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首页> 外文期刊>Journal of the Atmospheric Sciences >Flow in the lee of idealized mountains and Greenland
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Flow in the lee of idealized mountains and Greenland

机译：在理想化的山脉和格陵兰的背风中流动

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A series of idealized simulations of flow impinging on large mountains is conducted to investigate the impact of the mountain on the flow far downstream and to shed some light on the effects that Greenland may have on airflow over the North Atlantic. The upstream profiles of wind and stability are kept constant, there is no surface friction, the Rossby number is 0.4, and the nondimensional mountain height (<(h)overcap> = Nh/U) is varied from 1 to 6. The maximum sea level pressure deficit, the maximum geopotential height deficit, and the orographically generated potential vorticity all increase with increased (h) over cap, showing no signs of abrupt change as the flow enters the regime of upstream blocking. The potential vorticity produced at the mountain is accumulated in vortices that are advected downstream. The vortices are associated with a larger pressure gradient to the south of the wake, giving rise to stronger westerlies at the surface as well as at upper levels. This process can explain how Greenland may affect cyclones moving far outside the mountain wake. An example from Fronts and Atlantic Storm Track Experiment (FASTEX) shows that a cyclone moving from the southwest toward Scotland becomes shallower and slower if the Greenland topography is removed. [References: 40]
机译：进行了一系列理想的流撞击大山的模拟，以研究山对远流下游的影响，并为格陵兰岛对北大西洋气流的影响提供一些启示。上游风速和稳定性保持不变，没有表面摩擦，Rossby数为0.4，无量纲山高（<（h）overcap> = Nh / U）在1到6之间变化。最大的海面液位压力赤字，最大地势高度赤字和地形产生的潜在涡度都随上限（h）的增加而增加，随着流量进入上游阻塞状态，没有出现突然变化的迹象。在山上产生的潜在涡流会累积在向下游平流的涡流中。涡流与尾流以南的较大压力梯度相关，从而在水面和高层产生了更强的西风。这个过程可以解释格陵兰岛如何影响旋风远移到山尾之后。 Fronts and Atlantic Storm Track Experiment（FASTEX）的一个例子表明，如果去除格陵兰的地形，从西南向苏格兰移动的气旋将变得更浅，更慢。 [参考：40]

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