Atmospheric and oceanographic signatures in the ice shelf channel morphology of Roi Baudouin ice shelf, East Antarctica, inferred from radar data
Ice shelves around Antarctica can provide back stress for outlet glaciers and control ice sheet mass loss. They often contain narrow bands of thin ice termed ice shelf channels. Ice shelf channel morphology can be interpreted through surface depressions and exhibits junctions and deflections from fl...
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ftvliz:oai:oma.vliz.be:337781 2023-05-15T13:53:33+02:00 Atmospheric and oceanographic signatures in the ice shelf channel morphology of Roi Baudouin ice shelf, East Antarctica, inferred from radar data Drews, R. Schannwell, C. Ehlers, T.A. Gladstone, R. Pattyn, F. Matsuoka, K. 2020 application/pdf https://www.vliz.be/imisdocs/publications/361620.pdf en eng info:eu-repo/semantics/altIdentifier/wos/000555444100019 https://www.vliz.be/imisdocs/publications/361620.pdf info:eu-repo/semantics/openAccess %3Ci%3EJGR%3A+Earth+Surface+125%287%29%3C%2Fi%3E%3A+e2020JF005587.+%3Ca+href%3D%22https%3A%2F%2Fhdl.handle.net%2F10.1029%2F2020JF005587%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fhdl.handle.net%2F10.1029%2F2020JF005587%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 ftvliz 2022-05-01T11:55:10Z Ice shelves around Antarctica can provide back stress for outlet glaciers and control ice sheet mass loss. They often contain narrow bands of thin ice termed ice shelf channels. Ice shelf channel morphology can be interpreted through surface depressions and exhibits junctions and deflections from flowlines. Using ice flow modeling and radar, we investigate ice shelf channels in the Roi Baudouin Ice Shelf. These are aligned obliquely to the prevailing easterly winds. In the shallow radar stratigraphy, syncline and anticline stacks occur beneath the upwind and downwind side, respectively. The structures are horizontally and vertically coherent, except near an ice shelf channel junction where patterns change structurally with depth. Deeper layers truncate near basal incisions. Using ice flow modeling, we show that the stratigraphy is ∼9 times more sensitive to atmospheric variability than to oceanic variability. This is due to the continual adjustment toward flotation. We propose that syncline-anticline pairs in the shallow stratigraphy are caused by preferential snow deposition on the windward side and wind erosion at the downwind side. This drives downwind deflection of ice shelf channels of several meters per year. The depth variable structures indicate formation of an ice shelf channel junction by basal melting. We conclude that many ice shelf channels are seeded at the grounding line. Their morphology farther seaward is shaped on different length scales by ice dynamics, the ocean, and the atmosphere. These processes act on finer (subkilometer) scales than are captured by most ice, atmosphere, and ocean models, yet the dynamics of ice shelf channels may have broader implications for ice shelf stability. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) East Antarctica Roi Baudouin ENVELOPE(24.461,24.461,-70.438,-70.438) |
institution |
Open Polar |
collection |
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
op_collection_id |
ftvliz |
language |
English |
description |
Ice shelves around Antarctica can provide back stress for outlet glaciers and control ice sheet mass loss. They often contain narrow bands of thin ice termed ice shelf channels. Ice shelf channel morphology can be interpreted through surface depressions and exhibits junctions and deflections from flowlines. Using ice flow modeling and radar, we investigate ice shelf channels in the Roi Baudouin Ice Shelf. These are aligned obliquely to the prevailing easterly winds. In the shallow radar stratigraphy, syncline and anticline stacks occur beneath the upwind and downwind side, respectively. The structures are horizontally and vertically coherent, except near an ice shelf channel junction where patterns change structurally with depth. Deeper layers truncate near basal incisions. Using ice flow modeling, we show that the stratigraphy is ∼9 times more sensitive to atmospheric variability than to oceanic variability. This is due to the continual adjustment toward flotation. We propose that syncline-anticline pairs in the shallow stratigraphy are caused by preferential snow deposition on the windward side and wind erosion at the downwind side. This drives downwind deflection of ice shelf channels of several meters per year. The depth variable structures indicate formation of an ice shelf channel junction by basal melting. We conclude that many ice shelf channels are seeded at the grounding line. Their morphology farther seaward is shaped on different length scales by ice dynamics, the ocean, and the atmosphere. These processes act on finer (subkilometer) scales than are captured by most ice, atmosphere, and ocean models, yet the dynamics of ice shelf channels may have broader implications for ice shelf stability. |
format |
Article in Journal/Newspaper |
author |
Drews, R. Schannwell, C. Ehlers, T.A. Gladstone, R. Pattyn, F. Matsuoka, K. |
spellingShingle |
Drews, R. Schannwell, C. Ehlers, T.A. Gladstone, R. Pattyn, F. Matsuoka, K. Atmospheric and oceanographic signatures in the ice shelf channel morphology of Roi Baudouin ice shelf, East Antarctica, inferred from radar data |
author_facet |
Drews, R. Schannwell, C. Ehlers, T.A. Gladstone, R. Pattyn, F. Matsuoka, K. |
author_sort |
Drews, R. |
title |
Atmospheric and oceanographic signatures in the ice shelf channel morphology of Roi Baudouin ice shelf, East Antarctica, inferred from radar data |
title_short |
Atmospheric and oceanographic signatures in the ice shelf channel morphology of Roi Baudouin ice shelf, East Antarctica, inferred from radar data |
title_full |
Atmospheric and oceanographic signatures in the ice shelf channel morphology of Roi Baudouin ice shelf, East Antarctica, inferred from radar data |
title_fullStr |
Atmospheric and oceanographic signatures in the ice shelf channel morphology of Roi Baudouin ice shelf, East Antarctica, inferred from radar data |
title_full_unstemmed |
Atmospheric and oceanographic signatures in the ice shelf channel morphology of Roi Baudouin ice shelf, East Antarctica, inferred from radar data |
title_sort |
atmospheric and oceanographic signatures in the ice shelf channel morphology of roi baudouin ice shelf, east antarctica, inferred from radar data |
publishDate |
2020 |
url |
https://www.vliz.be/imisdocs/publications/361620.pdf |
long_lat |
ENVELOPE(24.461,24.461,-70.438,-70.438) |
geographic |
East Antarctica Roi Baudouin |
geographic_facet |
East Antarctica Roi Baudouin |
genre |
Antarc* Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves |
genre_facet |
Antarc* Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves |
op_source |
%3Ci%3EJGR%3A+Earth+Surface+125%287%29%3C%2Fi%3E%3A+e2020JF005587.+%3Ca+href%3D%22https%3A%2F%2Fhdl.handle.net%2F10.1029%2F2020JF005587%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fhdl.handle.net%2F10.1029%2F2020JF005587%3C%2Fa%3E |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000555444100019 https://www.vliz.be/imisdocs/publications/361620.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766258749411950592 |