EGU24-2189, updated on 08 Mar 2024
https://doi.org/10.5194/egusphere-egu24-2189
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Modeling ice and olivine CPO evolution and its affect on large-scale flow in two-way coupled simulations

Nicholas Rathmann1, David Lilien2, Christine Hvidberg1, Aslak Grinsted1, Dorthe Dahl-Jensen1, Klaus Mosegaard1, Ivanka Bekkevold1, and David Prior3
Nicholas Rathmann et al.
  • 1Niels Bohr Institute, University of Copenhagen, Copenhangen, Denmark (rathmann@nbi.ku.dk)
  • 2Department of Earth and Atmospheric Sciences, Indiana University, Indiana, USA
  • 3Department of Geology, University of Otago, Otago, New Zealand

We present a spectral-space CPO model that allows for efficient and seamless simulation of anisotropic polycrystalline flows at large scale, relevant for ice sheets and Earth’s upper mantle. The CPO model is two-way coupled with a bulk orthotropic power-law rheology using a linear grain homogenization scheme, making analytical and frame-independent calculations of CPO-induced viscous anisotropy possible and computationally cheap. The effect of two-way coupling flow and CPO evolution is explored in idealized finite element simulations of ice stream flow and mantle thermal convection. In both cases, we find that strain-rate fields are non-trivially affected, and we briefly discuss the consequences for ice-stream self-reinforcement and the coupling between plate motions and the sublithospheric mantle.

This contribution is mainly focused on introducing our modeling framework “specfab” to the wider community.

How to cite: Rathmann, N., Lilien, D., Hvidberg, C., Grinsted, A., Dahl-Jensen, D., Mosegaard, K., Bekkevold, I., and Prior, D.: Modeling ice and olivine CPO evolution and its affect on large-scale flow in two-way coupled simulations, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-2189, https://doi.org/10.5194/egusphere-egu24-2189, 2024.