EGU21-1373
https://doi.org/10.5194/egusphere-egu21-1373
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Alternative viscous-plastic rheologies for the representation of fracture lines in high-resolution sea ice models

Damien Ringeisen1, Martin Losch1, and L. Bruno Tremblay2
Damien Ringeisen et al.
  • 1Alfred Wegener Institute, Climate Science - Climate Dynamics, Bremerhaven, Germany
  • 2McGill University, Department of Atmospheric and Oceanic Sciences, Montréal, Canada

Fracture lines dominate the dynamics of sea ice. They affect the ice mass balance and the heat transfer between the atmosphere and the ocean. Therefore, climate modeling and sea ice prediction require an accurate fracture representation. Most sea ice models use viscous-plastic (VP) rheologies to simulate sea ice internal stresses. One of the issues with these rheologies is that they overestimate the intersection angles between fracture lines, with consequences for the subsequent sea ice drift. In idealized experiments, we investigate the mechanisms linking VP rheologies and fracture angles and assess alternative rheologies for high-resolution modeling. Results show that the definition of the transition between viscous and plastic states is essential for the creation of sharp fracture lines. The fracture angles with Mohr-Coulomb yield curves agree with the Arthur fault orientation theory. Further, rheologies with Mohr-Coulomb yield curves or teardrop yield curves appear to reduce intersection angles. Finally, experiments show that these results are reproduced for different sea ice initial conditions. With rheologies that favor smaller intersection angles, sea ice models move a step closer to accurate sea ice dynamics at high-resolution.

How to cite: Ringeisen, D., Losch, M., and Tremblay, L. B.: Alternative viscous-plastic rheologies for the representation of fracture lines in high-resolution sea ice models, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-1373, https://doi.org/10.5194/egusphere-egu21-1373, 2021.

Display materials

Display file

Comments on the display material

to access the discussion