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Ocean Science An interactive open-access journal of the European Geosciences Union
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Volume 9, issue 2
Ocean Sci., 9, 377–390, 2013
https://doi.org/10.5194/os-9-377-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ocean Sci., 9, 377–390, 2013
https://doi.org/10.5194/os-9-377-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 21 Mar 2013

Research article | 21 Mar 2013

The effect of various vertical discretization schemes and horizontal diffusion parameterization on the performance of a 3-D ocean model: the Black Sea case study

G. Shapiro1, M. Luneva2, J. Pickering1, and D. Storkey3 G. Shapiro et al.
  • 1University of Plymouth, School of Marine Science and Engineering, Drake Circus, Plymouth, PL4 8AA, UK
  • 2National Oceanography Centre Liverpool, Joseph Proudman Building, 6 Brownlow Street, Liverpool, L3 5DA, UK
  • 3Met Office, Fitzroy Road, Exeter, Devon, EX1 3PB ,UK

Abstract. Results of a sensitivity study are presented from various configurations of the NEMO ocean model in the Black Sea. The standard choices of vertical discretization, viz. z levels, s coordinates and enveloped s coordinates, all show their limitations in the areas of complex topography. Two new hybrid vertical coordinate schemes are presented: the "s-on-top-of-z" and its enveloped version. The hybrid grids use s coordinates or enveloped s coordinates in the upper layer, from the sea surface to the depth of the shelf break, and z-coordinates are set below this level. The study is carried out for a number of idealised and real world settings. The hybrid schemes help reduce errors generated by the standard schemes in the areas of steep topography. Results of sensitivity tests with various horizontal diffusion formulations are used to identify the optimum value of Smagorinsky diffusivity coefficient to best represent the mesoscale activity.

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