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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Numerical simulation of the circulation within the Perth Submarine Canyon, Western Australia
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Numerical simulation of the circulation within the Perth Submarine Canyon, Western Australia

机译：西澳大利亚州珀斯海底峡谷内环流的数值模拟

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摘要

Surface and sub-surface currents along the ocean boundary of Western Australia were simulated using Regional Ocean Modelling System (ROMS) to examine the circulation within the Perth Canyon. Two major current systems influenced the circulation within the canyon: (1) The Leeuwin current interacted weakly with the canyon as the majority of the canyon was below the depth of the Leeuwin current and (2) Leeuwin undercurrent interacted strongly with the canyon, forming eddies within the canyon at depths of 400-800m. The results indicated that within the canyon, the current patterns changed continuously although there were some repeated patterns. Recurrent eddies produced regions where upwelling or downwelling dominated during the model runs. Deep upwelling was stronger within the canyon than elsewhere on the shelf, but vertical transport in the upper ocean was strong everywhere when wind forcing was applied. Upwelling alone appeared to be insufficient to transport nutrients to the euphotic zone because the canyon rims were deep. Increased upwelling, combined with entrapment within eddies and strong upwelling-favourable winds, which could assist mixing, may account for the high productivity attributed to the canyon. The Leeuwin current is otherwise a strong barrier to the upwelling of nutrients.
机译：使用区域海洋模型系统（ROMS）对西澳大利亚州海洋边界的地表和地下洋流进行了模拟，以检查珀斯峡谷内的环流。有两个主要的洋流系统影响了峡谷内的环流：（1）由于大部分峡谷都在Leeuwin洋流的深度以下，因此Leeuwin洋流与峡谷的相互作用较弱;（2）Leeuwin洋流与峡谷强烈地相互作用，形成了涡流。在峡谷内400-800m的深度。结果表明，在峡谷内，尽管有一些重复的模式，但当前的模式却不断变化。在模型运行期间，反复产生的涡流产生了以上升流或下降流为主的区域。峡谷内的深层上升要比陆架上的其他地方都强，但是在施加强迫作用的情况下，上层海洋的垂直输送在任何地方都非常强。由于峡谷边缘很深，仅上升流似乎不足以将营养物质输送到富营养区。上升流的增加，加上涡流的包裹和强上升流的有利风，这可能有助于混合，这可能是峡谷产生的高生产率的原因。否则，Leeuwin流是阻碍营养物质上升的强大障碍。

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