Ocean Science www.ocean-sci.net 1812-0784 1812-0792 3 4 2007 10.5194/os-3-509-2007 http://www.ocean-sci.net/3/509/2007/ http://www.ocean-sci.net/3/509/2007/os-3-509-2007.html http://www.ocean-sci.net/3/509/2007/os-3-509-2007.pdf 509 524 2007-12-20 Influence of numerical schemes on current-topography interactions in 1/4° global ocean simulations T. Penduff thierry.penduff@hmg.inpg.fr J. Le Sommer B. Barnier A.-M. Treguier J.-M. Molines G. Madec Laboratoire des Ecoulements Géophysiques et Industriels, CNRS, UJF, INPG, Grenoble, France Laboratoire de Physique des Océans, CNRS, UBO, IFREMER, Brest, France Laboratoire d'Océanographie et de Climat par Expérimentation et Approche Numérique, CNRS, UPMC, IRD, MNHN, Paris, France The combined use of partial steps and of an energy-enstrophy conserving momentum advection scheme was shown by Barnier et al. (2006) to yield substantial improvements in the surface solution of the DRAKKAR ¼° global sea-ice/ocean model. The present study extends this investigation below the surface with a special focus on the Atlantic and reveals many improvements there as well: e.g. more realistic path, structure and transports of major currents (Gulf Stream, North Atlantic Current, Confluence region, Zapiola anticyclone), behavior of shedded rings, narrower subsurface boundary currents, stronger mean and eddy flows (MKE and EKE) at depth, beneficial enhancement of cyclonic (anticyclonic) flows around topographic depressions (mountains). Interestingly, adding a no-slip boundary condition to this improved model setup cancels most of these improvements, bringing back the biases diagnosed without the improved momentum advection scheme and partial steps (these biases are typical of other models at comparable or higher resolutions). 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