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首页> 外文期刊>Journal of Physical Oceanography >The Impact of Locally Enhanced Vertical Diffusivity on the Cross-Shelf Transport of Tracers Induced by a Submarine Canyon
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The Impact of Locally Enhanced Vertical Diffusivity on the Cross-Shelf Transport of Tracers Induced by a Submarine Canyon

机译：局部增强的垂直扩散率对海底峡谷引起的示踪剂跨架运输的影响

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摘要

The exchanges of water, nutrients, and oxygen between the coastal and open ocean are key components of on-shelf nutrient budgets and biogeochemical cycles. On a regional scale, submarine canyons enhance physical processes such as shelf-slope mass exchange and mixing. There is good understanding of the flow around upwelling submarine canyons; however, the flux of biologically relevant tracers is less understood. This work investigates the impact of submarine canyons on the cross-shelf exchange of tracers and water, taking into account the impact of locally enhanced mixing within the canyon, and develops a scaling estimate for canyon-induced upwelling of tracers, proportional to local concentration, vertical diffusivity, and previously scaled upwelling flux. For that purpose, we performed numerical experiments simulating an upwelling event near an idealized canyon, adding a passive tracer with an initially linear profile. We varied the geographic distribution of vertical eddy diffusivity and its magnitude, the initial stratification, the Coriolis parameter, and the strength of the incoming flow. We find that a canyon of width 5% of the along-shelf length of the shelf upwells between 25% and 89% more tracer mass onto the shelf than shelfbreak upwelling. Locally enhanced vertical diffusivity has a positive effect on the tracer that is advected by the upwelling flow and can increase canyon-upwelled tracer flux by up to 27%.
机译：沿海和远洋之间水，养分和氧气的交换是现成养分预算和生物地球化学循环的关键组成部分。在区域范围内，海底峡谷增强了物理过程，例如架子-斜坡的质量交换和混合。对上升的海底峡谷周围的水流有很好的了解；然而，对生物学相关示踪剂的通量了解较少。这项工作研究了海底峡谷对示踪剂和水跨架交换的影响，同时考虑到了峡谷内局部增强的混合的影响，并针对与局部浓度成正比的峡谷诱发的示踪剂上升提出了比例估算，垂直扩散率和先前按比例缩放的上升流。为此，我们进行了数值实验，模拟了理想峡谷附近的上升流事件，并添加了具有初始线性轮廓的无源示踪剂。我们改变了垂直涡流扩散率的地理分布及其大小，初始分层，科里奥利参数和流入流的强度。我们发现，一个宽度为架子沿架长度的5％的峡谷向上架的示踪剂质量要比架子向上架高25％至89％。局部增强的垂直扩散率对示踪剂产生积极影响，该示踪剂由上升流平流，并且可以使峡谷上升流的示踪剂通量最多增加27％。

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