Abstract Eddy-permitting numerical ocean models resolve mesoscale turbulence only partly, that leads to underestimation of eddy kinetic energy (EKE). Mesoscale dynamics can be amplified by using kinetic energy backscatter (KEB) parameterizations returning energy from the unresolved scales. We consider two types of KEB: stochastic and negative viscosity ones. The tuning of their amplitudes is based on a local budget of kinetic energy, thus, they are ‘energetically-consistent’ KEBs. In this work, the KEB parameterizations are applied to the NEMO ocean model in Double-Gyre configuration with an eddy-permitting resolution (1/4 degree). To evaluate the results, we compare this model with an eddy-resolving one (1/9 degree). We show that the meridional overturning circulation (MOC), meridional heat flux, and sea surface temperature (SST) can be significantly improved with the KEBs. In addition, a better match has been found between the time power spectra of the eddy-permitting and the eddy-resolving model solutions.

中文翻译：

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在 NEMO 海洋模型中测试动能反向散射参数化

摘要 允许涡流的数值海洋模型仅部分解决了中尺度湍流，这导致了涡动能 (EKE) 的低估。中尺度动力学可以通过使用从未解析尺度返回能量的动能反向散射 (KEB) 参数化来放大。我们考虑两种类型的 KEB：随机和负粘度。其振幅的调整基于动能的局部预算，因此，它们是“能量一致的”KEB。在这项工作中，KEB 参数化应用于具有允许涡流分辨率（1/4 度）的双环流配置的 NEMO 海洋模型。为了评估结果，我们将该模型与涡解析模型（1/9 度）进行比较。我们表明，经向翻转环流 (MOC)、经向热通量、使用 KEB 可以显着改善海面温度 (SST)。此外，在允许涡流和涡流解析模型解的时间功率谱之间发现了更好的匹配。