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首页> 外文期刊>Ocean Dynamics >Multi-platform model assessment in the Western Mediterranean Sea: impact of downscaling on the surface circulation and mesoscale activity
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Multi-platform model assessment in the Western Mediterranean Sea: impact of downscaling on the surface circulation and mesoscale activity

机译：地中海西部的多平台模型评估：降尺度对地表环流和中尺度活动的影响

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In numerical ocean modeling, dynamical downscaling is the approach consisting in generating high-resolution regional simulations exploiting the information from coarser resolution models for initial and boundary conditions. Here we evaluate the impacts of downscaling the 1/16(o) (similar to 6-7 km) CMEMS Mediterranean reanalysis model solution into a high-resolution 2-km free-run simulation over the Western Mediterranean basin, focusing on the surface circulation and mesoscale activity. Multi-platform observations from satellite-borne altimeters, high-frequency radar, fixed moorings, and gliders are used for this evaluation, providing insights into the variability from basin to coastal scales. Results show that the downscaling leads to an improvement of the time-averaged surface circulation, especially in the topographically complex area of the Balearic Sea. In particular, the path of the Balearic current is improved in the high-resolution model, also positively affecting transports through the Ibiza Channel. While the high-resolution model produces a similar number of large eddies as CMEMS Med Rea and altimetry, it generates a much larger number of small-scale eddies. Looking into the variability, in the absence of data assimilation, the high-resolution model is not able to properly reproduce the observed phases of mesoscale structures, especially in the southern part of the domain. This negatively affects the representation of the variability of the surface currents interacting with these eddies, highlighting the importance of data assimilation in the high-resolution ocean model in this region to constrain the evolution of these mesoscale structures.
机译：在数值海洋建模中，动态降尺度是一种方法，该方法可生成高分辨率区域模拟，并利用来自较粗糙分辨率模型的信息来获取初始条件和边界条件。在这里，我们评估了将1/16（o）（类似于6-7 km）CMEMS地中海再分析模型解决方案缩减为对西地中海盆地的高分辨率2 km自由运行模拟的影响，重点是地表环流和中尺度活动。此评估使用了来自卫星高度计，高频雷达，固定式系泊设备和滑翔机的多平台观测结果，从而提供了从盆地到沿海尺度变化的见解。结果表明，按比例缩小导致了时均表面环流的改善，尤其是在巴利阿里海的地形复杂区域。特别是，在高分辨率模型中改善了巴利阿里海流的路径，也对通过伊维萨海峡的运输产生了积极影响。高分辨率模型产生的大涡旋数量与CMEMS Med Rea和测高仪相似，但它产生的小涡旋数量却大得多。观察变异性，在没有数据同化的情况下，高分辨率模型无法正确再现观测到的中尺度结构的相，特别是在该领域的南部。这不利地影响了与这些涡旋相互作用的地表电流变化性的表示，突出了该地区高分辨率海洋模型中数据同化对限制这些中尺度结构演化的重要性。

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