The Wavenumber–Frequency Content of Resonantly Excited Equatorial Waves
The Wavenumber–Frequency Content of Resonantly Excited Equatorial Waves
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共振激发赤道波的波数-频率内容
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
J. Farrar
中科院分区：
文献类型：
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作者：
T. Durland;J. Farrar
本文研究了赤道重力惯性波和Rossby重力混合波的理论共振激发。与偶尔发表的预期相反，解表明，在纬向波数和频率都是宽带的风一般不会在与消失的纬向群速度相关的波数处产生海面高度（SSH）的波数-频谱峰值。当风的纬向结构不对负或正纬向波数施加偏置时，宽带纬向风的重力模式实际上与波数无关。随着波数的增加|K|重力惯性波向纬向传播的纯重力波渐近线，其中纬向速度的大小相对于纬向速度u和压力p的大小逐渐变小。当总波能量与波数无关时，这种效应在|υ| 2接近波数
AbstractThe theoretical resonant excitation of equatorial inertia–gravity waves and mixed Rossby–gravity waves is examined. Contrary to occasionally published expectations, solutions show that winds that are broadband in both zonal wavenumber and frequency do not in general produce peaks in the wavenumber–frequency spectrum of sea surface height (SSH) at wavenumbers associated with vanishing zonal group velocity.Excitation of total wave energy in inertia–gravity modes by broadband zonal winds is virtually wavenumber independent when the meridional structure of the winds does not impose a bias toward negative or positive zonal wavenumbers. With increasing wavenumber magnitude |k|, inertia–gravity waves asymptote toward zonally propagating pure gravity waves, in which the magnitude of meridional velocity υ becomes progressively smaller relative to the magnitude of zonal velocity u and pressure p. When the total wave energy is independent of wavenumber, this effect produces a peak in |υ|2 near the wavenumber...