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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >A coastal current in winter: 2. Wind forcing and cooling of a coastal current east of Cape Cod
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A coastal current in winter: 2. Wind forcing and cooling of a coastal current east of Cape Cod

机译：冬季的沿海气流：2.鳕鱼角以东的沿海气流的强迫和降温

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摘要

The combined effect of cooling and wind-driven buoyancy flux (WDBF) on a buoyant coastal current east of Cape Cod is investigated using observations and process-oriented numerical modeling. Theoretical considerations show that with the moderately strong surface density gradients observed in the Outer Cape Cod Coastal Current, WDBF can substantially exceed the buoyancy loss due to cooling, especially during intense winter storms. Evidence of deep convection associated with strong negative WDBF during downwelling-favorable winds is clearly seen in the moored observations. A simplified two-dimensional numerical model is used to illustrate the evolution of wind- and buoyancy-driven cross-shelf overturning circulation in response to surface cooling and episodic storm events. The simulation confirms that WDBF plays an important role in driving subduction of cold surface water at the offshore surface outcrop of the coastal current font. The presence of the coastal current is also shown to block onshore Ekman transport. As a result, the downwelling circulation in a cross-shore plane is predicted to have a complex multicell structure, in which exchange between the inner shelf and midshelf is restricted. The downwelling circulation has a major impact on the cross-shelf origin of cold, dense shelf waters contributing to intermediate layers of the Wilkinson Basin of the Gulf of Maine.
机译：利用观测和面向过程的数值模型研究了冷却和风驱动的浮力通量（WDBF）对科德角以东的浮力沿海流的综合影响。理论上的考虑表明，在鳕鱼角外海流中观察到中等强度的表面密度梯度后，WDBF可以大大超过由于冷却而产生的浮力损失，尤其是在强烈的冬季暴风雨期间。在停泊的有利风中，与强负WDBF相关的深层对流证据在系泊观测中清晰可见。使用简化的二维数值模型来说明风和浮力驱动的跨架翻转翻转环流对地表降温和突发性暴雨事件的响应。模拟证实，WDBF在驱动沿海流型近海表层露头的冷地表水俯冲中起重要作用。沿海水流的存在也显示出阻碍了陆上埃克曼运输。结果，预计跨岸平面中的下行流环流具有复杂的多单元结构，其中内层架和中层架之间的交换受到限制。下行流对冷，密集架子水的跨架成因有重大影响，这有助于缅因湾的威尔金森盆地的中间层。

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