Two types of summertime heating over the Asian large-scale orography and excitation of potential-vorticity forcing I. Over Tibetan Plateau
Two types of summertime heating over the Asian large-scale orography and excitation of potential-vorticity forcing I. Over Tibetan Plateau
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DOI：
10.1007/s11430-016-5328-2
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发表时间：
2016-08
期刊：
影响因子：
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通讯作者：
Guoxiong Wu;H. Zhuo;Ziqian Wang;Yimin Liu
中科院分区：
文献类型：
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作者：
Guoxiong Wu;H. Zhuo;Ziqian Wang;Yimin Liu
本研究基于数值模拟，探讨了夏季青藏高原主体部分（即海拔>2 km地形）地表感热与大气潜热的特征及其相互作用。比较了这两种加热方式对局部垂直运动和季风经向环流的影响。理论分析和数值实验表明，两种加热方式通过改变对流层上层气温和环流的配置，可以在对流层顶附近产生最小绝对涡度和异常位涡强迫，增强亚洲夏季风的经向环流，并在中纬度西风气流中产生东传的罗斯贝波列。因此，这些特征的表现被证明会影响北半球的环流。
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.