Evolution of ice-shelf channels in Antarctic ice shelves
Ice shelves buttress the continental ice flux and mediate ice–ocean interactions. They are often traversed by channels in which basal melting is enhanced, impacting ice-shelf stability. Here, channel evolution is investigated using a transient, three-dimensional full Stokes model and geophysical dat...
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ftdoajarticles:oai:doaj.org/article:1cebaeb53a22459b9a141307908c27da 2023-05-15T13:47:42+02:00 Evolution of ice-shelf channels in Antarctic ice shelves R. Drews 2015-06-01T00:00:00Z https://doi.org/10.5194/tc-9-1169-2015 https://doaj.org/article/1cebaeb53a22459b9a141307908c27da EN eng Copernicus Publications http://www.the-cryosphere.net/9/1169/2015/tc-9-1169-2015.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-9-1169-2015 https://doaj.org/article/1cebaeb53a22459b9a141307908c27da The Cryosphere, Vol 9, Iss 3, Pp 1169-1181 (2015) Environmental sciences GE1-350 Geology QE1-996.5 article 2015 ftdoajarticles https://doi.org/10.5194/tc-9-1169-2015 2022-12-31T06:37:28Z Ice shelves buttress the continental ice flux and mediate ice–ocean interactions. They are often traversed by channels in which basal melting is enhanced, impacting ice-shelf stability. Here, channel evolution is investigated using a transient, three-dimensional full Stokes model and geophysical data collected on the Roi Baudouin Ice Shelf (RBIS), Antarctica. The modeling confirms basal melting as a feasible mechanism for channel creation, although channels may also advect without melting for many tens of kilometers. Channels can be out of hydrostatic equilibrium depending on their width and the upstream melt history. Inverting surface elevation for ice thickness using hydrostatic equilibrium in those areas is erroneous, and corresponding observational evidence is presented at RBIS by comparing the hydrostatically inverted ice thickness with radar measurements. The model shows that channelized melting imprints the flow field characteristically, which can result in enhanced horizontal shearing across channels. This is exemplified for a channel at RBIS using observed surface velocities and opens up the possibility to classify channelized melting from space, an important step towards incorporating these effects in ice–ocean models. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Shelf Ice Shelves The Cryosphere Directory of Open Access Journals: DOAJ Articles Antarctic Buttress ENVELOPE(-57.083,-57.083,-63.550,-63.550) Roi Baudouin ENVELOPE(24.461,24.461,-70.438,-70.438) The Cryosphere 9 3 1169 1181 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 R. Drews Evolution of ice-shelf channels in Antarctic ice shelves |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Ice shelves buttress the continental ice flux and mediate ice–ocean interactions. They are often traversed by channels in which basal melting is enhanced, impacting ice-shelf stability. Here, channel evolution is investigated using a transient, three-dimensional full Stokes model and geophysical data collected on the Roi Baudouin Ice Shelf (RBIS), Antarctica. The modeling confirms basal melting as a feasible mechanism for channel creation, although channels may also advect without melting for many tens of kilometers. Channels can be out of hydrostatic equilibrium depending on their width and the upstream melt history. Inverting surface elevation for ice thickness using hydrostatic equilibrium in those areas is erroneous, and corresponding observational evidence is presented at RBIS by comparing the hydrostatically inverted ice thickness with radar measurements. The model shows that channelized melting imprints the flow field characteristically, which can result in enhanced horizontal shearing across channels. This is exemplified for a channel at RBIS using observed surface velocities and opens up the possibility to classify channelized melting from space, an important step towards incorporating these effects in ice–ocean models. |
format |
Article in Journal/Newspaper |
author |
R. Drews |
author_facet |
R. Drews |
author_sort |
R. Drews |
title |
Evolution of ice-shelf channels in Antarctic ice shelves |
title_short |
Evolution of ice-shelf channels in Antarctic ice shelves |
title_full |
Evolution of ice-shelf channels in Antarctic ice shelves |
title_fullStr |
Evolution of ice-shelf channels in Antarctic ice shelves |
title_full_unstemmed |
Evolution of ice-shelf channels in Antarctic ice shelves |
title_sort |
evolution of ice-shelf channels in antarctic ice shelves |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/tc-9-1169-2015 https://doaj.org/article/1cebaeb53a22459b9a141307908c27da |
long_lat |
ENVELOPE(-57.083,-57.083,-63.550,-63.550) ENVELOPE(24.461,24.461,-70.438,-70.438) |
geographic |
Antarctic Buttress Roi Baudouin |
geographic_facet |
Antarctic Buttress Roi Baudouin |
genre |
Antarc* Antarctic Antarctica Ice Shelf Ice Shelves The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf Ice Shelves The Cryosphere |
op_source |
The Cryosphere, Vol 9, Iss 3, Pp 1169-1181 (2015) |
op_relation |
http://www.the-cryosphere.net/9/1169/2015/tc-9-1169-2015.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-9-1169-2015 https://doaj.org/article/1cebaeb53a22459b9a141307908c27da |
op_doi |
https://doi.org/10.5194/tc-9-1169-2015 |
container_title |
The Cryosphere |
container_volume |
9 |
container_issue |
3 |
container_start_page |
1169 |
op_container_end_page |
1181 |
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1766247740727099392 |