Interaction of Additive Noise and Nonlinear Dynamics in the Double-Gyre Wind-Driven Ocean Circulation
Interaction of Additive Noise and Nonlinear Dynamics in the Double-Gyre Wind-Driven Ocean Circulation
复制标题
双旋风驱动海洋环流中加性噪声与非线性动力学的相互作用
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
H. Dijkstra
中科院分区：
文献类型：
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作者：
T. Sapsis;H. Dijkstra
摘要本文研究了双环流风驱动海洋环流准等转模式中加性噪声与非线性动力学的相互作用。最近发展的动态正交场论框架用于确定随着力与摩擦比的增加而通过系统的连续分岔产生的流的统计量。本文研究的重点是了解噪声的时空相干性在风应力强迫中的作用。当风应力噪声暂时为白色时，随机双环流的统计量不依赖于噪声的空间结构和幅值。这意味着，风应力场中空间非均匀的噪声强迫只有当噪声在时间上有颜色时才会对流动的动力学产生影响。后一种随机强迫根据其空间相关特性可能引起更复杂或更相干的动力学。
AbstractIn this paper the authors study the interactions of additive noise and nonlinear dynamics in a quasigeostrophic model of the double-gyre wind-driven ocean circulation. The recently developed framework of dynamically orthogonal field theory is used to determine the statistics of the flows that arise through successive bifurcations of the system as the ratio of forcing to friction is increased. This study focuses on the understanding of the role of the spatial and temporal coherence of the noise in the wind stress forcing. When the wind stress noise is temporally white, the statistics of the stochastic double-gyre flow does not depend on the spatial structure and amplitude of the noise. This implies that a spatially inhomogeneous noise forcing in the wind stress field only has an effect on the dynamics of the flow when the noise is temporally colored. The latter kind of stochastic forcing may cause more complex or more coherent dynamics depending on its spatial correlation properties.