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Sandy Grégorio, Thierry Penduff, Guillaume Sérazin, Jean-Marc Molines, Bernard Barnier, and Joël Hirschi

atmospheric time scales and one 327-yr run forced each year by the same climatological atmospheric annual cycle. The “fully forced” run is comparable to Hirschi et al.’s (2013) hindcasts and yields the so-called total AMOC variability over the last decades. The seasonally forced run isolates the AMOC LF variability that is intrinsic, that is, generated by the ocean without any forcing at these time scales. Using this or similar approaches, Penduff et al. (2011) and Thomas and Zhai (2013) showed the

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Thomas Meunier, Enric Pallàs Sanz, Miguel Tenreiro, José Ochoa, Angel Ruiz Angulo, and Christian Buckingham

interactions, including splitting, as they reach the western GoM’s platform, also referred to as the eddy graveyard ( Biggs and Müller-Karger 1994 ), and the importance of topographic effects in the spindown of LCEs and the diffusion of their tracers is supported by observations of increased diapycnal mixing over the GoM’s sloping boundaries ( Ledwell et al. 2016 ; Dickinson et al. 2017 ). However, Lipphardt et al. (2008) showed, using surface drifters and numerical modeling, that some LCEs experience

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François Ascani, Eric Firing, Julian P. McCreary, Peter Brandt, and Richard J. Greatbatch

Drifter Program ( ; Lumpkin and Johnson 2013 ). The velocity anomaly from the mean and seasonal cycle are used to construct EKE in both the observations and the simulations. Years 25 to 29 are used for the two runs. The black line corresponds to the coastline in the upper panels and to the 200-m isobath in the lower panels. The surface EKE field in solution 2 is overall more realistic than in solution 1. The high EKE region along the NECC in solution

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