Ice crystal orientation fabric derived from microwave anisotropy at the Northeast Greenland Ice Stream ...

• Main Authors: Nymand, Niels, S. Hvidberg, Christine, Gerber, Tamara A., A. Lilien, David, Steinhage, Daniel, Gogineni, Prasad, Taylor, Drew, Knerr, Nathaniel, Dahl-Jensen, Dorthe
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Greenland; Ice Sheet
• Online Access: https://dx.doi.org/10.57757/iugg23-2724; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019167

<!--!introduction!--> The orientation of ice crystals within large ice masses has a strong influence on its mechanical properties. How susceptible an ice crystal is to deformation is highly dependent on the orientation of the applied stress relative to the crystal's basal plane. Under sustained deformation, the crystals start to reconfigure into a preferred orientation fabric that can soften or stiffen ice considerably. Because ice is a uniaxial birefringent material and its optical axis is normal to the basal plane, the electromagnetic and mechanical properties of ice are closely related. Polarimetric radar measurements can therefore be very valuable for our understanding of the evolution of ice sheets. The Northeast Greenland Ice Stream (NEGIS) is a very distinct feature of the Greenland ice sheet with high flow velocities (~50 m/yr) far inland. The flow configuration of the ice stream is expected to create strong horizontal anisotropy of the bulk crystal orientation, which is observed in the ice ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...