Two types of summertime heating over the Asian large-scale orography and excitation of potential-vorticity forcing I. Over Tibetan Plateau  

作　　者：WU GuoXiong ZHUO HaiFeng WANG ZiQian LIU YiMin 

机构地区：[1]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics, Chinese Academy of Sciences [2]College of Earth Sciences, University of Chinese Academy of Sciences [3]School of Atmospheric Sciences, Sun Yat-sen University

出　　处：《Science China Earth Sciences》2016年第10期1996-2008,共13页中国科学（地球科学英文版）

基　　金：supported by the Nsyionsl Natural Science Foundation of China (Grant Nos. 41275088, 91437219 & 41328006);the Special Fund for Public Welfare Industry (Meteorology) administered by the Chinese Ministry of Finance and the Ministry of Science and Technology (Grant No. GYHY201406001)

摘　　要：Based on numerical simulation, this study explored the characteristics and interactions of surface sensible heating and atmospheric latent heating over the main part of the Tibetan Plateau, i.e., terrain at elevations >2 km in summer. The impacts of these two types of heating on local vertical motion and monsoonal meridional circulation were compared. Theoretical analysis and numerical experimentation demonstrated that by changing the configuration of the upper-tropospheric air temperature and circulation, the two types of heating could generate both minimum absolute vorticity and abnormal potential vorticity forcing near the tropopause, enhance the meridional circulation of the Asian summer monsoon, and produce an eastward-propagating Rossby wave train within the mid-latitude westerly flow. Consequently, the manifestations of these features were shown to influence the circulation of the Northern Hemisphere.Based on numerical simulation, this study explored the characteristics and interactions of surface sensible heating and atmospheric latent heating over the main part of the Tibetan Plateau, i.e., terrain at elevations 〉2 km in summer. The im- pacts of these two types of heating on local vertical motion and monsoonal meridional circulation were compared. Theoretical analysis and numerical experimentation demonstrated that by changing the configuration of the upper-tropospheric air temper- ature and circulation, the two types of heating could generate both minimum absolute vorticity and abnormal potential vorticity forcing near the tropopause, enhance the meridional circulation of the Asian summer monsoon, and produce an east- ward-propagating Rossby wave train within the mid-latitude westerly flow. Consequently, the manifestations of these features were shown to influence the circulation of the Northern Hemisphere.

关 键 词：Tibetan Plateau Surface sensible heating Latent heating Monsoonal meridional circulation Potential vorticity forcing 

分 类 号：P433[天文地球—大气科学及气象学] P458.121.1