Towards modelling of corrugation ridges at ice-sheet grounding lines
نویسندگان
چکیده
Abstract. Improvements in the resolution of sea-floor mapping techniques have revealed extremely regular, sub-metre-scale ridge landforms produced by tidal flexure ice-shelf grounding lines as they retreated very rapidly (i.e. at rates several kilometres per year). Guided such novel observations from Thwaites Glacier, West Antarctica, we present three mathematical models for formation these corrugation ridges a tidally migrating line (that is retreating constant rate), where each formed either till flux to line, extrusion or resuspension and transport grains grounding-zone bed. We find that both (squeezing out like toothpaste ice sheet re-settles on sea floor) material can qualitatively reproduce delicate described observations. By considering known properties subglacial sediments, agree with existing schematic most likely mechanism low-tide position, essentially preserving an imprint ice-sheet it retreated. However, when realistic (shallow) bed slopes are used simulations, start overprint one another, suggesting that, preserve regular been observed, retreat (driven dynamic thinning?) may be even higher than previously thought.
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ژورنال
عنوان ژورنال: The Cryosphere
سال: 2023
ISSN: ['1994-0424', '1994-0416']
DOI: https://doi.org/10.5194/tc-17-2645-2023