Bathymetric Control on Borchgrevink and Roi Baudouin Ice Shelves in East Antarctica
The stability of ice shelves and drainage of ice sheets they buttress is largely determined by melting at their atmospheric and oceanic interfaces. Subglacial bathymetry can impact ice shelf stability because it influences the onset and the pattern of warm ocean water incursions into the cavities be...
Published in: | Journal of Geophysical Research: Earth Surface |
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2021
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Online Access: | https://doi.org/10.1029/2021JF006342 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9774 |
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ftsubggeo:oai:e-docs.geo-leo.de:11858/9774 2023-05-15T13:42:31+02:00 Bathymetric Control on Borchgrevink and Roi Baudouin Ice Shelves in East Antarctica Eisermann, Hannes Eagles, Graeme Ruppel, Antonia Stefanie Läufer, Andreas Jokat, Wilfried Eagles, Graeme; 1 Alfred Wegener Institute for Polar and Marine Research Bremerhaven Germany Ruppel, Antonia Stefanie; 2 Federal Institute for Geosciences and Natural Resources Hannover Germany Läufer, Andreas; 2 Federal Institute for Geosciences and Natural Resources Hannover Germany Jokat, Wilfried; 1 Alfred Wegener Institute for Polar and Marine Research Bremerhaven Germany 2021-10-07 https://doi.org/10.1029/2021JF006342 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9774 eng eng doi:10.1029/2021JF006342 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9774 This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY ddc:526.7 ddc:551.343 subglacial bathymetry gravity inversion Roi Baudouin ice shelf stability ice‐ocean interactions Borchgrevink doc-type:article 2021 ftsubggeo https://doi.org/10.1029/2021JF006342 2022-11-09T06:51:42Z The stability of ice shelves and drainage of ice sheets they buttress is largely determined by melting at their atmospheric and oceanic interfaces. Subglacial bathymetry can impact ice shelf stability because it influences the onset and the pattern of warm ocean water incursions into the cavities between them and the seafloor. Bathymetry is further important at pinning points, which significantly retard the flow of ice shelves. This effect can be lost instantaneously if basal and surface melting cause an ice sheet to thin and lift off its pinning points. With all this in mind, we have developed a model of bathymetry beneath the western Roi Baudouin and central and eastern Borchgrevink ice shelves in Dronning Maud Land based on inversion from gravity data and tied to available depth references offshore and subglacial topography inland of the grounding line. The model shows deep glacial troughs beneath the ice shelves and bathymetric sills close to the continental shelf. The central Borchgrevink Ice Shelf overhangs the continental slope by around 50 km, exposing its northern parts to the open ocean and higher ocean temperatures. Continuous troughs traverse the central Borchgrevink and western Roi Baudouin ice shelves at depths greater than the offshore thermocline and thus present a risk of Warm Deep Water intrusions into their cavities under the current and future oceanographic regimes. Differing bathymetric characteristics might explain the ice shelves' contrasting dominant mass loss processes. Plain Language Summary: The rate at which Antarctica's ice sheets flow off the continent is largely stabilized by floating ice shelves that form where they meet the surrounding ocean. Assessing the stability of this interconnected system strongly depends on correctly quantifying ice gain processes, such as snowfall, and ice mass loss processes, such as melting at the bases of the ice shelves. This basal melting strongly depends on the flow of warm ocean water into the cavity between the ice shelf and the seafloor below, ... Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land East Antarctica Ice Sheet Ice Shelf Ice Shelves GEO-LEOe-docs (FID GEO) East Antarctica Dronning Maud Land Buttress ENVELOPE(-57.083,-57.083,-63.550,-63.550) Roi Baudouin ENVELOPE(24.461,24.461,-70.438,-70.438) Borchgrevink ENVELOPE(23.133,23.133,-72.117,-72.117) Journal of Geophysical Research: Earth Surface 126 10 |
institution |
Open Polar |
collection |
GEO-LEOe-docs (FID GEO) |
op_collection_id |
ftsubggeo |
language |
English |
topic |
ddc:526.7 ddc:551.343 subglacial bathymetry gravity inversion Roi Baudouin ice shelf stability ice‐ocean interactions Borchgrevink |
spellingShingle |
ddc:526.7 ddc:551.343 subglacial bathymetry gravity inversion Roi Baudouin ice shelf stability ice‐ocean interactions Borchgrevink Eisermann, Hannes Eagles, Graeme Ruppel, Antonia Stefanie Läufer, Andreas Jokat, Wilfried Eagles, Graeme; 1 Alfred Wegener Institute for Polar and Marine Research Bremerhaven Germany Ruppel, Antonia Stefanie; 2 Federal Institute for Geosciences and Natural Resources Hannover Germany Läufer, Andreas; 2 Federal Institute for Geosciences and Natural Resources Hannover Germany Jokat, Wilfried; 1 Alfred Wegener Institute for Polar and Marine Research Bremerhaven Germany Bathymetric Control on Borchgrevink and Roi Baudouin Ice Shelves in East Antarctica |
topic_facet |
ddc:526.7 ddc:551.343 subglacial bathymetry gravity inversion Roi Baudouin ice shelf stability ice‐ocean interactions Borchgrevink |
description |
The stability of ice shelves and drainage of ice sheets they buttress is largely determined by melting at their atmospheric and oceanic interfaces. Subglacial bathymetry can impact ice shelf stability because it influences the onset and the pattern of warm ocean water incursions into the cavities between them and the seafloor. Bathymetry is further important at pinning points, which significantly retard the flow of ice shelves. This effect can be lost instantaneously if basal and surface melting cause an ice sheet to thin and lift off its pinning points. With all this in mind, we have developed a model of bathymetry beneath the western Roi Baudouin and central and eastern Borchgrevink ice shelves in Dronning Maud Land based on inversion from gravity data and tied to available depth references offshore and subglacial topography inland of the grounding line. The model shows deep glacial troughs beneath the ice shelves and bathymetric sills close to the continental shelf. The central Borchgrevink Ice Shelf overhangs the continental slope by around 50 km, exposing its northern parts to the open ocean and higher ocean temperatures. Continuous troughs traverse the central Borchgrevink and western Roi Baudouin ice shelves at depths greater than the offshore thermocline and thus present a risk of Warm Deep Water intrusions into their cavities under the current and future oceanographic regimes. Differing bathymetric characteristics might explain the ice shelves' contrasting dominant mass loss processes. Plain Language Summary: The rate at which Antarctica's ice sheets flow off the continent is largely stabilized by floating ice shelves that form where they meet the surrounding ocean. Assessing the stability of this interconnected system strongly depends on correctly quantifying ice gain processes, such as snowfall, and ice mass loss processes, such as melting at the bases of the ice shelves. This basal melting strongly depends on the flow of warm ocean water into the cavity between the ice shelf and the seafloor below, ... |
format |
Article in Journal/Newspaper |
author |
Eisermann, Hannes Eagles, Graeme Ruppel, Antonia Stefanie Läufer, Andreas Jokat, Wilfried Eagles, Graeme; 1 Alfred Wegener Institute for Polar and Marine Research Bremerhaven Germany Ruppel, Antonia Stefanie; 2 Federal Institute for Geosciences and Natural Resources Hannover Germany Läufer, Andreas; 2 Federal Institute for Geosciences and Natural Resources Hannover Germany Jokat, Wilfried; 1 Alfred Wegener Institute for Polar and Marine Research Bremerhaven Germany |
author_facet |
Eisermann, Hannes Eagles, Graeme Ruppel, Antonia Stefanie Läufer, Andreas Jokat, Wilfried Eagles, Graeme; 1 Alfred Wegener Institute for Polar and Marine Research Bremerhaven Germany Ruppel, Antonia Stefanie; 2 Federal Institute for Geosciences and Natural Resources Hannover Germany Läufer, Andreas; 2 Federal Institute for Geosciences and Natural Resources Hannover Germany Jokat, Wilfried; 1 Alfred Wegener Institute for Polar and Marine Research Bremerhaven Germany |
author_sort |
Eisermann, Hannes |
title |
Bathymetric Control on Borchgrevink and Roi Baudouin Ice Shelves in East Antarctica |
title_short |
Bathymetric Control on Borchgrevink and Roi Baudouin Ice Shelves in East Antarctica |
title_full |
Bathymetric Control on Borchgrevink and Roi Baudouin Ice Shelves in East Antarctica |
title_fullStr |
Bathymetric Control on Borchgrevink and Roi Baudouin Ice Shelves in East Antarctica |
title_full_unstemmed |
Bathymetric Control on Borchgrevink and Roi Baudouin Ice Shelves in East Antarctica |
title_sort |
bathymetric control on borchgrevink and roi baudouin ice shelves in east antarctica |
publishDate |
2021 |
url |
https://doi.org/10.1029/2021JF006342 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9774 |
long_lat |
ENVELOPE(-57.083,-57.083,-63.550,-63.550) ENVELOPE(24.461,24.461,-70.438,-70.438) ENVELOPE(23.133,23.133,-72.117,-72.117) |
geographic |
East Antarctica Dronning Maud Land Buttress Roi Baudouin Borchgrevink |
geographic_facet |
East Antarctica Dronning Maud Land Buttress Roi Baudouin Borchgrevink |
genre |
Antarc* Antarctica Dronning Maud Land East Antarctica Ice Sheet Ice Shelf Ice Shelves |
genre_facet |
Antarc* Antarctica Dronning Maud Land East Antarctica Ice Sheet Ice Shelf Ice Shelves |
op_relation |
doi:10.1029/2021JF006342 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9774 |
op_rights |
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2021JF006342 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
126 |
container_issue |
10 |
_version_ |
1766168939037982720 |