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首页> 外文期刊>Journal of Physical Oceanography >Cross-Shelf Dynamics in a Western Boundary Current Regime: Implications for Upwelling
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Cross-Shelf Dynamics in a Western Boundary Current Regime: Implications for Upwelling

机译：西部边界现今制度中的跨层动力学：对上升的影响

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摘要

The cross-shelf dynamics up- and downstream of the separation of the South Pacific Ocean's Western Boundary Current (WBC) are studied using two years of high-resolution velocity and temperature measurements from mooring arrays. The shelf circulation is dominated by the East Australian Current (EAC) and ts eddy field, with mean poleward depth-integrated magnitudes on the shelf break of 0.35 and 0.15 m s~(-1) up-and downstream of the separation point, respectively. The high cross-shelf variability is analyzed though a momentum budget, showing a dominant geostrophic balance at both locations. Among the secondary midshelf terms, the bottom stress influence is higher upstream of the separation point while the wind stress is dominant downstream. This study investigates the response of the velocity and temperature cross-shelf structure to both wind and EAC intrusions. Despite the deep water (up to 140 m), the response to a dominant along-shelf wind stress forcing is a classic two-layer Ekman structure. During weak winds, the shelf encroachment of the southward current drives an onshore Ekman flow in the bottom boundary layer. Both the bottom velocity and the resultant bottom cross-shelf temperature gradient are proportional to the magnitude of the encroaching current, with similar linear regressions up- and downstream of the WBC separation. The upwelled water is then subducted below the EAC upstream of the separation point. Such current-driven upwelling is shown to be the dominant driver of cold water uplift in the EAC-dominated region, with significant impacts expected on nutrient enrichment and thus on biological productivity.
机译：使用两年来从系泊阵列进行的高分辨率速度和温度测量，研究了南太平洋西边界流（WBC）分离前后的跨架动力学。架子循环受东澳大利亚洋流（EAC）和ts涡流场的支配，在分离点上下游分别为0.35和0.15 m s〜（-1），架子断裂处的平均极向深度积分幅度为。通过动量预算分析了较高的跨架变异性，显示了两个位置的主要地转平衡。在次要的中陆架项中，底部应力的影响在分离点的上游较高，而风应力在下游占主导地位。这项研究调查了速度和温度跨架结构对风和EAC入侵的响应。尽管有很深的水（高达140 m），对主要的沿架风应力强迫的响应仍是经典的两层Ekman结构。在弱风中，向南的洋流侵袭带动底部边界层的陆上埃克曼流。底部速度和最终的底部跨架温度梯度均与侵入电流的大小成正比，在WBC分离前后均具有相似的线性回归。然后将上升流的水在分离点上游的EAC下方俯冲。在EAC主导的地区，这种电流驱动的上升流是冷水上升的主要驱动力，预计对养分富集和生物生产力产生重大影响。

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  • 来源
    《Journal of Physical Oceanography》 |2013年第5期|1042-1059|共18页
  • 作者

    Amandine Schaeffer; Moninya Roughan; Bradley D. Morris;

  • 作者单位

    Coastal and Regional Oceanography Laboratory, School of Mathematics and Statistics, University of New South Wales, Sydney, New South Wales, Australia;

    Coastal and Regional Oceanography Laboratory, School of Mathematics and Statistics, University of New South Wales, Sydney, New South Wales, Australia;

    Coastal and Regional Oceanography Laboratory, School of Mathematics and Statistics, University of New South Wales, Sydney, New South Wales, Australia;

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