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首页> 外文期刊>Journal of Physical Oceanography >A New Solution of a Nonlinear Model of Upwelling
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A New Solution of a Nonlinear Model of Upwelling

机译：上升流非线性模型的新解

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摘要

A two-dimensional, frictionless, nonlinear model of coastal upwelling is reexamined. The model has been solved previously at steady state and as an initial-value problem. The previous solution to the initial-value problem is inconsistent with the steady-state solution. A new solution to the spinup problem is presented that approaches the existing steady-state solution. In the new solution, a surface equatorward jet develops more rapidly than a poleward undercurrent, but the surface jet is of limited strength so that the undercurrent velocity eventually surpasses that of the surface flow. Consideration of dimensional scales implies that the magnitude of the wind stress determines how quickly steady state is approached but does not affect the steady-state fields. Exact solutions found with an arbitrary alongshore pressure gradient imply that there is no poleward flow without a poleward pressure gradient.
机译：重新研究了海岸上升流的二维，无摩擦非线性模型。该模型先前已在稳态下作为初始值问题求解。先前对于初值问题的解决方案与稳态解决方案不一致。提出了一种解决旋转加速问题的新解决方案，该解决方案接近现有的稳态解决方案。在新的解决方案中，赤道面的射流比极地的暗流发展得更快，但表面射流的强度有限，因此暗流的速度最终超过了地表流的速度。尺寸尺度的考虑意味着风应力的大小决定了达到稳态的速度有多快，但不影响稳态场。用任意的沿岸压力梯度找到的精确解意味着没有极向压力梯度就没有极向流动。

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