Including Coriolis effects in the Prandtl model for katabatic flow
Including Coriolis effects in the Prandtl model for katabatic flow
复制标题
在下降流的普朗特模型中包括科里奥利效应
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
D. Durran
中科院分区：
文献类型：
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作者：
I. Stiperski;I. Kavčič;B. Grisogono;D. Durran
由于科里奥利力的作用，高纬度地区长冰川的下降流会发生偏转。如果将科里奥利力加入到经典的普兰特下降流模型中，横坡风分量不会接近真正的稳定状态，而是及时向上扩散。另一方面，下斜率分量和位温扰动在与经典普朗特模型相同的时间尺度上确实达到平稳性。数值和近似解析解描述这种时空行为。这两种解决方案都符合物理直觉。解析近似解可用于边界层参数化和数据分析。版权所有© 2007皇家气象学会
Katabatic flow down long glaciers in high latitudes experiences deflection due to the Coriolis force. If the Coriolis force is added to the classic Prandtl model for katabatic flow, the cross‐slope wind component does not approach a true steady state, but rather diffuses upwards in time. On the other hand, the down‐slope component and the potential temperature perturbations do reach stationarity on the same time‐scale as in the classic Prandtl model. Numerical and approximate analytic solutions are presented describing this spatio‐temporal behaviour. Both solutions are in accordance with physical intuition. The analytic approximate solution can be useful in boundary‐layer parameterizations and data analysis. Copyright © 2007 Royal Meteorological Society