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首页> 外文期刊>Journal of Physical Oceanography >Noise-induced Multidecadal Variability In The North Atlantic: Excitation Ofnormal Modes
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Noise-induced Multidecadal Variability In The North Atlantic: Excitation Ofnormal Modes

机译：北大西洋噪声引起的年代际变化：正常模式的激发

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摘要

In this paper it is proposed that the stochastic excitation of a multidecadal internal ocean mode is at the origin of the multidecadal sea surface temperature variability in the North Atlantic. The excitation processes of the spatial sea surface temperature pattern associated with this multidecadal mode within an idealized three-dimensional model are studied by adding noise to the surface heat flux forcing. In the regime where the internal mode is damped, the amplitude of its sea surface temperature pattern depends on the type of noise forcing applied. While the mode is weakly excited by white noise, only the introduction of spatial and temporal coherence in the forcing, with characteristics of the North Atlantic Oscillation in particular, causes the amplitude of the variability to increase to levels comparable to those observed. Within this idealized model the physical mechanism of the excitation can be determined: the presence of the noise rectifies the background state and consequently changes the growth factor of the internal mode.
机译：本文提出，北大西洋多年代际海面温度变化的起源是多年代际内部海洋模式的随机激发。通过在表面热通量强迫中增加噪声，研究了理想化三维模型中与此多年代模式相关的空间海面温度模式的激发过程。在内部模式被衰减的状态下，其海面温度模式的幅度取决于施加的噪声强迫类型。尽管该模式被白噪声弱激发，但仅在强迫中引入时空相干性，尤其是北大西洋涛动的特征，才能使变异性的幅度增加到与观察到的水平相当的水平。在这个理想模型中，可以确定激发的物理机制：噪声的存在会校正背景状态，并因此改变内部模式的增长因子。

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