Geophysical Research Letters
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.
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
Millan, Romain; St-Laurent, Pierre; Rignot, Eric; Morlighem, Mathieu; Mouginot, Jeremie; and Scheuchl, Bernd, "Constraining an Ocean Model Under Getz Ice Shelf, Antarctica, Using a Gravity‐Derived Bathymetry" (2020). CCPO Publications. 350.