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首页> 外文期刊>Estuarine Coastal and Shelf Science >Dynamics of the Mackenzie River plume on the inner Beaufort shelf during an open water period in summer
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Dynamics of the Mackenzie River plume on the inner Beaufort shelf during an open water period in summer

机译：夏季开放水域内博福特陆架上的麦肯齐河羽流动力学

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摘要

The oceanographic conditions of the Mackenzie River plume in the Arctic Ocean were examined during a 12-day period in August 2007. Field observations in the river channel and the delta region (2-6 m depth), ship-based observations on the shelf and satellite observations of sea surface temperatures indicate that movements of plume density fronts cause changes in water temperatures of over 10 C over a few days. We used a ID model to compare the strength of stratification versus surface wind stress, and a 3D numerical model to simulate the plume motions under forcing from the river flows, local wind and water level variations from tides and wind-driven surge. The results indicate that the coastal region is stratified with a ~2 m thick surface plume even in water depths of 3-4 m, resulting in strong vertical variation of horizontal currents. Moderate easterly winds of 5-10 m/s are sufficient to induce offshore transport of the surface plume and onshore transport of the deeper shelf water, leading to large fluctuations in temperature and salinity in the coastal region. This study examined a period of offshore transport and mean water level set-down, and indicates the rapid response of the plume to wind over the shallow delta.
机译：在2007年8月的12天中检查了北冰洋Mackenzie河羽流的海洋学条件。在河道和三角洲地区（深度2-6 m）进行了实地观测，对架子和海底进行了船基观测。卫星对海面温度的观测表明，羽状密度前沿的运动在几天内导致水温变化超过10C。我们使用了一个ID模型来比较分层强度和表面风应力，并使用一个3D数值模型来模拟在河流作用下的羽流运动，潮汐和风浪引起的局部风和水位变化。结果表明，即使在3-4 m的水深中，沿海地区也有〜2 m厚的表层羽流分层，导致水平流的垂直变化很大。 5-10 m / s的中度东风足以引起表层羽流的近海运输和深层架子水的陆上运输，从而导致沿海地区温度和盐度的大幅波动。这项研究检查了一段海上运输和平均水位下降，并指出了羽流对浅三角洲上风的快速响应。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2010年第3期|p.214-220|共7页
  • 作者

    Ryan P. Mulligan; Will Perrie; Steve Solomon;

  • 作者单位

    Department of Geological Sciences and the Institute for Coastal Science and Policy, East Carolina University, 391 Flanagan Blgd, Greenville, NC 27858, United States;

    rnFisheries and Oceans Canada, Bedford Institute of Oceanography, 1 Challenger Dr., Dartmouth, NS, B2Y 4A2, Canada;

    rnNatural Resources Canada, Geological Survey of Canada (Atlantic), 1 Challenger Dr., Dartmouth, NS, B2Y 4A2, Canada;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    river plumes; coastal circulation; arctic environments; stratification;

    机译：河羽沿海环流;北极环境;分层;

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