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Audrey Delpech, Claire Ménesguen, Yves Morel, Leif N. Thomas, Frédéric Marin, Sophie Cravatte, and Sylvie Le Gentil

baroclinic mode-1 annual Rossby wave ( Fig. 1 , blue dot), Qiu et al. (2013) were able to reproduce meridionally alternating EEJs in the 5°–40°N latitude band. The configurations and characteristics of the wave forcing as well as the physical interpretation of the processes involved in these numerical experiments differ, however, from study to study. A general framework for interpreting the effects of planetary waves instability on the mean circulation is still missing. In the framework of

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W. K. Dewar, J. C. McWilliams, and M. J. Molemaker

1. Introduction The California Current System is composed of several elements, including the California Undercurrent (CUC), which is the focus of this work. The CUC consists of a poleward current running along the California continental slope, nominally at depths of 50–400 m. It transports warm and relatively salty waters to the North Pacific Subpolar Gyre and is a significant contributor to regional hydrographic properties. The CUC has been measured several times now and is characterized by

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Yang Jiao and W. K. Dewar

advection into the ocean interior. The former mechanism is undoubtedly present in the ocean, but some boundary processes have been recently discovered that might participate importantly in ocean mixing. The objective of this study is to examine the energetics of one of those processes, leading to an evaluation of its regional and global importance. a. Background Interest in mixing comes from a desire to understand the stratification of the ocean and the meridional overturning circulation (MOC). The

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C. Ménesguen, S. Le Gentil, P. Marchesiello, and N. Ducousso

pseudospectral on the horizontal and modal on the vertical [see appendix in Hua et al. (2013) for more details]. Temporal discretization is performed with a leapfrog scheme stabilized by occasional insertion of a trapezoidal correction (predictor–corrector scheme). b. PE model The PE model code is the Coastal and Regional Ocean Community (CROCO) model, a version of the Regional Oceanic Modeling System (ROMS) designed for simulating high-resolution offshore

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