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首页> 外文期刊>Journal of Physical Oceanography >Basin-Mode Interactions and Selection by the Mean Flow in a Reduced-Gravity Quasigeostrophic Model
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Basin-Mode Interactions and Selection by the Mean Flow in a Reduced-Gravity Quasigeostrophic Model

机译：重力重力拟地转模型中的盆模式相互作用及平均流选择

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摘要

The selection mechanisms of Rossby basin modes are investigated in the reduced-gravity quasigeostrophic framework. The linear solution of the wind-driven circulation is decomposed in a steady forced-dissipated solution and a time-dependent component. The steady solution consists in a classical Sverdrup flow dissipated in a thin western boundary layer. The time-dependent solution is a sum of Rossby basin modes with arbitrary amplitudes. The effect of the nonlinear term is handled through a weakly nonlinear analysis providing a set of evolution equations for the mode amplitudes. It is shown both analytically (infinite Burger number) and numerically (finite Burger number) that mode stability is related to the gyre configuration. For cyclonic or anti-cyclonic single gyres, all basin modes are neutral. In the traditional (reversed) double-gyre case, large-scale basin modes are damped (unstable). Pure basin-mode interactions yield triads with cycling energy and subhar-monic instabilities. The latter provide a potential mechanism for spectral reddening.
机译：在减小重力拟地转框架下研究了Rossby盆地模式的选择机理。风动力循环的线性解分解为稳定的强迫耗散解和随时间变化的分量。稳定的解决方案在于经典的Sverdrup流在薄的西部边界层中消散。随时间变化的解决方案是任意振幅的Rossby盆地模式之和。非线性项的影响通过弱非线性分析来处理，该分析提供了一组模式振幅的演化方程。解析地（无限的伯格数）和数值（有限的伯格数）都表明，模式稳定性与回旋结构有关。对于气旋或反气旋单回转，所有流域模式均为中性。在传统的（反向）双回转情况下，大型流域模式被衰减（不稳定）。纯的盆地模式相互作用产生具有循环能量和次谐波不稳定性的三元组。后者提供了潜在的光谱增红机制。

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