On low-frequency variability of the midlatitude ocean gyres

On low-frequency variability of the midlatitude ocean gyres
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中纬度海洋环流的低频变化

DOI:
10.1017/jfm.2016.208
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发表时间:
2016
影响因子:
3.7
通讯作者:
Shevchenko I
Shevchenko I
中科院分区:
工程技术2区
文献类型:
--
作者:
Shevchenko I

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本文利用旋涡解析准地转模式,研究了风驱动的中纬度海洋环流及其西部边界流(如墨西哥湾流或黑潮)的大尺度低频变率。应用经验正交函数分析湍流解,从统计上提取了集中在西边界流东向喷流延伸附近的稳健且显著的大尺度年代际变化模态。为了动态地解释这些统计模态,我们将控制的准地转方程围绕时间平均循环线性化,并求解相应的线性本征模态及其本征频率。然后,我们将提取的年代际变率在特征模态上进行了预估,发现这种变率是一种多模态相干型现象,而不是像发达湍流之前的流态那样是一种单一模态或几种模态的组合。
This paper studies the large-scale low-frequency variability of the wind-driven midlatitude ocean gyres and their western boundary currents, such as the Gulf Stream or Kuroshio, simulated with the eddy-resolving quasi-geostrophic model. We applied empirical orthogonal functions analysis to turbulent flow solutions and statistically extracted robust and significant large-scale decadal variability modes concentrated around the eastward jet extension of the western boundary currents. In order to interpret these statistical modes dynamically, we linearized the governing quasi-geostrophic equations around the time-mean circulation and solved for the corresponding full set of linear eigenmodes with their eigenfrequencies. We then projected the extracted decadal variability on the eigenmodes and found that this variability is a multimodal coherent pattern phenomenon rather than a single mode or a combination of several modes as in the flow regimes preceding developed turbulence.
高度非线性中纬度耦合模型中低频变化的动力学起源
DOI: --
发表时间: 2006
期刊:
影响因子: --
作者:
S. Kravtsov;P. Berloff;W. Dewar;M. Ghil;J. McWilliams
通讯作者: J. McWilliams
涡旋分辨模式下的多层准地转海洋动力学
DOI: 10.1016/j.ocemod.2015.07.018
发表时间: 2015
期刊: Ocean Modelling
影响因子: 3.2
作者:
Shevchenko I
通讯作者: Shevchenko I
海洋-大气耦合模型中的海洋涡动力学*
DOI: 10.1175/jpo3041.1
发表时间: 2007
影响因子: 3.5
作者:
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通讯作者: J. McWilliams