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Ocean Dynamics

, Volume 68, Issue 10, pp 1239–1258 | Cite as

A multi-envelope vertical coordinate system for numerical ocean modelling

  • Diego Bruciaferri
  • Georgy I. Shapiro
  • Fred Wobus
Article

Abstract

A multi-envelope generalised coordinate system for numerical ocean modelling is introduced. In this system, computational levels are curved and adjusted to multiple ‘virtual bottoms’ (aka envelopes) rather than following geopotential levels or the actual bathymetry. This allows defining computational levels which are optimised to best represent different physical processes in different sub-domains of the model. In particular, we show how it can be used to improve the representation of tracer advection in the ocean interior. The new vertical system is compared with a widely used z-partial step scheme. The modelling skill of the models is assessed by comparison with the analytical solutions or results produced by a model with a very high-resolution z-level grid. Three idealised process-oriented numerical experiments are carried out. Experiments show that numerical errors produced by the new scheme are much smaller than those produced by the standard z-partial step scheme at a comparable vertical resolution. In particular, the new scheme shows superiority in simulating the formation of a cold intermediate layer in the ocean interior and in representing dense water cascading down a steep topography.

Keywords

Ocean modelling Vertical coordinate Oceanic transport 

Notes

Acknowledgments

The authors are grateful to the valuable comments and suggestions of the two anonymous reviewers which have greatly contributed to improving the manuscript.

Funding information

This work was funded by the EASME/EMFF/2014/ 1.3.1.3/LOT4/SI2.709436 - Seabasin Checkpoints - Lot 4 - ‘BLACK SEA’ project.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Faculty of Science and EngineeringUniversity of PlymouthPlymouthUK
  2. 2.Shirshov Institute of OceanologyMoscowRussia

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