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

Cited 23 time in wos
Cited 25 time in scopus
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Title
Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet
Other Titles
남극 빙하 하부 지형도 (BedMachine)
Authors
Mathieu, Morlighem
Rignot, Eric
Binder, Tobias
Blankenship, Donald
Drews, Reinhard
Eagles, Graeme
Eisen, Olaf
Ferraccioli, Fausto
Forsberg, Rene
Fretwell, Peter
Goel, Vikram
Greenbaum, Jamin S.
Gudmundsson, Hilmar
Guo, Jingxue
Helm, Veit
Hofstede, Coen
Howat, Ian
Humbert, Angelika
Jokat, Wilfried
Karlsson, Nanna B.
Lee, Won Sang
Matsuoka, Kenichi
Millan, Romain
Mouginot, Jeremie
Paden, John
Pattyn, Frank
Roberts, Jason
Rosier, Sebastian
Ruppel, Antonia
Seroussi, Helene
Smith, Emma C.
Steinhage, Daniel
Sun, Bo
van den Broeke, Michiel R.
van Ommen, Tas D.
van Wessem, Melchior
Young, Duncan A.
Subject
Geology
Issue Date
2019-02
Citation
Mathieu Morlighem, et al. 2019. "Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet". NATURE GEOSCIENCE, 13(1): 1-7.
Abstract
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.
URI
https://repository.kopri.re.kr/handle/201206/10507
DOI
http://dx.doi.org/10.1038/s41561-019-0510-8
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