Document Type

Article

Publication Date

2020

DOI

10.1029/2019GL086522

Publication Title

Geophysical Research Letters

Volume

47

Issue

13

Pages

1-11

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.

Comments

An edited version of this paper was published by AGU. Copyright 2020 American Geophysical Union.

Original Publication Citation

Millan, R., St‐Laurent, P., Rignot, E., Morlighem, M., Mouginot, J., & Scheuchl, B. (2020). Constraining an ocean model under Getz Ice Shelf, Antarctica, using a gravity‐derived bathymetry. Geophysical Research Letters, 47(13), 1-11, Article e2019GL086522. https://doi.org/10.1029/2019GL086522

ORCID

0000-0002-1700-9509 (St-Laurent)

Available for download on Monday, November 30, 2020

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