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首页> 外文期刊>Journal of Physical Oceanography >Spatiotemporal Variability of the Global Ocean Internal Processes Inferred from Satellite Observations
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Spatiotemporal Variability of the Global Ocean Internal Processes Inferred from Satellite Observations

机译：通过卫星观测推断的全球海洋内部过程的时空变化

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摘要

Using a new analysis tool, namely, multiscale window transform (MWT), and the MWT-based theory of canonical transfer, this study investigates the spatiotemporal variations of the nonlinear interactions among the mean flows, interannual variabilities, quasi-annual fluctuations, and eddies in the global ocean. It is found that the canonical kinetic energy (KE) transfers are highly inhomogeneous in space, maximized in the western boundary current (WBC), Southern Ocean, and equatorial regions. In contrast to the equatorial and WBC regions where the temporal KE cascades are mainly forward, the Southern Ocean is the very place where coherent large-scale patterns of inverse KE cascade take place. The canonical transfers are also found to be highly variable in time. Specifically, in the Kuroshio Extension, the transfer from the mean flow to the interannual variability is in pace with the external winds from the eastern North Pacific; in the subtropical gyre, the mean flow-to-eddy transfer is responsible for the variability of the eddy kinetic energies (EKE) at both interannual and seasonal scales; in the tropics, the downscale transfers to the eddies from the other three scales all contribute to the interannual modulation of the EKE, and these transfers tend to decrease (increase) during El Nino (La Nina) events. In the Southern Ocean, the high-frequency eddies are found to feed KE to the low-frequency variability through temporal inverse cascade processes, which have been strengthened due to the enhanced eddy activities in the recent decade. Also discussed here is the relation between the seasonal EKE variability and the eddy-quasi-annual fluctuation interaction.
机译：使用一种新的分析工具，即多尺度窗口变换（MWT）和基于MWT的规范传递理论，本研究调查了平均流量，年际变化，准年际波动和涡流之间的非线性相互作用的时空变化。在全球海洋中。发现典型的动能（KE）在空间上高度不均匀，在西边界流（WBC），南大洋和赤道区域最大。与时空KE级联主要朝前的赤道和WBC地区相反，南大洋正是KE逆级联的连贯大规模模式发生的地方。还发现规范传输的时间变化很大。具体而言，在黑潮延期中，从平均流量到年际变化的转变与北太平洋东部的外风同步。在亚热带回旋中，平均年际涡流的传递是造成年际和季节尺度上涡动能（EKE）变化的原因。在热带地区，从其他三个尺度向涡流的降尺度转移都有助于EKE的年际调制，并且在厄尔尼诺（La Nina）事件期间，这些转移趋于减少（增加）。在南大洋，发现高频涡流通过时间逆级联过程将KE馈入低频变化，由于近十年来涡流活动的增强，这种现象得到了加强。这里还讨论了季节性EKE变异性与涡旋-准年波动相互作用之间的关系。

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  • 来源
    《Journal of Physical Oceanography》 |2019年第8期|2147-2164|共18页
  • 作者

    Yang Yang; Liang X. San;

  • 作者单位

    Nanjing Univ Informat Sci & Technol Sch Marine Sci Nanjing Jiangsu Peoples R China|Nanjing Univ Informat Sci & Technol Ctr Ocean Atmosphere Dynam Studies Nanjing Jiangsu Peoples R China;

    Nanjing Univ Informat Sci & Technol Ctr Ocean Atmosphere Dynam Studies Nanjing Jiangsu Peoples R China|Nanjing Univ Informat Sci & Technol Sch Atmospher Sci Sch Marine Sci Nanjing Jiangsu Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Southern Ocean; ENSO; Instability; Mesoscale processes; Interannual variability; Oceanic variability;

    机译：南部海洋;ENSO;不稳定;中尺度过程;年际变化;海洋变化;

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