A new one‐dimensional (1‐D) parameterization of penetrative convection has been developed in order to have a better representation of the vertical mixing in ocean general circulation models. Our approach is inspired from atmospheric parameterizations of shallow convection which assumes that in the convective boundary layer, the subgrid‐scale fluxes result from two different mixing scales: small eddies, which are represented by an Eddy‐Diffusivity (ED) contribution, and large eddies associated with thermals, which are represented by a mass‐flux contribution. In the present work, the local (small eddies) and nonlocal (large eddies) contributions are unified into an Eddy‐Diffusivity‐Mass‐Flux (EDMF) parameterization which treats simultaneously the whole vertical mixing. EDMF is implemented in the community ocean model NEMO and tested in its 1‐D column version. Deepening of dense water in analytic cases, successfully reproduced in LES simulations, is more realistic with EDMF than with standard diffusion parameterizations. Also the convective events observed in the western Mediterranean at the Lion station and in the North Pacific Ocean at the PAPA station are more realistic in terms of sequencing and amplitude with EDMF.

中文翻译：

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对流建模的涡扩散质量通量参数化

为了更好地表示海洋总环流模型中的垂直混合，已经开发了一种新的渗透对流一维（1-D）参数化方法。我们的方法受到浅层对流的大气参数化的启发，该假设假定在对流边界层中，亚网格尺度通量是由两种不同的混合尺度产生的：小的涡流由涡流扩散率（ED）贡献表示，而大涡流则由大涡流代表与热量相关联，以质量通量贡献表示。在当前工作中，将局部（小涡流）和非局部（大涡流）贡献统一到一个涡流扩散质量通量（EDMF）参数化中，该参数化同时处理整个垂直混合。EDMF在社区海洋模型NEMO中实现，并在其一维列版本中进行了测试。在LES模拟中成功重现的解析案例中的稠密水深，与标准扩散参数化相比，使用EDMF更为现实。此外，在地中海西部的Lion站和北太平洋的PAPA站观察到的对流事件，就用EDMF进行排序和振幅而言更为现实。