Simulating higher-order fabric structure in a coupled, anisotropic ice-flow model: application to Dome C

Author:

Lilien David A.ORCID,Rathmann Nicholas M.ORCID,Hvidberg Christine S.ORCID,Grinsted AslakORCID,Ershadi M. Reza,Drews ReinhardORCID,Dahl-Jensen DortheORCID

Abstract

Abstract Ice-crystal fabric can induce mechanical anisotropy that significantly affects flow, but ice-flow models generally do not include fabric development or its effect upon flow. Here, we incorporate a new spectral expansion of fabric, and more complete description of its evolution, into the ice-flow model Elmer/Ice. This approach allows us to model the effect of both lattice rotation and migration recrystallization on large-scale ice flow. The fabric evolution is coupled to flow using an unapproximated non-linear orthotropic rheology that better describes deformation when the stress and fabric states are misaligned. These improvements are most relevant for simulating dynamically interesting areas, where recrystallization can be important, tuning data are scarce and rapid flow can lead to misalignment between stress and fabric. We validate the model by comparing simulated fabric to ice-core and phase-sensitive radar measurements on a transect across Dome C, East Antarctica. With appropriately tuned rates for recrystallization, the model is able to reproduce observations of fabric. However, these tuned rates differ from those previously derived from laboratory experiments, suggesting a need to better understand how recrystallization acts differently in the laboratory compared to natural settings.

Funder

Villum Fonden

Deutsche Forschungsgemeinschaft

Canada Excellence Research Chairs, Government of Canada

Publisher

Cambridge University Press (CUP)

Subject

Earth-Surface Processes

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Autonomous Rover Enables Radar Profiling of Ice-Fabric Properties in Antarctica;IEEE Transactions on Geoscience and Remote Sensing;2024

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