Assessing the realism of ocean simulations against hydrography and altimetry
Résumé
Future climate prediction systems will include ocean models at eddy-admitting to eddy-resolving resolution , i.e. ¼° on the horizontal or finer. The development and calibration of such models requires the use of more accurate numerical schemes, and the improvement of physical subgrid-scale parameterizations for the ocean interior and its boundaries, including air-sea interactions that drive the global ocean circulation and its feedbacks to the atmosphere. The DRAKKAR consortium is developing a hierarchy of basin-scale to global ocean models (Barnier et al, this issue) to simulate and study the ocean variability driven by realistic atmospheric conditions over the last 50 years without data assimilation. These oceanic hindcasts should help understand the nonlinear interactions between fine scale processes and large-scale ocean dynamics, better interpret and take advantage of satellite and in situ observations (see Penduff et al, 2006, for an overview). However, numerical simulations require quantitative model-observation mis-match evaluations to guide dynamical studies and further model improvements, and careful dynamical assessments
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