The sensitivity and stability of the ocean ’ s thermohaline circulation to finite amplitude perturbations
The sensitivity and stability of the ocean ’ s thermohaline circulation to finite amplitude perturbations
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发表时间：
2007
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通讯作者：
M. Mu
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作者：
M. Mu
在一个简单的模式背景下，温盐环流有限振幅扰动的敏感性和稳定性进行了研究。一种新的方法被用来解决这个非线性问题。该方法是基于所谓的条件非线性最优扰动（HOCP），这是一个非线性推广的线性奇异向量法（LSV）的计算。结果表明，线性稳定的温盐环流状态可以变为非线性不稳定的，并确定了具有最佳非线性增长的扰动的性质。一个不对称的非线性响应扰动存在相对于有限振幅淡水扰动的迹象，热为主和盐度为主的温盐流。这种不对称性是由于通过平流过程的扰动的非线性相互作用。
Within a simple model context, the sensitivity and stability of the thermohaline circulation to finite amplitude perturbations is studied. A new approach is used to tackle this nonlinear problem. The method is based on the computation of the so-called Conditional Nonlinear Optimal Perturbation (CNOP) which is a nonlinear generalization of the linear singular vector approach (LSV). It is shown that linearly stable thermohaline circulation states can become nonlinearly unstable and the properties of the perturbations with optimal nonlinear growth are determined. An asymmetric nonlinear response to perturbations exists with respect to the sign of finite amplitude freshwater perturbations, on both thermally dominated and salinity dominated thermohaline flows. This asymmetry is due to the nonlinear interaction of the perturbations through advective processes.