| Volumes and Issues Contents of Issue 2 |
www.the-cryosphere.net/4/147/2010/
doi:10.5194/tc-4-147-2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
Polynyas in a dynamic-thermodynamic sea-ice model
Centre for Marine and Atmospheric Research, Institute of Oceanography, University of Hamburg, Hamburg, Germany
Abstract. The representation of polynyas in viscous-plastic dynamic-thermodynamic sea-ice models is studied in a simplified test domain, in order to give recommendations about parametrisation choices. Bjornsson et al. (2001) validated their dynamic-thermodynamic model against a polynya flux model in a similar setup and we expand on that work here, testing more sea-ice rheologies and new-ice thickness formulations. The two additional rheologies tested give nearly identical results whereas the two new-ice thickness parametrisations tested give widely different results. Based on our results we argue for using the new-ice thickness parametrisation of Hibler (1979). We also implement a new parametrisation for the parameter h0 from Hibler's scheme, based on ideas from a collection depth parametrisation for flux polynya models.
Final Revised Paper (PDF, 575 KB) Discussion Paper (TCD)
Citation: Ólason, E. Ö. and Harms, I.: Polynyas in a dynamic-thermodynamic sea-ice model, The Cryosphere, 4, 147-160, doi:10.5194/tc-4-147-2010, 2010. Bibtex EndNote Reference Manager XML
