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首页> 外文期刊>Journal of Physical Oceanography >Wind-Driven Variability of the Subtropical North Pacific Ocean
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Wind-Driven Variability of the Subtropical North Pacific Ocean

机译：亚热带北太平洋的风变率

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摘要

The Argo array provides a unique dataset to explore variability of the subsurface ocean interior. This study considers the subtropical North Pacific Ocean during the period from 2004 to 2011, when Argo coverage has been relatively complete in time and space. Two distinct patterns of Argo dynamic height transport function (DH) are observed: in 2004/05, the gyre is stronger, and in 2008/09 it is weaker. The orientation of the subtropical gyre also shifts over time: the predominantly zonal major axis shifts to a more northwest-southeast orientation in 2004/05 and to a more southwest-northeast orientation in 2008/09. The limited temporal range of the Argo observations does not allow analysis of the correlation of ocean transport and wind forcing in the basin for the multiyear time scale (6-8-yr period) typical of the dominant gyre patterns. The meridional geostrophic transport anomaly between 180° and 150°E is computed both from Argo data (0-2000 db) and from the Sverdrup relation (using reanalysis winds): similarities are observed in a latitude-time plane, consistent with local forcing playing an important role. A forcing contribution from the eastern subtropics will also reach the region of interest, but on a longer time scale, and it is not analyzed in this study. Compared with the 8-yr Argo record, the longer 19-yr time series of satellite altimetry shows a similar but somewhat modified pattern of variability. A longer Argo record will be needed to observe the decadal-scale fluctuations, to separate interannual and decadal signals, and to ensure statistical confidence in relating the wind forcing and the oceanic response.
机译：Argo阵列提供了一个独特的数据集来探索地下海洋内部的变化性。本研究考虑了2004年至2011年亚热带北太平洋，当时Argo的覆盖在时间和空间上都比较完整。观察到两种不同的Argo动态高度传递函数（DH）模式：2004/05年，回旋强度较强，而2008/09年，回旋强度较弱。亚热带回旋的方向也随时间推移而变化：主要的纬向主轴在2004/05年度向西北偏东南方向移动，在2008/09年度向西南偏东北方向移动。 Argo观测值的时间范围有限，因此无法对占主导地位的回旋模式典型的多年时间尺度（6-8年期）内流域内海洋运输和风力强迫的相关性进行分析。从Argo数据（0-2000 db）和Sverdrup关系（使用重新分析风）计算出180°和150°E之间的子午地转输送异常：在纬度-时间平面上观察到相似，这与局部强迫作用一致重要的角色。东部亚热带的强迫贡献也将到达感兴趣的地区，但时间跨度较长，本研究未对此进行分析。与8年Argo记录相比，更长的19年卫星测高时间序列显示出相似但有所修改的变异性模式。将需要更长的Argo记录来观察年代际尺度的波动，以分离年际和年代际信号，并确保在将强迫和海洋反应联系起来时的统计可信度。

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  • 来源
    《Journal of Physical Oceanography》 |2012年第12期|2089-2100|共12页
  • 作者

    DONATA GlGLIO; DEAN ROEMMICH; SARAH T. GlLLE;

  • 作者单位

    Scripps In stitution of Oceanography, University of California, San Diego, 8622 Kennel Way, La Jolla, CA 92037;

    Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California;

    Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California;

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