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首页> 外文期刊>Journal of Physical Oceanography >The Spreading of a Buoyant Plume Beneath a Landfast Ice Cover
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The Spreading of a Buoyant Plume Beneath a Landfast Ice Cover

机译：在陆地冰盖下散布着漂浮的羽状流

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Idealized numerical simulations using the Regional Ocean Modeling System demonstrate the effects of an immobile landfast ice cover that is frictionally coupled to an underice buoyant plume established by river discharge. The discharge rapidly increases and decreases over a 30-day period and has a maximum of 6000 m(3)s(-1). This study examined the response to a landfast ice cover of 26-km width and one that encompasses the entire shelf width. The model setting mimics spring conditions on the Alaskan Beaufort Sea (ABS) shelf. In comparison with the ice-free case subject to the same discharge scenario, underice plumes are broader and deeper, and the downwave freshwater flux is substantially decreased and delayed. Multiple anticyclonic bulges form in the ice-free case, but only a single, large bulge forms when ice is present. These differences are because of the frictional coupling between the ice and plume, which results in an Ekman-like underice boundary layer, a subsurface velocity maximum, and frictional shears that enhance vertical mixing and entrainment. For a partially ice-covered shelf, the plume spreads across the ice edge to form a swift, buoyant, ice-edge jet, whose width accords with the scale of Yankovsky and Chapman for a surface-advected plume. For a fully ice-covered shelf, the buoyant water spreads 60km offshore over a 30-day period. For a steady discharge of 6000m(3)s(-1) and a completely ice-covered shelf, the plume spreads offshore at a rate of similar to 1.5km day(-1) and extends similar to 95km offshore after 60 days.
机译：使用区域海洋建模系统进行的理想数值模拟表明，固定的陆面冰覆层的作用与河流排泄所形成的底冰浮羽摩擦耦合。放电在30天之内迅速增加和减少，最大流量为6000 m（3）s（-1）。这项研究检查了对26公里宽且覆盖整个架子宽度的陆地冰覆的反应。模型设置模拟了阿拉斯加博福特海（ABS）架子上的春季条件。与相同排放情况下的无冰情况相比，冰底羽流更宽，更深，并且下游淡水通量显着降低和延迟。在无冰的情况下会形成多个反气旋凸起，但在有冰的情况下只会形成一个大的凸起。这些差异是由于冰与羽流之间的摩擦耦合造成的，从而形成类似埃克曼的地下冰边界层，地下速度最大值以及增强垂直混合和夹带的摩擦剪切力。对于部分被冰覆盖的架子，羽流在冰边缘扩散，形成一个快速，浮力的冰边缘射流，其宽度与Yankovsky和Chapman的规模一致，形成了一个表面平流羽流。对于完全被冰覆盖的架子，漂浮的水在30天的时间内向海上扩散了60公里。对于6000m（3）s（-1）的稳定排放量和完全被冰覆盖的架子，烟羽以类似于1.5km day（-1）的速率向海上扩散，并在60天后向类似于95km的海上延伸。

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