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首页> 外文期刊>Journal of Physical Oceanography >Adjusting Internal Model Errors through Ocean State Estimation
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Adjusting Internal Model Errors through Ocean State Estimation

机译：通过海洋状态估计调整内部模型误差

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摘要

Oceanic state estimation is a powerful tool to estimate internal model parameters simultaneously with the model's initial conditions and surface forcing field that jointly would bring a model into consistency with time-varying large-scale ocean observations. Here an attempt to estimate geographically varying fields of horizontal and vertical viscosity and diffusivity within a 9-yr-long estimation procedure is presented. The estimated coefficients are highly efficient in preserving watermass characteristics and frontal structures by reducing the model temperature and salinity drift, especially around the Southern Ocean. The estimated mean circulation results in stronger transports of western boundary currents and of the Antarctic Circum-polar Current. Moreover, an increase of about 10% in the strength of the meridional overturning circulation and in the poleward heat transport can be found. Estimated changes in the horizontal mixing coefficients seem to agree with the notion that diapycnal mixing is superfically high with Laplacian mixing formulations, especially close to frontal structures in the ocean. In comparison with adjustments in tracer diffusivities (vertically and horizontally), adjustments of viscosity coefficients are fairly minor outside lateral boundary regions, suggesting that state estimation attempts might be most successful in providing enhanced insight into tracer mixing.
机译：海洋状态估计是一种强大的工具，可以与模型的初始条件和地表强迫场同时估计内部模型参数，这将共同使模型与时变的大规模海洋观测结果保持一致。这里提出了在9年的估算程序中估算水平和垂直粘度和扩散率的地理变化场的尝试。通过降低模型温度和盐度漂移（尤其是在南大洋附近），估计系数对于保持水质特征和额叶结构非常有效。估计的平均环流导致西部边界流和南极圆周极流的更强输运。此外，可以发现子午翻转循环强度和极向热传输强度增加了约10％。水平混合系数的估计变化似乎与以下观点一致：在拉普拉斯混合配方中，斜向混合极高，尤其是靠近海洋的正面构造。与示踪剂扩散性的调整（垂直和水平）相比，在侧向边界区域之外，粘度系数的调整相对较小，这表明状态估计尝试可能最成功地提供了对示踪剂混合的深入了解。

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