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Across-Shelf Transport on a Continental Shelf: Do Across-Shelf Winds Matter?

机译：大陆架上的跨架运输：跨架风有影响吗？

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摘要

Wind-forced across-shelf flow on a continental shelf is often described as a two-dimensional balance between flow within a surface boundary layer generated by alongshelf winds and a compensating subsurface flow. Typically, the effects of across-shelf winds are ignored because transport in the surface Ekman layer parallel to winds is assumed zero. Recent studies, however, have shown that the traditional view of across-shelf transport breaks down in shallow waters where friction is important. In this study, a series of two-dimensional simulations is used to show that across-shelf winds can result in across-shelf velocities in the upper few meters of the water column that are similar in magnitude to those generated by alongshelf winds. This circulation has important consequences for the transport of surface-dwelling material, such as blue crab larvae off of Delaware and Chesapeake Bays. The effects of both alongshelf and across-shelf winds on simulated surface dwelling tracer patches are examined. These studies show that across-shelf winds can account for a large amount of surface on- and offshore transport within the stratified outer shelf and, in fact, can be the primary mechanism for across-shelf transport within the friction-dominated inner shelf. Simple estimates of the parameters that describe this transport agree very well with output from the simulations.
机译：大陆架上的风跨架流动通常被描述为沿架风产生的表面边界层内的流动与地下补偿流之间的二维平衡。通常，忽略跨架风的影响，因为假定与风平行的表面埃克曼层中的输运为零。然而，最近的研究表明，传统的跨架运输观点在摩擦很重要的浅水区被打破。在这项研究中，使用一系列二维模拟来显示跨架风可以导致水柱上方几米处的跨架速度，其幅度与沿架风产生的速度相似。这种循环对地表物质的运输具有重要的影响，例如从特拉华州和切萨皮克湾离开的蓝蟹幼虫。研究了沿架风和跨架风对模拟地面居住示踪剂斑块的影响。这些研究表明，跨架风可以解释分层外部搁架内大量的地面上和海上运输，实际上，这可能是在以摩擦为主的内部搁架内跨架运输的主要机制。描述这种传输的参数的简单估计与模拟的输出非常吻合。

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  • 来源
    《Journal of Physical Oceanography》 |2003年第12期|p.2675-2688|共14页
  • 作者

    CHARLES E. TILBURG;

  • 作者单位

    School of Marine Programs, Franklin College of Arts and Sciences, University of Georgia, Athens, GA 30602-3636;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋学;
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