Recent ice dynamic and surface mass balance of Union Glacier in theWest Antarctic Ice Sheet
Here we present the results of a comprehensive glaciological investigation of Union Glacier (79°460 S/83°240 W) in theWest Antarctic Ice Sheet (WAIS), a major outlet glacier within the Ellsworth Mountains. Union Glacier flows into the Ronne Ice Shelf, where recent models have indicated the potential...
Published in: | The Cryosphere |
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Language: | English |
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2014
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Online Access: | https://doi.org/10.5194/tc-8-1445-2014 https://repositorio.uchile.cl/handle/2250/130707 |
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ftunivchile:oai:repositorio.uchile.cl:2250/130707 2023-05-15T13:41:41+02:00 Recent ice dynamic and surface mass balance of Union Glacier in theWest Antarctic Ice Sheet Rivera Ibáñez, Sergio Zamora, Rodrigo Uribe, José A. Jaña, R. Oberreuter, Jonathan 2014 application/pdf https://doi.org/10.5194/tc-8-1445-2014 https://repositorio.uchile.cl/handle/2250/130707 en eng Copernicus Publications The Cryosphere, 8, 1445–1456, 2014 doi:10.5194/tc-8-1445-2014 https://repositorio.uchile.cl/handle/2250/130707 Atribución-NoComercial-SinDerivadas 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ CC-BY-NC-ND Artículo de revista 2014 ftunivchile https://doi.org/10.5194/tc-8-1445-2014 2023-01-29T00:50:46Z Here we present the results of a comprehensive glaciological investigation of Union Glacier (79°460 S/83°240 W) in theWest Antarctic Ice Sheet (WAIS), a major outlet glacier within the Ellsworth Mountains. Union Glacier flows into the Ronne Ice Shelf, where recent models have indicated the potential for significant grounding line zone (GLZ) migrations in response to changing climate and ocean conditions. To elaborate a glaciological base line that can help to evaluate the potential impact of this GLZ change scenario, we installed an array of stakes on Union Glacier in 2007. The stake network has been surveyed repeatedly for elevation, velocity, and net surface mass balance. The region of the stake measurements is in near-equilibrium, and ice speeds are 10 to 33ma−1. Ground-penetrating radars (GPR) have been used to map the subglacial topography, internal structure, and crevasse frequency and depth along surveyed tracks in the stake site area. The bedrock in this area has a minimum elevation of −858ma.s.l., significantly deeper than shown by BEDMAP2 data. However, between this deeper area and the local GLZ, there is a threshold where the subglacial topography shows a maximum altitude of 190 m. This subglacial condition implies that an upstream migration of the GLZ will not have strong effects on Union Glacier until it passes beyond this shallow ice pinning point. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Ice Shelf Ronne Ice Shelf The Cryosphere Union Glacier Universidad de Chile: Repositorio académico Antarctic Ellsworth Mountains ENVELOPE(-85.000,-85.000,-78.750,-78.750) Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Union Glacier ENVELOPE(-82.500,-82.500,-79.750,-79.750) The Cryosphere 8 4 1445 1456 |
institution |
Open Polar |
collection |
Universidad de Chile: Repositorio académico |
op_collection_id |
ftunivchile |
language |
English |
description |
Here we present the results of a comprehensive glaciological investigation of Union Glacier (79°460 S/83°240 W) in theWest Antarctic Ice Sheet (WAIS), a major outlet glacier within the Ellsworth Mountains. Union Glacier flows into the Ronne Ice Shelf, where recent models have indicated the potential for significant grounding line zone (GLZ) migrations in response to changing climate and ocean conditions. To elaborate a glaciological base line that can help to evaluate the potential impact of this GLZ change scenario, we installed an array of stakes on Union Glacier in 2007. The stake network has been surveyed repeatedly for elevation, velocity, and net surface mass balance. The region of the stake measurements is in near-equilibrium, and ice speeds are 10 to 33ma−1. Ground-penetrating radars (GPR) have been used to map the subglacial topography, internal structure, and crevasse frequency and depth along surveyed tracks in the stake site area. The bedrock in this area has a minimum elevation of −858ma.s.l., significantly deeper than shown by BEDMAP2 data. However, between this deeper area and the local GLZ, there is a threshold where the subglacial topography shows a maximum altitude of 190 m. This subglacial condition implies that an upstream migration of the GLZ will not have strong effects on Union Glacier until it passes beyond this shallow ice pinning point. |
format |
Article in Journal/Newspaper |
author |
Rivera Ibáñez, Sergio Zamora, Rodrigo Uribe, José A. Jaña, R. Oberreuter, Jonathan |
spellingShingle |
Rivera Ibáñez, Sergio Zamora, Rodrigo Uribe, José A. Jaña, R. Oberreuter, Jonathan Recent ice dynamic and surface mass balance of Union Glacier in theWest Antarctic Ice Sheet |
author_facet |
Rivera Ibáñez, Sergio Zamora, Rodrigo Uribe, José A. Jaña, R. Oberreuter, Jonathan |
author_sort |
Rivera Ibáñez, Sergio |
title |
Recent ice dynamic and surface mass balance of Union Glacier in theWest Antarctic Ice Sheet |
title_short |
Recent ice dynamic and surface mass balance of Union Glacier in theWest Antarctic Ice Sheet |
title_full |
Recent ice dynamic and surface mass balance of Union Glacier in theWest Antarctic Ice Sheet |
title_fullStr |
Recent ice dynamic and surface mass balance of Union Glacier in theWest Antarctic Ice Sheet |
title_full_unstemmed |
Recent ice dynamic and surface mass balance of Union Glacier in theWest Antarctic Ice Sheet |
title_sort |
recent ice dynamic and surface mass balance of union glacier in thewest antarctic ice sheet |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/tc-8-1445-2014 https://repositorio.uchile.cl/handle/2250/130707 |
long_lat |
ENVELOPE(-85.000,-85.000,-78.750,-78.750) ENVELOPE(-61.000,-61.000,-78.500,-78.500) ENVELOPE(-82.500,-82.500,-79.750,-79.750) |
geographic |
Antarctic Ellsworth Mountains Ronne Ice Shelf Union Glacier |
geographic_facet |
Antarctic Ellsworth Mountains Ronne Ice Shelf Union Glacier |
genre |
Antarc* Antarctic Ice Sheet Ice Shelf Ronne Ice Shelf The Cryosphere Union Glacier |
genre_facet |
Antarc* Antarctic Ice Sheet Ice Shelf Ronne Ice Shelf The Cryosphere Union Glacier |
op_relation |
The Cryosphere, 8, 1445–1456, 2014 doi:10.5194/tc-8-1445-2014 https://repositorio.uchile.cl/handle/2250/130707 |
op_rights |
Atribución-NoComercial-SinDerivadas 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.5194/tc-8-1445-2014 |
container_title |
The Cryosphere |
container_volume |
8 |
container_issue |
4 |
container_start_page |
1445 |
op_container_end_page |
1456 |
_version_ |
1766153848868569088 |