A topographically controlled upwelling center off southern Vancouver Island
A topographically controlled upwelling center off southern Vancouver Island
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K. Denman
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作者：
K. Denman
从1979年1月到1981年6月，在加拿大西海岸进行的一项海洋学实验提供了一次大型年度上升流事件的独特视角。上升流是由大规模沿海洋流系统和切断大陆架的狭窄峡谷之间的相互作用驱动的。这种相互作用使得水从比经典的风驱动上升流机制通常预期的深度大得多的深度上升。上涌的水密度大，溶解氧含量极低，营养成分丰富；它起源于加利福尼亚暗流。建立了峡谷/水流相互作用的非线性理论模型，包括实质性的分层。该模型成功地再现了显著的观察结果。
From January 1979 to June 1981 an oceanographic experiment off the west coast of Canada provided a unique view of a large annual upwelling event. The upwelling is driven by an interaction between the large scale coastal current systems and a narrow canyon that cuts the continental shelf. This interaction allows water to be raised from depths much greater than those normally expected from the classical wind-driven upwelling mechanisms. The water upwelled is dense, very low in dissolved oxygen and is rich in nutrients; it originates from the California Undercurrent. A nonlinear theoretical model of the canyon/ current interaction is developed including substantial stratification. The model succeeds in reproducing the salient observations.