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Article dans une revue

Constraining an Ocean Model Under Getz Ice Shelf, Antarctica, Using A Gravity‐Derived Bathymetry

Abstract : Getz Ice Shelf, the largest producer of ice shelf meltwater in Antarctica, buttresses glaciers that hold enough ice to raise sea level by 22 cm. We present a new bathymetry of its sub‐ice shelf cavity using a three‐dimensional inversion of airborne gravity data constrained by multibeam bathymetry at sea and a reconstruction of the bedrock from mass conservation on land. The new bathymetry is deeper than previously estimated with differences exceeding 500 m in a number of regions. When incorporated into an ocean model, it yields a better description of the spatial distribution of ice shelf melt, specifically along glacier grounding lines. While the melt intensity is overestimated because of a positive bias in ocean thermal forcing, the study reveals the main pathways along which warm oceanic water enters the cavity and corroborates the observed rapid retreat of Berry Glacier along a deep channel with a retrograde bed slope.
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https://hal.archives-ouvertes.fr/hal-03026251
Contributeur : Jeremie Mouginot <>
Soumis le : vendredi 16 avril 2021 - 08:10:40
Dernière modification le : samedi 17 avril 2021 - 03:28:28

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2019GL086522.pdf
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INSU | UGA | CNRS | IGE | IRD

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Romain Millan, Pierre St‐laurent, Eric Rignot, Mathieu Morlighem, Jeremie Mouginot, et al.. Constraining an Ocean Model Under Getz Ice Shelf, Antarctica, Using A Gravity‐Derived Bathymetry. Geophysical Research Letters, American Geophysical Union, 2020, 47 (13), ⟨10.1029/2019GL086522⟩. ⟨hal-03026251⟩

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