A numerical investigation of polar lows
A numerical investigation of polar lows
复制标题
极地低气压的数值研究
DOI：
10.1002/qj.49710343604
复制
发表时间：
1977
影响因子：
8.9
通讯作者：
C. Duncan
中科院分区：
文献类型：
--
作者：
C. Duncan
本文利用准地转数值模式，求出了近地低稳定度不稳定扰动的简正模解。分析了极地低压发展的三种情况，为模式提供必要的数据。因此，所获得的正常模式的解决方案是那些具有最高的增长率的条件下，其中极性空气凹陷已经开发。由于该模型是二维的，是通过平均流的横截面，扰动振幅和能量转换率的增长在这个平面上的扰动描述为每种情况下。结果表明，静力稳定度的水平变化是预报问题中的一个重要因素，并提出了极低发展的一些判据。
A quasi-geostrophic numerical model is employed to find normal mode solutions for unstable disturbances with low static stability near the earth's surface. Three occasions on which polar lows developed are analysed to provide the necessary data for the model. The normal mode solutions which are obtained are, therefore, those which have the highest growth rates under conditions in which polar-air depressions have developed. Since the model is two-dimensional, being a cross-section through the mean flow, the perturbation amplitude and energy conversion rates of the growing disturbances in this plane are described for each case. It is shown that horizontal variations in static stability are an important factor in the forecasting problem and some criteria for polar-low development are suggested.