Mongolian Mountains Matter Most: Impacts of the Latitude and Height of Asian Orography on Pacific Wintertime Atmospheric Circulation
Mongolian Mountains Matter Most: Impacts of the Latitude and Height of Asian Orography on Pacific Wintertime Atmospheric Circulation
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DOI：
10.1175/jcli-d-16-0401.1
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发表时间：
2017-05
影响因子：
4.9
通讯作者：
R. White;D. Battisti;G. Roe
中科院分区：
文献类型：
--
作者：
R. White;D. Battisti;G. Roe
本文利用半理想化的亚洲地形环流模式试验，探讨了亚洲地形对太平洋冬季大气环流的影响。地形纬度的重要性远大于地形高度。蒙古高原和附近的山脉，以~48°N为中心，对上层冬季急流的影响大约是南部更大更高的青藏高原和喜马拉雅山脉的4倍。蒙古山脉的重要性的关键促成因素是纬向位涡梯度和冲击风的强度的纬度变化，这两者都决定了大气响应的幅度和大气的结构，影响下游响应的空间格局。有趣的是，虽然蒙古山脉在北方半球冬季比青藏高原产生更大的响应，但在4月至6月，蒙古山脉的响应比青藏高原的响应大。
AbstractThe impacts of Asian orography on the wintertime atmospheric circulation over the Pacific are explored using altered-orography, semi-idealized, general circulation model experiments. The latitude of orography is found to be far more important than height. The Mongolian Plateau and nearby mountain ranges, centered at ~48°N, have an impact on the upper-level wintertime jet stream that is approximately 4 times greater than that of the larger and taller Tibetan Plateau and Himalayas to the south. Key contributing factors to the importance of the Mongolian mountains are latitudinal variations in the meridional potential vorticity gradient and the strength of the impinging wind—both of which determine the amplitude of the atmospheric response—and the structure of the atmosphere, which influences the spatial pattern of the downstream response. Interestingly, while the Mongolian mountains produce a larger response than the Tibetan Plateau in Northern Hemisphere winter, in April–June the response from the ...