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首页> 外文期刊>Journal of Physical Oceanography >The Dispersal of Dense Water Formed in an Idealized Coastal Polynya on a Shallow Sloping Shelf
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The Dispersal of Dense Water Formed in an Idealized Coastal Polynya on a Shallow Sloping Shelf

机译：在一个理想的沿海坡地上，在一个浅倾斜的架子上形成的浓水弥散

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摘要

This study examines the dispersal of dense water formed in an idealized coastal polynya on a sloping shelf in the absence of ambient circulation and stratification. Both numerical and laboratory experiments reveal two separate bottom pathways for the dense water: an offshore plume moving downslope into deeper ambient water and a coastal current flowing in the direction of Kelvin wave propagation. Scaling analysis shows that the velocity of the offshore plume is proportional not only to the reduced gravity, bottom slope, and inverse of the Coriolis parameter, but also to the ratio of the dense water depth to total water depth. The dense water coastal current is generated by the along-shelf baroclinic pressure gradient. Its dynamics can be separated into two stages: (ⅰ) near the source region, where viscous terms are negligible, its speed is proportional to the reduced gravity wave speed and (ⅱ) in the far field, where bottom drag becomes important and balances the pressure gradient, the velocity is proportional to H_c[g'l{L C_d)]~(1/2) in which H_c is the water depth at the coast, g' the reduced gravity, C_d the quadratic bottom drag coefficient, and L the along-shelf span of the baroclinic pressure gradient. The velocity scalings are verified using numerical and laboratory sensitivity experiments. The numerical simulations suggest that only 3%-23% of the dense water enters the coastal pathway, and the percentage depends highly on the ratio of the velocities of the offshore and coastal plumes. This makes the velocity ratio potentially useful for observational studies to assess the amount of dense water formed in coastal polynyas.
机译：这项研究研究了在没有环境循环和分层的情况下，理想化的沿海多年生植物在倾斜的架子上形成的浓水的扩散情况。数值实验和实验室实验都揭示了致密水的两个单独的底部路径：一个向下羽流向下移动到更深的环境水中的近海羽状流和一个沿开尔文波传播方向流动的沿海水流。比例分析表明，近海羽状流的速度不仅与减小的重力，底部坡度和科里奥利参数的倒数成比例，而且与浓水深度与总水深之比成正比。沿架斜压梯度产生密集的沿海水流。它的动力学可以分为两个阶段：（ⅰ）在源区附近，其中粘性项可以忽略不计，其速度与减小的重力波速度成正比；（ⅱ）在远场中，底部阻力变得很重要并平衡了压力梯度，速度与H_c [g'l {L C_d）]〜（1/2）成比例，其中H_c是海岸上的水深，g'是重力减小，C_d是二次底部阻力系数，L斜压梯度的沿架跨度。使用数字和实验室灵敏度实验验证了速度定标。数值模拟表明，只有3％-23％的浓水进入沿海通道，并且该百分比高度依赖于近海和沿海羽流的速度比。这使得速度比可能对观察研究评估沿海多ny鱼类形成的浓水量有用。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第6期|1563-1581|共19页
  • 作者

    Weifeng G. Zhang; Claudia Cenedese;

  • 作者单位

    Applied Ocean Physics and Engineering Department, Woods Hole Oceanographic Institution, 266 Woods Hole Road, Woods Hole, MA 02543.;

    Physical Oceanography Department, Woods Hole Oceanographic Institution,Woods Hole, Massachusetts;

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