Melting and refreezing beneath Roi Baudouin Ice Shelf (East Antarctica) inferred from radar, GPS, and ice core data
Ice-penetrating radar profiles across the grounding line of a small ice-rise promontory located within the Roi Baudouin Ice Shelf in the Dronning Maud Land sector of East Antarctica show downward dipping englacial radar-detected reflectors. Model results indicate that this reflector pattern is best...
Published in: | Journal of Geophysical Research: Earth Surface |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Wiley-Blackwell Publishing, Inc.
2012
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Online Access: | http://hdl.handle.net/2078/167217 https://doi.org/10.1029/2011JF002154 |
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ftunistlouisbrus:oai:dial.uclouvain.be:boreal:167217 2024-05-12T07:55:25+00:00 Melting and refreezing beneath Roi Baudouin Ice Shelf (East Antarctica) inferred from radar, GPS, and ice core data Pattyn, F. Matsuoka, K. Callens, D. Conway, H. Depoorter, M. Docquier, David Hubbard, B. Samyn, D. Tison, J. L. Université Libre de Bruxelles - Laboratoire de Glaciologie Norwegian Polar Institute - Norwegian Polar Institute University of Washington - Department of Earth and Space Sciences Institute of Geography and Earth Sciences - Centre for Glaciology University of Uppsala - Glaciology Research Group UCL - SST/ELI/ELIC - Earth & Climate 2012 http://hdl.handle.net/2078/167217 https://doi.org/10.1029/2011JF002154 eng eng Wiley-Blackwell Publishing, Inc. boreal:167217 http://hdl.handle.net/2078/167217 doi:10.1029/2011JF002154 urn:ISSN:0148-0227 urn:EISSN:2156-2202 info:eu-repo/semantics/openAccess Journal of Geophysical Research, Vol. 117, no.F4, p. F04008 (2012) grounding line Dronning Maud Land radar ice core info:eu-repo/semantics/article 2012 ftunistlouisbrus https://doi.org/10.1029/2011JF002154 2024-04-18T17:45:26Z Ice-penetrating radar profiles across the grounding line of a small ice-rise promontory located within the Roi Baudouin Ice Shelf in the Dronning Maud Land sector of East Antarctica show downward dipping englacial radar-detected reflectors. Model results indicate that this reflector pattern is best fit by including basal melting of at least 15 cm a-1. This rate of melting is low compared with rates observed on larger ice shelves in both West and East Antarctica. Ice cores extracted from a rift system close to the ice-rise promontory show several meters of marine ice accreted beneath the shelf. These observations of low rates of basal melting, and limited distribution of accreted marine ice suggest that either Antarctic surface water may reach the ice shelf base or that circulation beneath the shelf is likely dominated by the production of high salinity shelf water rather than the incursion of circumpolar deep water, implying a weak sub-shelf circulation system here. Many of the ice shelves located along the coast of Dronning Maud Land are, like Roi Baudouin Ice Shelf, characterized by frequent ice rises and promontories. Therefore, it is highly likely that these are also of shallow bathymetry and are subject to similarly weak side-shelf basal melting and refreezing. Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica ice core Ice Shelf Ice Shelves DIAL@USL-B (Université Saint-Louis, Bruxelles) Antarctic Dronning Maud Land East Antarctica Roi Baudouin ENVELOPE(24.461,24.461,-70.438,-70.438) Journal of Geophysical Research: Earth Surface 117 F4 n/a n/a |
institution |
Open Polar |
collection |
DIAL@USL-B (Université Saint-Louis, Bruxelles) |
op_collection_id |
ftunistlouisbrus |
language |
English |
topic |
grounding line Dronning Maud Land radar ice core |
spellingShingle |
grounding line Dronning Maud Land radar ice core Pattyn, F. Matsuoka, K. Callens, D. Conway, H. Depoorter, M. Docquier, David Hubbard, B. Samyn, D. Tison, J. L. Melting and refreezing beneath Roi Baudouin Ice Shelf (East Antarctica) inferred from radar, GPS, and ice core data |
topic_facet |
grounding line Dronning Maud Land radar ice core |
description |
Ice-penetrating radar profiles across the grounding line of a small ice-rise promontory located within the Roi Baudouin Ice Shelf in the Dronning Maud Land sector of East Antarctica show downward dipping englacial radar-detected reflectors. Model results indicate that this reflector pattern is best fit by including basal melting of at least 15 cm a-1. This rate of melting is low compared with rates observed on larger ice shelves in both West and East Antarctica. Ice cores extracted from a rift system close to the ice-rise promontory show several meters of marine ice accreted beneath the shelf. These observations of low rates of basal melting, and limited distribution of accreted marine ice suggest that either Antarctic surface water may reach the ice shelf base or that circulation beneath the shelf is likely dominated by the production of high salinity shelf water rather than the incursion of circumpolar deep water, implying a weak sub-shelf circulation system here. Many of the ice shelves located along the coast of Dronning Maud Land are, like Roi Baudouin Ice Shelf, characterized by frequent ice rises and promontories. Therefore, it is highly likely that these are also of shallow bathymetry and are subject to similarly weak side-shelf basal melting and refreezing. |
author2 |
Université Libre de Bruxelles - Laboratoire de Glaciologie Norwegian Polar Institute - Norwegian Polar Institute University of Washington - Department of Earth and Space Sciences Institute of Geography and Earth Sciences - Centre for Glaciology University of Uppsala - Glaciology Research Group UCL - SST/ELI/ELIC - Earth & Climate |
format |
Article in Journal/Newspaper |
author |
Pattyn, F. Matsuoka, K. Callens, D. Conway, H. Depoorter, M. Docquier, David Hubbard, B. Samyn, D. Tison, J. L. |
author_facet |
Pattyn, F. Matsuoka, K. Callens, D. Conway, H. Depoorter, M. Docquier, David Hubbard, B. Samyn, D. Tison, J. L. |
author_sort |
Pattyn, F. |
title |
Melting and refreezing beneath Roi Baudouin Ice Shelf (East Antarctica) inferred from radar, GPS, and ice core data |
title_short |
Melting and refreezing beneath Roi Baudouin Ice Shelf (East Antarctica) inferred from radar, GPS, and ice core data |
title_full |
Melting and refreezing beneath Roi Baudouin Ice Shelf (East Antarctica) inferred from radar, GPS, and ice core data |
title_fullStr |
Melting and refreezing beneath Roi Baudouin Ice Shelf (East Antarctica) inferred from radar, GPS, and ice core data |
title_full_unstemmed |
Melting and refreezing beneath Roi Baudouin Ice Shelf (East Antarctica) inferred from radar, GPS, and ice core data |
title_sort |
melting and refreezing beneath roi baudouin ice shelf (east antarctica) inferred from radar, gps, and ice core data |
publisher |
Wiley-Blackwell Publishing, Inc. |
publishDate |
2012 |
url |
http://hdl.handle.net/2078/167217 https://doi.org/10.1029/2011JF002154 |
long_lat |
ENVELOPE(24.461,24.461,-70.438,-70.438) |
geographic |
Antarctic Dronning Maud Land East Antarctica Roi Baudouin |
geographic_facet |
Antarctic Dronning Maud Land East Antarctica Roi Baudouin |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica ice core Ice Shelf Ice Shelves |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica ice core Ice Shelf Ice Shelves |
op_source |
Journal of Geophysical Research, Vol. 117, no.F4, p. F04008 (2012) |
op_relation |
boreal:167217 http://hdl.handle.net/2078/167217 doi:10.1029/2011JF002154 urn:ISSN:0148-0227 urn:EISSN:2156-2202 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2011JF002154 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
117 |
container_issue |
F4 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1798835198488477696 |