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...
Main Authors: | , , , , , , , , , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
eScholarship, University of California
2014
|
Subjects: | |
Online Access: | https://escholarship.org/uc/item/6t64z4pc |
id |
ftcdlib:oai:escholarship.org:ark:/13030/qt6t64z4pc |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:oai:escholarship.org:ark:/13030/qt6t64z4pc 2023-10-25T01:31:27+02:00 Two independent methods for mapping the grounding line of an outlet glacier – an example from the Astrolabe Glacier, Terre Adélie, Antarctica Le Meur, E Sacchettini, M Garambois, S Berthier, E Drouet, AS Durand, G Young, D Greenbaum, JS Holt, JW Blankenship, DD Rignot, E Mouginot, J Gim, Y Kirchner, D de Fleurian, B Gagliardini, O Gillet-Chaulet, F 1331 - 1346 2014-01-01 application/pdf https://escholarship.org/uc/item/6t64z4pc unknown eScholarship, University of California qt6t64z4pc https://escholarship.org/uc/item/6t64z4pc CC-BY The Cryosphere, vol 8, iss 4 Earth Sciences Physical Geography and Environmental Geoscience Climate Action Oceanography Meteorology & Atmospheric Sciences article 2014 ftcdlib 2023-09-25T18:03:25Z 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. © Author(s) 2014. CC Attribution 3.0 License. Article in Journal/Newspaper Antarc* Antarctica Astrolabe Glacier East Antarctica The Cryosphere University of California: eScholarship Astrolabe ENVELOPE(140.000,140.000,-66.733,-66.733) Astrolabe Glacier ENVELOPE(139.917,139.917,-66.750,-66.750) East Antarctica Terre Adélie ENVELOPE(139.000,139.000,-67.000,-67.000) Terre-Adélie ENVELOPE(138.991,138.991,-59.999,-59.999) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Climate Action Oceanography Meteorology & Atmospheric Sciences |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Climate Action Oceanography Meteorology & Atmospheric Sciences Le Meur, E Sacchettini, M Garambois, S Berthier, E Drouet, AS Durand, G Young, D Greenbaum, JS Holt, JW Blankenship, DD Rignot, E Mouginot, J Gim, Y Kirchner, D de Fleurian, B Gagliardini, O Gillet-Chaulet, F Two independent methods for mapping the grounding line of an outlet glacier – an example from the Astrolabe Glacier, Terre Adélie, Antarctica |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Climate Action Oceanography Meteorology & Atmospheric Sciences |
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. © Author(s) 2014. CC Attribution 3.0 License. |
format |
Article in Journal/Newspaper |
author |
Le Meur, E Sacchettini, M Garambois, S Berthier, E Drouet, AS Durand, G Young, D Greenbaum, JS Holt, JW Blankenship, DD Rignot, E Mouginot, J Gim, Y Kirchner, D de Fleurian, B Gagliardini, O Gillet-Chaulet, F |
author_facet |
Le Meur, E Sacchettini, M Garambois, S Berthier, E Drouet, AS Durand, G Young, D Greenbaum, JS Holt, JW Blankenship, DD Rignot, E Mouginot, J Gim, Y Kirchner, D de Fleurian, B Gagliardini, O Gillet-Chaulet, F |
author_sort |
Le Meur, E |
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 |
eScholarship, University of California |
publishDate |
2014 |
url |
https://escholarship.org/uc/item/6t64z4pc |
op_coverage |
1331 - 1346 |
long_lat |
ENVELOPE(140.000,140.000,-66.733,-66.733) ENVELOPE(139.917,139.917,-66.750,-66.750) ENVELOPE(139.000,139.000,-67.000,-67.000) ENVELOPE(138.991,138.991,-59.999,-59.999) |
geographic |
Astrolabe Astrolabe Glacier East Antarctica Terre Adélie Terre-Adélie |
geographic_facet |
Astrolabe Astrolabe Glacier East Antarctica Terre Adélie Terre-Adélie |
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 |
op_relation |
qt6t64z4pc https://escholarship.org/uc/item/6t64z4pc |
op_rights |
CC-BY |
_version_ |
1780726941673848832 |