Inertia-Gravity Wave and Neutral Eady Wave Trains Forced by Directionally Sheared Flow over Isolated Hills.
Inertia-Gravity Wave and Neutral Eady Wave Trains Forced by Directionally Sheared Flow over Isolated Hills.
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孤山上定向剪切流驱动的惯性重力波和中性初波列。
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发表时间：
2003
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通讯作者：
G. Shutts
中科院分区：
文献类型：
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作者：
G. Shutts
本文给出了描述一类特殊的孤立山丘或山脊定向剪切流的线性化方程组的解析解。流动的特点是恒定的浮力频率和垂直风切变，尽管由于垂直于风切变矢量的恒定水平风分量的存在，风向随高度而变化。包含一个常数科里奥利参数允许惯性波列和中性斜压波列的形成。本研究的一个特别的重点是选择性的临界水平吸收过程的性质，结果从不同的风向与高度的强迫波模式的方位角谱的存在下。它将表明，由圆形和椭圆形的山丘中尺度尺寸所产生的静止扰动包括惯性波列，在所有高度的水平风扰动的形式，和斜压波列的方向延伸的顺风。
Abstract Analytical solutions are obtained to the linearized equations describing a particular class of directionally sheared flow over isolated hills or ridges. The flows are characterized by constant buoyancy frequency and vertical wind shear, though the wind direction changes with height due to the presence of a constant, horizontal wind component normal to the wind shear vector. The inclusion of a constant Coriolis parameter permits the formation of inertia wave trains and neutral baroclinic wave trains. A particular focus of this study is the nature of the selective critical level absorption process that results from varying wind direction with height in the presence of an azimuthal spectrum of forced wave modes. It will be shown that the stationary disturbance generated by circular and elliptical hills of mesoscale dimensions comprises an inertia wave train that trails downwind at all heights in the form of a horizontal wind perturbation, and a baroclinic wave train that extends in the direction of ...