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首页> 外文期刊>Quarterly Journal of the Royal Meteorological Society >Aircraft measurements and numerical simulations of mountain waves over the central Alps: a pre-MAP test case
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Aircraft measurements and numerical simulations of mountain waves over the central Alps: a pre-MAP test case

机译：中央阿尔卑斯山脉飞机测量和数值模拟：预先映射测试案例

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摘要

In preparation for the field phase of the Mesoscale Alpine Project (MAP), in situ research-aircraft observations from the DLR Falcon, and three-dimensional high-resolution numerical simulations are used to investigate mountain waves generated duringa south fohn event on 10 October 1987. The model simulation qualitatively compares favourably with the aircraft observations in terms of identifying the horizontal and vertical locations of maximum gravity-wave amplitude and rapid decay of wave amplitudes in the lower stratosphere. However, even with reasonably specified large-scale conditions, the vertical Velocity and temperature perturbations are not in quantitative agreement with the aircraft measurements. The results highlight some deficiencies that still exist in our predictive capability to simulate gravity-wave generation and propagation explicitly over three-dimensional topography for non-steady conditions. The complexity of the gravity-wave response points toward the necessity of a straightforward aircraft observing strategy that features linear flight segments oriented along the cross-mountain wind direction, a rapid repetition of these segments in order to assess the significance of transients, and a combination of in situ measurements with remote-sensing data (e.g. from lidar systems and dropsondes), an approach that was successfully applied during the MAP.
机译：为准备Mescle Alpine项目（地图）的现场阶段，原位研究 - 来自DLR Falcon的飞机观察，三维高分辨率数值模拟用于调查1987年10月10日在南福恩活动期间产生的山波。模型模拟在识别较低平流层中的波浪幅度的最大重力波幅度和快速衰减的速度和垂直位置，对飞行器观测有利地进行了比较。然而，即使具有合理指定的大规模条件，垂直速度和温度扰动也没有与飞机测量的定量协议。结果突出了我们的预测能力中仍然存在的一些缺陷，以模拟重力波产生和在三维形貌上明确地进行非稳定条件的传播。重力波响应点的复杂性朝向沿着跨山风向定向的线性飞行段，快速重复这些段，以评估瞬态的重要性，以及评估瞬态的重要性，以及组合使用远程传感数据（例如，来自LIDAR系统和Dropsondes）的原位测量，在地图期间成功应用的方法。

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