Sensitivity of the Lambert-Amery glacial system to geothermal heat flux
Geothermal heat flux (GHF) is one of the key thermal boundary conditions for ice-sheet models. We assess the sensitivity of the Lambert-Amery glacial system in East Antarctica to four different GHF datasets using a regional ice-sheet model. A control solution of the regional model is initialised by...
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Online Access: | https://doi.org/10.1017/aog.2016.26 http://ecite.utas.edu.au/114791 |
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ftunivtasecite:oai:ecite.utas.edu.au:114791 2023-05-15T13:29:43+02:00 Sensitivity of the Lambert-Amery glacial system to geothermal heat flux Pittard, ML Roberts, JL Galton-Fenzi, BK Watson, CS 2016 application/pdf https://doi.org/10.1017/aog.2016.26 http://ecite.utas.edu.au/114791 en eng Int Glaciol Soc http://ecite.utas.edu.au/114791/1/114791 final.pdf http://dx.doi.org/10.1017/aog.2016.26 Pittard, ML and Roberts, JL and Galton-Fenzi, BK and Watson, CS, Sensitivity of the Lambert-Amery glacial system to geothermal heat flux, Annals of Glaciology, 57, (73) pp. 56-68. ISSN 0260-3055 (2016) [Refereed Article] http://ecite.utas.edu.au/114791 Earth Sciences Physical Geography and Environmental Geoscience Glaciology Refereed Article PeerReviewed 2016 ftunivtasecite https://doi.org/10.1017/aog.2016.26 2019-12-13T22:14:37Z Geothermal heat flux (GHF) is one of the key thermal boundary conditions for ice-sheet models. We assess the sensitivity of the Lambert-Amery glacial system in East Antarctica to four different GHF datasets using a regional ice-sheet model. A control solution of the regional model is initialised by minimising the misfit to observations through an optimisation process. The Lambert-Amery glacial system simulation contains temperate ice up to 150 m thick and has an average basal melt of 1.3 mm a −1 , with maximum basal melting of 504 mm a −1 . The simulations which use a relatively high GHF compared to the control solution increase the volume and area of temperate ice, which causes higher surface velocities at higher elevations, which leads to the advance of the grounding line. The grounding line advance leads to changes in the local flow configuration, which dominates the changes within the glacial system. To investigate the difference in spatial patterns within the geothermal datasets, they were scaled to have the same median value. These scaled GHF simulations showed that the ice flow was most sensitive to the spatial variation in the underlying GHF near the ice divides and on the edges of the ice streams. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctica East Antarctica Ice Sheet eCite UTAS (University of Tasmania) Amery ENVELOPE(-94.063,-94.063,56.565,56.565) East Antarctica Annals of Glaciology 57 73 56 68 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology Pittard, ML Roberts, JL Galton-Fenzi, BK Watson, CS Sensitivity of the Lambert-Amery glacial system to geothermal heat flux |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
description |
Geothermal heat flux (GHF) is one of the key thermal boundary conditions for ice-sheet models. We assess the sensitivity of the Lambert-Amery glacial system in East Antarctica to four different GHF datasets using a regional ice-sheet model. A control solution of the regional model is initialised by minimising the misfit to observations through an optimisation process. The Lambert-Amery glacial system simulation contains temperate ice up to 150 m thick and has an average basal melt of 1.3 mm a −1 , with maximum basal melting of 504 mm a −1 . The simulations which use a relatively high GHF compared to the control solution increase the volume and area of temperate ice, which causes higher surface velocities at higher elevations, which leads to the advance of the grounding line. The grounding line advance leads to changes in the local flow configuration, which dominates the changes within the glacial system. To investigate the difference in spatial patterns within the geothermal datasets, they were scaled to have the same median value. These scaled GHF simulations showed that the ice flow was most sensitive to the spatial variation in the underlying GHF near the ice divides and on the edges of the ice streams. |
format |
Article in Journal/Newspaper |
author |
Pittard, ML Roberts, JL Galton-Fenzi, BK Watson, CS |
author_facet |
Pittard, ML Roberts, JL Galton-Fenzi, BK Watson, CS |
author_sort |
Pittard, ML |
title |
Sensitivity of the Lambert-Amery glacial system to geothermal heat flux |
title_short |
Sensitivity of the Lambert-Amery glacial system to geothermal heat flux |
title_full |
Sensitivity of the Lambert-Amery glacial system to geothermal heat flux |
title_fullStr |
Sensitivity of the Lambert-Amery glacial system to geothermal heat flux |
title_full_unstemmed |
Sensitivity of the Lambert-Amery glacial system to geothermal heat flux |
title_sort |
sensitivity of the lambert-amery glacial system to geothermal heat flux |
publisher |
Int Glaciol Soc |
publishDate |
2016 |
url |
https://doi.org/10.1017/aog.2016.26 http://ecite.utas.edu.au/114791 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) |
geographic |
Amery East Antarctica |
geographic_facet |
Amery East Antarctica |
genre |
Annals of Glaciology Antarc* Antarctica East Antarctica Ice Sheet |
genre_facet |
Annals of Glaciology Antarc* Antarctica East Antarctica Ice Sheet |
op_relation |
http://ecite.utas.edu.au/114791/1/114791 final.pdf http://dx.doi.org/10.1017/aog.2016.26 Pittard, ML and Roberts, JL and Galton-Fenzi, BK and Watson, CS, Sensitivity of the Lambert-Amery glacial system to geothermal heat flux, Annals of Glaciology, 57, (73) pp. 56-68. ISSN 0260-3055 (2016) [Refereed Article] http://ecite.utas.edu.au/114791 |
op_doi |
https://doi.org/10.1017/aog.2016.26 |
container_title |
Annals of Glaciology |
container_volume |
57 |
container_issue |
73 |
container_start_page |
56 |
op_container_end_page |
68 |
_version_ |
1766002385475338240 |