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Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet

journal contribution
posted on 2023-05-20, 20:50 authored by Morlighem, M, Rignot, E, Binder, T, Blankenship, D, Drews, R, Eagles, G, Eisen, O, Ferraccioli, F, Forsberg, R, Fretwell, P, Goel, V, Greenbaum, JS, Gudmundsson, H, Guo, J, Helm, V, Hofstede, C, Howat, I, Humbert, A, Jokat, W, Karlsson, NB, Lee, WS, Matsuoka, K, Millan, R, Mouginot, J, Paden, J, Pattyn, F, Jason RobertsJason Roberts, Rosier, S, Ruppel, A, Seroussi, H, Smith, EC, Steinhage, D, Sun, B, van den Broeke, MR, Tasman van OmmenTasman van Ommen, Wessem, Mv, Young, DA
The Antarctic ice sheet has been losing mass over past decades through the accelerated flow of its glaciers, conditioned by ocean temperature and bed topography. Glaciers retreating along retrograde slopes (that is, the bed elevation drops in the inland direction) are potentially unstable, while subglacial ridges slow down the glacial retreat. Despite major advances in the mapping of subglacial bed topography, significant sectors of Antarctica remain poorly resolved and critical spatial details are missing. Here we present a novel, high-resolution and physically based description of Antarctic bed topography using mass conservation. Our results reveal previously unknown basal features with major implications for glacier response to climate change. For example, glaciers flowing across the Transantarctic Mountains are protected by broad, stabilizing ridges. Conversely, in the marine basin of Wilkes Land, East Antarctica, we find retrograde slopes along Ninnis and Denman glaciers, with stabilizing slopes beneath Moscow University, Totten and Lambert glacier system, despite corrections in bed elevation of up to 1 km for the latter. This transformative description of bed topography redefines the high- and lower-risk sectors for rapid sea level rise from Antarctica; it will also significantly impact model projections of sea level rise from Antarctica in the coming centuries.

History

Publication title

Nature Geoscience

Volume

13

Pagination

132-137

ISSN

1752-0894

Department/School

Institute for Marine and Antarctic Studies

Publisher

Nature Publishing Group

Place of publication

United Kingdom

Rights statement

Copyright © 2019, This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply

Repository Status

  • Restricted

Socio-economic Objectives

Antarctic and Southern Ocean ice dynamics

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