Geometry and ice dynamics of the Darwin–Hatherton glacial system, Transantarctic Mountains
The Darwin–Hatherton Glacial system (DHGS) connects the East Antarctic Ice Sheet (EAIS) with the Ross Ice Shelf and is a key area for understanding past variations in ice thickness of surrounding ice masses. Here we present the first detailed measurements of ice thickness and grounding zone characte...
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Cambridge University Press
2017
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Online Access: | http://hdl.handle.net/11250/2591003 https://doi.org/10.1017/jog.2017.60 |
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fthsvestlandet:oai:hvlopen.brage.unit.no:11250/2591003 2024-03-03T08:39:14+00:00 Geometry and ice dynamics of the Darwin–Hatherton glacial system, Transantarctic Mountains Gillespie, Mette Kusk Lawson, Wendy Rack, Wolfgang Anderson, Brian Blankenship, D. D. Young, D. A. Holt, J. W. Antarctica 2017 application/pdf http://hdl.handle.net/11250/2591003 https://doi.org/10.1017/jog.2017.60 eng eng Cambridge University Press Gillespie, M. K., Lawson, W., Rack, W., Anderson, B., Blankenship, D. D., Young, D. A., & Holt, J. W. (2017). Geometry and ice dynamics of the Darwin–Hatherton glacial system, Transantarctic Mountains. Journal of Glaciology, 63(242), 959-972. urn:issn:0022-1430 http://hdl.handle.net/11250/2591003 https://doi.org/10.1017/jog.2017.60 cristin:1549300 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © The Author(s) 2017 959-972 63 Journal of Glaciology 242 Antarctic glaciology glacier flow glacier mass balance ice/ocean interactions ice thickness measurements VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 Journal article Peer reviewed 2017 fthsvestlandet https://doi.org/10.1017/jog.2017.60 2024-02-02T12:40:30Z The Darwin–Hatherton Glacial system (DHGS) connects the East Antarctic Ice Sheet (EAIS) with the Ross Ice Shelf and is a key area for understanding past variations in ice thickness of surrounding ice masses. Here we present the first detailed measurements of ice thickness and grounding zone characteristics of the DHGS as well as new measurements of ice velocity. The results illustrate the changes that occur in glacier geometry and ice flux as ice flows from the polar plateau and into the Ross Ice Shelf. The ice discharge and the mean basal ice shelf melt for the first 8.5 km downstream of the grounding line amount to 0.24 ± 0.05 km3 a−1 and 0.3 ± 0.1 m a−1, respectively. As the ice begins to float, ice thickness decreases rapidly and basal terraces develop. Constructed maps of glacier geometry suggest that ice drainage from the EAIS into the Darwin Glacier occurs primarily through a deep subglacial canyon. By contrast, ice thins to <200 m at the head of the much slower flowing Hatherton Glacier. The glaciological field study establishes an improved basis for the interpretation of glacial drift sheets at the link between the EAIS and the Ross Ice Sheet. publishedVersion Article in Journal/Newspaper Antarc* Antarctic Antarctica Darwin Glacier Hatherton Glacier Ice Sheet Ice Shelf Journal of Glaciology Ross Ice Shelf Høgskulen på Vestlandet: HVL Open Antarctic East Antarctic Ice Sheet Ross Ice Shelf Transantarctic Mountains Polar Plateau ENVELOPE(0.000,0.000,-90.000,-90.000) Darwin Glacier ENVELOPE(159.000,159.000,-79.883,-79.883) Hatherton Glacier ENVELOPE(157.583,157.583,-79.917,-79.917) Journal of Glaciology 63 242 959 972 |
institution |
Open Polar |
collection |
Høgskulen på Vestlandet: HVL Open |
op_collection_id |
fthsvestlandet |
language |
English |
topic |
Antarctic glaciology glacier flow glacier mass balance ice/ocean interactions ice thickness measurements VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 |
spellingShingle |
Antarctic glaciology glacier flow glacier mass balance ice/ocean interactions ice thickness measurements VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 Gillespie, Mette Kusk Lawson, Wendy Rack, Wolfgang Anderson, Brian Blankenship, D. D. Young, D. A. Holt, J. W. Geometry and ice dynamics of the Darwin–Hatherton glacial system, Transantarctic Mountains |
topic_facet |
Antarctic glaciology glacier flow glacier mass balance ice/ocean interactions ice thickness measurements VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 |
description |
The Darwin–Hatherton Glacial system (DHGS) connects the East Antarctic Ice Sheet (EAIS) with the Ross Ice Shelf and is a key area for understanding past variations in ice thickness of surrounding ice masses. Here we present the first detailed measurements of ice thickness and grounding zone characteristics of the DHGS as well as new measurements of ice velocity. The results illustrate the changes that occur in glacier geometry and ice flux as ice flows from the polar plateau and into the Ross Ice Shelf. The ice discharge and the mean basal ice shelf melt for the first 8.5 km downstream of the grounding line amount to 0.24 ± 0.05 km3 a−1 and 0.3 ± 0.1 m a−1, respectively. As the ice begins to float, ice thickness decreases rapidly and basal terraces develop. Constructed maps of glacier geometry suggest that ice drainage from the EAIS into the Darwin Glacier occurs primarily through a deep subglacial canyon. By contrast, ice thins to <200 m at the head of the much slower flowing Hatherton Glacier. The glaciological field study establishes an improved basis for the interpretation of glacial drift sheets at the link between the EAIS and the Ross Ice Sheet. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Gillespie, Mette Kusk Lawson, Wendy Rack, Wolfgang Anderson, Brian Blankenship, D. D. Young, D. A. Holt, J. W. |
author_facet |
Gillespie, Mette Kusk Lawson, Wendy Rack, Wolfgang Anderson, Brian Blankenship, D. D. Young, D. A. Holt, J. W. |
author_sort |
Gillespie, Mette Kusk |
title |
Geometry and ice dynamics of the Darwin–Hatherton glacial system, Transantarctic Mountains |
title_short |
Geometry and ice dynamics of the Darwin–Hatherton glacial system, Transantarctic Mountains |
title_full |
Geometry and ice dynamics of the Darwin–Hatherton glacial system, Transantarctic Mountains |
title_fullStr |
Geometry and ice dynamics of the Darwin–Hatherton glacial system, Transantarctic Mountains |
title_full_unstemmed |
Geometry and ice dynamics of the Darwin–Hatherton glacial system, Transantarctic Mountains |
title_sort |
geometry and ice dynamics of the darwin–hatherton glacial system, transantarctic mountains |
publisher |
Cambridge University Press |
publishDate |
2017 |
url |
http://hdl.handle.net/11250/2591003 https://doi.org/10.1017/jog.2017.60 |
op_coverage |
Antarctica |
long_lat |
ENVELOPE(0.000,0.000,-90.000,-90.000) ENVELOPE(159.000,159.000,-79.883,-79.883) ENVELOPE(157.583,157.583,-79.917,-79.917) |
geographic |
Antarctic East Antarctic Ice Sheet Ross Ice Shelf Transantarctic Mountains Polar Plateau Darwin Glacier Hatherton Glacier |
geographic_facet |
Antarctic East Antarctic Ice Sheet Ross Ice Shelf Transantarctic Mountains Polar Plateau Darwin Glacier Hatherton Glacier |
genre |
Antarc* Antarctic Antarctica Darwin Glacier Hatherton Glacier Ice Sheet Ice Shelf Journal of Glaciology Ross Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica Darwin Glacier Hatherton Glacier Ice Sheet Ice Shelf Journal of Glaciology Ross Ice Shelf |
op_source |
959-972 63 Journal of Glaciology 242 |
op_relation |
Gillespie, M. K., Lawson, W., Rack, W., Anderson, B., Blankenship, D. D., Young, D. A., & Holt, J. W. (2017). Geometry and ice dynamics of the Darwin–Hatherton glacial system, Transantarctic Mountains. Journal of Glaciology, 63(242), 959-972. urn:issn:0022-1430 http://hdl.handle.net/11250/2591003 https://doi.org/10.1017/jog.2017.60 cristin:1549300 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © The Author(s) 2017 |
op_doi |
https://doi.org/10.1017/jog.2017.60 |
container_title |
Journal of Glaciology |
container_volume |
63 |
container_issue |
242 |
container_start_page |
959 |
op_container_end_page |
972 |
_version_ |
1792494658398453760 |