Bifurcations and instabilities in rotating, two-layer fluids: II. β-plane

Bifurcations and instabilities in rotating, two-layer fluids: II. β-plane
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旋转两层流体的分叉和不稳定性:β 平面。

DOI:
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发表时间:
2001
期刊:
影响因子:
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通讯作者:
P. L. Read
P. L. Read
中科院分区:
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文献类型:
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作者:
A. F. Lovegrove;I. M. Moroz;P. L. Read

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本文证明了具有变粘性的f平面上的斜压不稳定的两层模式中的弱非线性波的行为是由一个单一的退化余维3分岔决定的。在这个过程中,我们展示了以前的研究,使用多尺度的方法来推导缓慢变化的增长波的振幅的演化方程,作为一般演化描述的特殊限制。一项伴随研究将把结果扩展到β平面。
In this paper, we show that the behaviour of weakly nonlinear waves in a 2-layer model of baroclinic instability on an f-plane with varying viscosity is determined by a sin- gle, degenerate codimension three bifurcation. In the pro- cess, we show how previous studies, using the method of multiple scales to derive evolution equations for the slowly varying amplitude of the growing wave, arise as special lim- its of the general evolution description. A companion study will extend the results to a β-plane.