Two independent methods for mapping the grounding line of an outlet glacier – an example from the Astrolabe Glacier, Terre Adélie, Antarctica
The grounding line is a key element of coastal outlet glaciers, acting on their dynamics. Accurately knowing its position is fundamental for both modelling the glacier dynamics and establishing a benchmark for later change detection. Here we map the grounding line of the Astrolabe Glacier in East An...
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Language: | English |
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Copernicus Publications
2014
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Online Access: | https://doi.org/10.5194/tc-8-1331-2014 https://doaj.org/article/fc25def9b4dc478b8640cfa6047f9b41 |
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ftdoajarticles:oai:doaj.org/article:fc25def9b4dc478b8640cfa6047f9b41 2023-05-15T13:45:19+02:00 Two independent methods for mapping the grounding line of an outlet glacier – an example from the Astrolabe Glacier, Terre Adélie, Antarctica E. Le Meur M. Sacchettini S. Garambois E. Berthier A. S. Drouet G. Durand D. Young J. S. Greenbaum J. W. Holt D. D. Blankenship E. Rignot J. Mouginot Y. Gim D. Kirchner B. de Fleurian O. Gagliardini F. Gillet-Chaulet 2014-07-01T00:00:00Z https://doi.org/10.5194/tc-8-1331-2014 https://doaj.org/article/fc25def9b4dc478b8640cfa6047f9b41 EN eng Copernicus Publications http://www.the-cryosphere.net/8/1331/2014/tc-8-1331-2014.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-8-1331-2014 https://doaj.org/article/fc25def9b4dc478b8640cfa6047f9b41 The Cryosphere, Vol 8, Iss 4, Pp 1331-1346 (2014) Environmental sciences GE1-350 Geology QE1-996.5 article 2014 ftdoajarticles https://doi.org/10.5194/tc-8-1331-2014 2022-12-31T02:42:24Z The grounding line is a key element of coastal outlet glaciers, acting on their dynamics. Accurately knowing its position is fundamental for both modelling the glacier dynamics and establishing a benchmark for later change detection. Here we map the grounding line of the Astrolabe Glacier in East Antarctica (66°41' S, 140°05' E), using both hydrostatic and tidal methods. The first method is based on new surface and ice thickness data from which the line of buoyant floatation is found. The second method uses kinematic GPS measurements of the tidal response of the ice surface. By detecting the transitions where the ice starts to move vertically in response to the tidal forcing we determine control points for the grounding line position along GPS profiles. Employing a two-dimensional elastic plate model, we compute the rigid short-term behaviour of the ice plate and estimate the correction required to compare the kinematic GPS control points with the previously determined line of floatation. These two approaches show consistency and lead us to propose a grounding line for the Astrolabe Glacier that significantly deviates from the lines obtained so far from satellite imagery. Article in Journal/Newspaper Antarc* Antarctica Astrolabe Glacier East Antarctica The Cryosphere Directory of Open Access Journals: DOAJ Articles East Antarctica Terre Adélie ENVELOPE(139.000,139.000,-67.000,-67.000) Terre-Adélie ENVELOPE(138.991,138.991,-59.999,-59.999) Astrolabe ENVELOPE(140.000,140.000,-66.733,-66.733) Astrolabe Glacier ENVELOPE(139.917,139.917,-66.750,-66.750) The Cryosphere 8 4 1331 1346 |
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 E. Le Meur M. Sacchettini S. Garambois E. Berthier A. S. Drouet G. Durand D. Young J. S. Greenbaum J. W. Holt D. D. Blankenship E. Rignot J. Mouginot Y. Gim D. Kirchner B. de Fleurian O. Gagliardini F. Gillet-Chaulet Two independent methods for mapping the grounding line of an outlet glacier – an example from the Astrolabe Glacier, Terre Adélie, Antarctica |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
The grounding line is a key element of coastal outlet glaciers, acting on their dynamics. Accurately knowing its position is fundamental for both modelling the glacier dynamics and establishing a benchmark for later change detection. Here we map the grounding line of the Astrolabe Glacier in East Antarctica (66°41' S, 140°05' E), using both hydrostatic and tidal methods. The first method is based on new surface and ice thickness data from which the line of buoyant floatation is found. The second method uses kinematic GPS measurements of the tidal response of the ice surface. By detecting the transitions where the ice starts to move vertically in response to the tidal forcing we determine control points for the grounding line position along GPS profiles. Employing a two-dimensional elastic plate model, we compute the rigid short-term behaviour of the ice plate and estimate the correction required to compare the kinematic GPS control points with the previously determined line of floatation. These two approaches show consistency and lead us to propose a grounding line for the Astrolabe Glacier that significantly deviates from the lines obtained so far from satellite imagery. |
format |
Article in Journal/Newspaper |
author |
E. Le Meur M. Sacchettini S. Garambois E. Berthier A. S. Drouet G. Durand D. Young J. S. Greenbaum J. W. Holt D. D. Blankenship E. Rignot J. Mouginot Y. Gim D. Kirchner B. de Fleurian O. Gagliardini F. Gillet-Chaulet |
author_facet |
E. Le Meur M. Sacchettini S. Garambois E. Berthier A. S. Drouet G. Durand D. Young J. S. Greenbaum J. W. Holt D. D. Blankenship E. Rignot J. Mouginot Y. Gim D. Kirchner B. de Fleurian O. Gagliardini F. Gillet-Chaulet |
author_sort |
E. Le Meur |
title |
Two independent methods for mapping the grounding line of an outlet glacier – an example from the Astrolabe Glacier, Terre Adélie, Antarctica |
title_short |
Two independent methods for mapping the grounding line of an outlet glacier – an example from the Astrolabe Glacier, Terre Adélie, Antarctica |
title_full |
Two independent methods for mapping the grounding line of an outlet glacier – an example from the Astrolabe Glacier, Terre Adélie, Antarctica |
title_fullStr |
Two independent methods for mapping the grounding line of an outlet glacier – an example from the Astrolabe Glacier, Terre Adélie, Antarctica |
title_full_unstemmed |
Two independent methods for mapping the grounding line of an outlet glacier – an example from the Astrolabe Glacier, Terre Adélie, Antarctica |
title_sort |
two independent methods for mapping the grounding line of an outlet glacier – an example from the astrolabe glacier, terre adélie, antarctica |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/tc-8-1331-2014 https://doaj.org/article/fc25def9b4dc478b8640cfa6047f9b41 |
long_lat |
ENVELOPE(139.000,139.000,-67.000,-67.000) ENVELOPE(138.991,138.991,-59.999,-59.999) ENVELOPE(140.000,140.000,-66.733,-66.733) ENVELOPE(139.917,139.917,-66.750,-66.750) |
geographic |
East Antarctica Terre Adélie Terre-Adélie Astrolabe Astrolabe Glacier |
geographic_facet |
East Antarctica Terre Adélie Terre-Adélie Astrolabe Astrolabe Glacier |
genre |
Antarc* Antarctica Astrolabe Glacier East Antarctica The Cryosphere |
genre_facet |
Antarc* Antarctica Astrolabe Glacier East Antarctica The Cryosphere |
op_source |
The Cryosphere, Vol 8, Iss 4, Pp 1331-1346 (2014) |
op_relation |
http://www.the-cryosphere.net/8/1331/2014/tc-8-1331-2014.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-8-1331-2014 https://doaj.org/article/fc25def9b4dc478b8640cfa6047f9b41 |
op_doi |
https://doi.org/10.5194/tc-8-1331-2014 |
container_title |
The Cryosphere |
container_volume |
8 |
container_issue |
4 |
container_start_page |
1331 |
op_container_end_page |
1346 |
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1766220554001448960 |