Vertical propagation of planetary rossby waves through an atmosphere with Newtonian cooling
Vertical propagation of planetary rossby waves through an atmosphere with Newtonian cooling
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DOI：
10.1029/jb074i004p00929
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发表时间：
1969-02
影响因子：
--
通讯作者：
R. Dickinson
中科院分区：
文献类型：
--
作者：
R. Dickinson
本文导出了Rossby波在具有牛顿冷却的大气中垂直传播的线性化模型。垂直传播的性质取决于牛顿冷却和平均风水平平流的时间尺度，根据这两个时间尺度的相对大小定义各种近似模型。本文给出了具有牛顿冷却的定常Rossby波通过恒定平均风大气的垂直传播的解。这样的波是非常弱的西风平均风高度衰减和衰减最少的西风强度略低于传播截止速度。这种衰减大大减少了可能向上垂直传播的行星波通过地球大气层附近的春分点和整个冬季的数量显着。
A linearized model for the vertical propagation of Rossby waves through an atmosphere with Newtonian cooling is derived. The nature of the vertical propagation depends on the time scale for Newtonian cooling and for horizontal advection by a mean wind, various approximate models being defined according to the relative magnitude of these two time scales. A solution is obtained for the vertical propagation of stationary Rossby waves with Newtonian cooling through a constant mean wind atmosphere. Such waves are highly attenuated for very weak westerly mean winds and are least attenuated for westerly winds of strength somewhat below the propagation cutoff velocity. This attenuation greatly reduces the possible upward vertical propagation of planetary waves through the terrestrial atmosphere near the equinoxes and is quantitatively significant throughout the winter.