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首页> 外文期刊>Journal of Physical Oceanography >Offshore Transport of Dense Water from the East Greenland Shelf
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Offshore Transport of Dense Water from the East Greenland Shelf

机译：东部格陵兰岛架空密集水的海上运输

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摘要

Data from a mooring deployed at the edge of the East Greenland shelf south of Denmark Strait from September 2007 to October 2008 are analyzed to investigate the processes by which dense water is transferred off the shelf. It is found that water denser than 27.7 kg m~(-3)-as dense as water previously attributed to the adjacent East Greenland Spill Jet-resides near the bottom of the shelf for most of the year with no discernible seasonality. The mean velocity in the central part of the water column is directed along the isobaths, while the deep flow is bottom intensified and veers offshore. Two mechanisms for driving dense spilling events are investigated, one due to offshore forcing and the other associated with wind forcing. Denmark Strait cyclones propagating southward along the continental slope are shown to drive off-shelf flow at their leading edges and are responsible for much of the triggering of individual spilling events. Northerly barrier winds also force spilling. Local winds generate an Ekman downwelling cell. Nonlocal winds also excite spilling, which is hypothesized to be the result of southward-propagating coastally trapped waves, although definitive confirmation is still required. The combined effect of the eddies and barrier winds results in the strongest spilling events, while in the absence of winds a train of eddies causes enhanced spilling.
机译：分析了2007年9月至2008年10月在丹麦海峡以南的东格陵兰陆架边缘部署的系泊设备的数据，以研究浓水从陆架运出的过程。发现在一年中的大部分时间里，密度大于27.7 kg m〜（-3）的水的密度与先前归因于相邻格陵兰岛溢流的水一样，大部分时间位于架子底部附近，没有明显的季节性。水柱中心部分的平均速度沿等压线方向，深水流则在底部增大，并且转向近海。研究了驱动密集溢出事件的两种机制，一种是由于近海强迫造成的，另一种是由于风力造成的。沿海陆斜坡向南传播的丹麦海峡气旋显示在其前缘带动现成的流动，并在很大程度上触发了个别的溢漏事件。偏北风也迫使溢出。局部风产生埃克曼下降单元。非局部风也引起溢出，尽管仍需要确定性的确认，但非本地风也可能是向南传播的沿海被困波的结果。涡流和阻风的共同作用导致最强烈的溢流事件，而在没有风的情况下，一系列涡流导致溢流增强。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第1期|229-245|共17页
  • 作者

    B. E. Harden; R. S. Pickart; I. A. Renfrew;

  • 作者单位

    University of East Anglia, Norwich, United Kingdom Woods Hole Oceanographic Institution, 266 Woods Hole Road, Woods Hole, MA 02543;

    Woods Hole Oceanographic Institution, Woods Hole, Massachusetts;

    University of East Anglia, Norwich, United Kingdom;

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