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首页> 外文期刊>Journal of Physical Oceanography >Ekman and Eddy Exchange of Freshwater and Oxygen across the Labrador Shelf Break
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Ekman and Eddy Exchange of Freshwater and Oxygen across the Labrador Shelf Break

机译：拉布拉多搁架间的淡水和氧气的埃克曼和涡流交换

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Transport of freshwater from the Labrador Shelf into the interior Labrador Sea has the potential to impact deep convection via its influence on the salinity of surface waters. To examine this transport, the authors deployed two underwater gliders on a mission to traverse the continental shelf break multiple times between 5 July and 22 August 2014, the period when Arctic meltwater has historically peaked in transport down the Labrador Shelf. The field campaign yielded a unique dataset of temperature, salinity, and oxygen across the shelf break to a depth of 1000 mat unprecedented spatial resolution. Two mechanisms of cross-shelf transport were examined: Ekman transport and transport due to mesoscale eddies. Ekman transport is quantified using satellite wind stress and near-surface hydrographic properties, and eddy-induced transport is scaled using a parameterized eddy diffusivity and thickness gradients of layers of uniform potential density, as well as the tracer gradients along those isopycnals. Both the Ekman and eddy terms transport high-oxygen and low-salinity water from the shelf to the Labrador Sea during the field campaign. The influence of the eddy-driven oxygen flux fromthe shelf to the Labrador Sea on oxygen budgets depends strongly on the size of the region over which this eddy flux converges. The deduced offshore transport of freshwater (4 +/- 6mSv; 1mSv = 10(3) m(3) s(-1)) from both Ekman and eddy mechanisms, which is likely at a seasonal maximum during this summertime survey, represents about 3% of the annual-mean freshwater flowing through Hudson and Davis Straits but may be an important component of the total freshwater budget of the interior Labrador Sea.
机译：将淡水从拉布拉多大陆架运输到内部拉布拉多海中，可能会通过影响地表水盐度而影响深对流。为了研究这种运输，作者在2014年7月5日至8月22日之间多次部署了两个水下滑翔机，以穿越大陆架断裂，这是北极融水历史上一直沿拉布拉多大陆架运输的高峰期。野战活动产生了一个独特的温度，盐度和氧气数据集，这些数据集遍布整个架子，深度达到了1000个席位，具有前所未有的空间分辨率。研究了两种跨架运输机制：埃克曼运输和中尺度涡流运输。利用卫星风应力和近地表水文特性对Ekman输运进行定量，并使用参数化的涡流扩散率和均匀势密度层的厚度梯度以及沿着这些等深线的示踪剂梯度对涡旋诱导的输运进行缩放。在野战期间，Ekman和涡流这两个术语都将高氧和低盐度的水从陆架运到拉布拉多海。从架子到拉布拉多海的涡流驱动的氧气通量对氧气收支的影响在很大程度上取决于该涡流会聚的区域的大小。从Ekman和涡流机制推论得出的淡水近海运输（4 +/- 6mSv; 1mSv = 10（3）m（3）s（-1）），这可能在夏季调查期间处于季节性最大值。流经哈德逊河和戴维斯海峡的年平均淡水的3％，但可能是拉布拉多内陆总淡水预算的重要组成部分。

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  • 来源
    《Journal of Physical Oceanography》 |2018年第5期|1015-1031|共17页
  • 作者

    Howatt Tara; Palter Jaime B.; Matthews John Brian Robin; deYoung Brad; Bachmayer Ralf; Claus Brian;

  • 作者单位

    McGill Univ, Dept Atmospher & Ocean Sci, Montreal, PQ, Canada;

    McGill Univ, Dept Atmospher & Ocean Sci, Montreal, PQ, Canada;

    Mem Univ Newfoundland, Dept Phys & Phys Oceanog, St John, NF, Canada;

    Mem Univ Newfoundland, Dept Phys & Phys Oceanog, St John, NF, Canada;

    Mem Univ Newfoundland, Fac Engn & Appl Sci, St John, NF, Canada;

    Mem Univ Newfoundland, Fac Engn & Appl Sci, St John, NF, Canada;

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