진학프로석·박사 채용 접수 플랫폼

About the DYNAMICE project: Ice and olivine, the main building crystals of ice sheets and the mantle, respectively, are two of the most anisotropic crystals on Earth. This means that individual crystals have preferred slip systems, along which it is easier to deform them. Depending on the deformation direction with respect to the mean orientation of crystals in both ice and mantle rock, the bulk viscosity can vary by a few orders of magnitude. Such variations in viscosity can greatly affect the flow of ice from ice divides to the sea, as well as the mantle’s viscous response to the unloading of deglaciated ice. As a result, spatial differences in ice texture can locally enhance or slow down ice flow, leading to some areas with faster than average ice loss and others where ice is stabilized. Moreover, in locations where ice loss is fast, and where mantle textures are favourably oriented, the viscous response of the mantle can be fast enough to uplift the ice and slow further ice loss, potentially stabilizing the ice sheet. Hence, anisotropic viscosity might play a critical role in the interplay between ice and mantle dynamics. In DYNAMICE, we will implement a framework to infer anisotropic viscosity from both ice and mantle textures in a numerical flow model. This will open new avenues for understanding solid earth and cryosphere dynamics, and their critical interactions that affect the future of Earth’s ice sheets.

The Postdoctoral fellow will contribute to the project by working towards coupling ice texture evolution and non-linear anisotropic viscous flow law, compare it to similar research on olivine, and help implementing this model into the geodynamic software ASPECT. The aim is to develop a single method for anisotropic flow modelling for both ice and olivine, by mapping CPO parameters directly to anisotropic viscosity parameters. This technique should reduce the computation complexity enough to integrate anisotropic viscosity into 3D dynamic models.

For more information and how to apply: https://www.jobbnorge.no/en/available-jobs/job/279476/postdoctoral-research-fellow-in-ice-rheology