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Western boundary upwelling dynamics off Oman

机译：阿曼西部边界上升动态

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摘要

Despite its climatic and ecosystemic significance, the coastal upwelling that takes place off Oman is not well understood. A primitive-equation, regional model forced by climatological wind stress is used to investigate its dynamics and to compare it with the better-known Eastern Boundary Upwellings (EBUs). The solution compares favorably with existing observations, simulating well the seasonal cycles of thermal structure, surface circulation (mean and turbulent), and sea-surface temperature (SST). There is a 1.5-month lag between the maximum of the upwelling-favorable wind-stress-curl forcing and the oceanic response (minima in sea-surface height and SST), which we attribute to onshore-propagating Rossby waves. A southwestward-flowing undercurrent (opposite to the direction of the near-surface flow) is also simulated with a core depth of 1000 m, much deeper than found in EBUs (150-200 m). An EKE budget reveals that, in contrast to EBUs, the upwelling jet is more prone to barotropic than baroclinic instability and the contribution of locally-generated instabilities to EKE is higher by an order of magnitude. Advection and redistribution of EKE by standing mesoscale features also play a significant role in EKE budget.
机译：尽管具有气候和生态意义，但对阿曼沿岸的上升流却知之甚少。使用由气候风应力强迫的原始方程式区域模型来研究其动力学，并将其与更著名的东部边界上升流（EBU）进行比较。该解决方案与现有观测结果相比具有优势，可以很好地模拟热结构，表面循环（平均和湍流）和海表温度（SST）的季节性周期。在上升有利的风应力曲线强迫最大值与海洋响应（海面高度和海表温度的最小值）之间存在1.5个月的滞后，我们将其归因于陆上传播的Rossby波。还模拟了向西南流动的暗流（与近地表水流方向相反），其核心深度为1000 m，比EBU（150-200 m）的深得多。 EKE预算显示，与EBU相比，上升流射流比斜压不稳定更容易产生正压作用，并且局部产生的不稳定对EKE的贡献要大一个数量级。常规的中尺度特征对EKE的平流和再分配在EKE预算中也起着重要作用。

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