren 

机构地区：[1]Laboratory of Cloud-Precipitation Physics and Severe Storms,Institute of Atmospheric Physics, Chinese Academy of Sciences [2]Key Laboratory of Middle Atmosphere and Global Environment Observation,Institute of Atmospheric Physics, Chinese Academy of Sciences [3]State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences

出　　处：《Advances in Atmospheric Sciences》2014年第4期972-984,共13页大气科学进展（英文版）

基　　金：supported by the National Basic Research Project of China (Grant Nos. 2013CB430105 and 2012CB417201);the National Natural Science Foundation of China (Grant No. 40930950);the Chinese Academy of Meteorological Sciences State Key Laboratory of Severe Weather (LaSW) (Grant No. 2011LASW-A01);the Key Research Program of the Sciences (Grant No. KZZDEW-05-01)

摘　　要：The energetics of the third stage of a snowstorm over China was analyzed using ECWMF data.The analysis of the energy budget for the Middle East trough and the western Pacific trough that developed toward China on 25-28 January 2008 showed the advection of the geopotential by the ageostrophic wind to be both a crucial source and the primary sink of the eddy kinetic energy centers associated with the troughs.The magnitudes of the energy conversion terms,interaction kinetic energy conversion and baroclinic conversion,were too small to explain the development of the energy centers and the jet streaks.The energy centers gained energy at their entrance regions via the convergence of the ageostrophic geopotential fluxes,and then lost energy at their exit regions by the same fluxes.At the entrance regions,the fluxes converged,increasing the geopotential gradient,which generated a stronger geostrophic wind and higher kinetic energy,resulting in an ascending motion in this area.When the troughs moved to China,the ascending motion caused by the convergence of the fluxes at entrance region intensified the snowstorms over central and southern China.The energetics of the third stage of a snowstorm over China was analyzed using ECWMF data.The analysis of the energy budget for the Middle East trough and the western Pacific trough that developed toward China on 25-28 January 2008 showed the advection of the geopotential by the ageostrophic wind to be both a crucial source and the primary sink of the eddy kinetic energy centers associated with the troughs.The magnitudes of the energy conversion terms,interaction kinetic energy conversion and baroclinic conversion,were too small to explain the development of the energy centers and the jet streaks.The energy centers gained energy at their entrance regions via the convergence of the ageostrophic geopotential fluxes,and then lost energy at their exit regions by the same fluxes.At the entrance regions,the fluxes converged,increasing the geopotential gradient,which generated a stronger geostrophic wind and higher kinetic energy,resulting in an ascending motion in this area.When the troughs moved to China,the ascending motion caused by the convergence of the fluxes at entrance region intensified the snowstorms over central and southern China.

关 键 词：eddy kinetic energy ageostrophic geopotential flux snowstorms jet streaks 

分 类 号：P433[天文地球—大气科学及气象学] P426.63