The Forcing of Antarctic Katabatic Winds
The Forcing of Antarctic Katabatic Winds
复制标题
南极下降风的强迫
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
K. Waight
中科院分区：
文献类型：
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作者：
T. Parish;K. Waight
摘要利用具有明确长波辐射参数化的流体静力学二维原始方程模型，研究了具有代表性的南极地形的理想斜坡上斜降风的时空发展。对一个由于下垫面强辐射冷却而从静止发展而来的降速流的模拟作了详细的诊断。在平缓倾斜的内部和靠近海岸陡峭的冰坡上，重力驱动的流动在热力学和动力学上存在显著差异。最强的温度逆温和最大的静态稳定性出现在大陆内部，尽管沿海地区的净降温和向下坡方向的水平压力梯度力的强度最大。内部的特点是低罗斯比数，准地转型流，而更强烈的，近反旋风发生在海岸。模型结果在合理范围内。
Abstract The temporal and spatial development of katabatic winds along an idealized slope representative of Anmtarctic terrain is examined using a hydrostatic, two-dimensional primitive equation model with explicit longwave radiation parameterization. A detailed diagnosis is made of a simulation in which katabatic flow develops from rest due to the strong radiational cooling of the underlying surface. Significant thermodynamic and dynamic differences are seen between the gravity-driven flows over the gently-sloping interior and over the steep ice slopes near the coast. The strongest temperature inversions and largest static stabilities are found over the interior of the continent, although the net cooling of the katabatic layer and magnitude of the downslope-directed horizontal pressure gradient force are greatest at the coast. The interior is characterized by low Rossby number, quasi-geostrophic type flows, while more intense, near-antitriptic winds occur at the coast. Model results are in reasonable agr...