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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Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2012
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Online Access: | https://hdl.handle.net/1983/ec278bf6-949a-441d-be03-007ac7e5611b https://research-information.bris.ac.uk/en/publications/ec278bf6-949a-441d-be03-007ac7e5611b https://doi.org/10.1029/2011JF002154 http://homepages.ulb.ac.be/~fpattyn/papers/Pattyn2012_JGR.pdf |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/ec278bf6-949a-441d-be03-007ac7e5611b 2024-01-28T09:59:51+01:00 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, D. Hubbard, B. Samyn, D. Tison, J. L. 2012-10-11 https://hdl.handle.net/1983/ec278bf6-949a-441d-be03-007ac7e5611b https://research-information.bris.ac.uk/en/publications/ec278bf6-949a-441d-be03-007ac7e5611b https://doi.org/10.1029/2011JF002154 http://homepages.ulb.ac.be/~fpattyn/papers/Pattyn2012_JGR.pdf eng eng info:eu-repo/semantics/restrictedAccess Pattyn , F , Matsuoka , K , Callens , D , Conway , H , Depoorter , M , Docquier , D , Hubbard , B , Samyn , D & Tison , J L 2012 , ' Melting and refreezing beneath Roi Baudouin Ice Shelf (East Antarctica) inferred from radar, GPS, and ice core data ' , Journal of Geophysical Research: Earth Surface , vol. 117 , 04008 . https://doi.org/10.1029/2011JF002154 AUTONOMOUS UNDERWATER VEHICLE PHASE-SENSITIVE RADAR PINE ISLAND GLACIER MARINE-ICE WEST ANTARCTICA GROUNDING-LINE FRAZIL ICE SHEET MODEL FLOW article 2012 ftubristolcris https://doi.org/10.1029/2011JF002154 2024-01-04T23:40:32Z 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 Sheet Ice Shelf Ice Shelves Pine Island Pine Island Glacier West Antarctica University of Bristol: Bristol Research Antarctic Dronning Maud Land East Antarctica Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) Roi Baudouin ENVELOPE(24.461,24.461,-70.438,-70.438) West Antarctica Journal of Geophysical Research: Earth Surface 117 F4 n/a n/a |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
topic |
AUTONOMOUS UNDERWATER VEHICLE PHASE-SENSITIVE RADAR PINE ISLAND GLACIER MARINE-ICE WEST ANTARCTICA GROUNDING-LINE FRAZIL ICE SHEET MODEL FLOW |
spellingShingle |
AUTONOMOUS UNDERWATER VEHICLE PHASE-SENSITIVE RADAR PINE ISLAND GLACIER MARINE-ICE WEST ANTARCTICA GROUNDING-LINE FRAZIL ICE SHEET MODEL FLOW Pattyn, F. Matsuoka, K. Callens, D. Conway, H. Depoorter, M. Docquier, D. 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 |
AUTONOMOUS UNDERWATER VEHICLE PHASE-SENSITIVE RADAR PINE ISLAND GLACIER MARINE-ICE WEST ANTARCTICA GROUNDING-LINE FRAZIL ICE SHEET MODEL FLOW |
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. |
format |
Article in Journal/Newspaper |
author |
Pattyn, F. Matsuoka, K. Callens, D. Conway, H. Depoorter, M. Docquier, D. Hubbard, B. Samyn, D. Tison, J. L. |
author_facet |
Pattyn, F. Matsuoka, K. Callens, D. Conway, H. Depoorter, M. Docquier, D. 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 |
publishDate |
2012 |
url |
https://hdl.handle.net/1983/ec278bf6-949a-441d-be03-007ac7e5611b https://research-information.bris.ac.uk/en/publications/ec278bf6-949a-441d-be03-007ac7e5611b https://doi.org/10.1029/2011JF002154 http://homepages.ulb.ac.be/~fpattyn/papers/Pattyn2012_JGR.pdf |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) ENVELOPE(24.461,24.461,-70.438,-70.438) |
geographic |
Antarctic Dronning Maud Land East Antarctica Pine Island Glacier Roi Baudouin West Antarctica |
geographic_facet |
Antarctic Dronning Maud Land East Antarctica Pine Island Glacier Roi Baudouin West Antarctica |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica ice core Ice Sheet Ice Shelf Ice Shelves Pine Island Pine Island Glacier West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica ice core Ice Sheet Ice Shelf Ice Shelves Pine Island Pine Island Glacier West Antarctica |
op_source |
Pattyn , F , Matsuoka , K , Callens , D , Conway , H , Depoorter , M , Docquier , D , Hubbard , B , Samyn , D & Tison , J L 2012 , ' Melting and refreezing beneath Roi Baudouin Ice Shelf (East Antarctica) inferred from radar, GPS, and ice core data ' , Journal of Geophysical Research: Earth Surface , vol. 117 , 04008 . https://doi.org/10.1029/2011JF002154 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
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_ |
1789339735326457856 |