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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Strategies for nested and eddy-permitting state estimation
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Strategies for nested and eddy-permitting state estimation

机译：嵌套和允许涡流状态估计的策略

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摘要

Both ocean process and prediction studies increasingly rely on state estimation (i.e., data assimilation) to provide the most complete representation of how the ocean circulates. This study applies the formalism and methodology of state estimation, recently developed for the global, coarse-resolution problem, to eddy-permitting state estimation in regional domains. Two major challenges exist for a state estimate that is nested inside a global state estimate: (1) estimation of open-boundary conditions consistent with information interior and exterior to the regional domain and (2) estimation with the higher-resolution models of regional studies. Here a least squares cost function defines the problem of minimizing the misfit between a North Atlantic regional general circulation model and actual observations, including those of the Subduction Experiment. A first experiment, using a novel “multiscale” method to constrain the large-scale regional circulation, shows that the use of the adjoint of both an eddy-permitting model and its coarse-resolution twin leads to a solution of the least squares problem in a computationally practical way. Therefore no fundamental obstacle exists to constraining the large-scale regional circulation nested within a global circulation. A second experiment in the North Atlantic shows that the model circulation can be constrained to the full observational signal, including eddy variability, as observed at selected point locations.
机译：海洋过程和预测研究都越来越依赖于状态估计（即数据同化）来提供最完整的海洋环流表示。这项研究将最近针对全局粗糙分辨率问题开发的状态估计的形式主义和方法应用于区域域中允许涡流的状态估计。对于嵌套在全局状态估计中的状态估计，存在两个主要挑战：（1）与区域域内部和外部信息一致的开放边界条件的估计;（2）使用区域研究的高分辨率模型进行的估计。在这里，最小二乘成本函数定义了一个最小化北大西洋区域总环流模型与实际观测值（包括俯冲实验观测值）之间的不匹配问题。第一个实验使用新颖的“多尺度”方法来约束大规模区域环流，结果表明，使用涡流允许模型及其粗分辨率孪生子的伴随函数可以解决最小二乘问题。一种计算上可行的方式。因此，对于限制嵌套在全球环流中的大规模区域环流没有根本障碍。在北大西洋进行的第二项实验表明，如在选定的点位置观察到的那样，模型的循环可以被约束到完整的观测信号，包括涡流变异性。

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