Accessibility navigation

Coupled bistable maps: a tool to study convection parameterization ocean models

Lind, P. G., Titz, S., Kuhlbrodt, T. ORCID:, Corte-Real, J. A. M., Kurths, J., Gallas, J. A. C. and Feudel, U. (2004) Coupled bistable maps: a tool to study convection parameterization ocean models. International Journal of Bifurcation and Chaos, 14 (03). pp. 999-1015. ISSN 1793-6551

Full text not archived in this repository.

It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing.

To link to this item DOI: 10.1142/S0218127404009648


Ocean convection is a highly non-linear and local process. Typically, a small-scale phenomenon of this kind entails numerical problems in the modelling of ocean circulation. One of the tasks to solve is the improvement of convection parameterization schemes, but the question of grid geometry also plays a considerable role. Here, this question is studied in the context of global ocean models coupled to an atmosphere model. Such ocean climate models have mostly structured, coarsely resolved grids. Using a simple conceptual two-layer model, we compare the discretization effects of a rectangular grid with those of a grid with hexagonal grid cells, focussing on average properties of the ocean. It turns out that systematic errors tend to be clearly smaller with the hexagonal grid. In a hysteresis experiment with the atmospheric boundary condition as a hysteresis parameter, the spatially averaged behaviour shows non-negligible artificial steps for quadratic grid cells. This bias is reduced with the hexagonal grid. The same holds for the directional sensitivity (or horizontal anisotropy) which is found for different angles of the advection velocity. The grid with hexagonal grid cells shows much more isotropic results. From the limited viewpoint of these test experiments, it seems that the hexagonal grid (i.e. icosahedral–hexagonal grids on the sphere) is recommendable for ocean climate models.

Item Type:Article
Divisions:No Reading authors. Back catalogue items
ID Code:111692
Publisher:World Scientific

University Staff: Request a correction | Centaur Editors: Update this record

Page navigation