Numerical modelling of geothermal heat flux and ice velocity influencing the thermal conditions of the Priestley Glacier trough (northern Victoria Land, Antarctica)
Deep geothermal contributions can affect the thermal equilibrium of glacial systems, which can induce changes in their thermal state. These changes in thermal state can be influenced by glacier dynamics and by the different ice flow velocities experienced over time, which dictate the static and dyna...
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Online Access: | http://hdl.handle.net/11573/1569344 https://doi.org/10.1016/j.geomorph.2021.107959 |
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ftunivromairis:oai:iris.uniroma1.it:11573/1569344 2024-02-11T09:56:00+01:00 Numerical modelling of geothermal heat flux and ice velocity influencing the thermal conditions of the Priestley Glacier trough (northern Victoria Land, Antarctica) Marmoni, G. M. Martino, S. Salvatore, M. C. Gaeta, M. Perinelli, C. Scarascia Mugnozza, G. Baroni, C. Marmoni, G. M. Martino, S. Salvatore, M. C. Gaeta, M. Perinelli, C. Scarascia Mugnozza, G. Baroni, C. 2021 http://hdl.handle.net/11573/1569344 https://doi.org/10.1016/j.geomorph.2021.107959 eng eng Elsevier place:Amsterdam info:eu-repo/semantics/altIdentifier/wos/WOS:000703677700004 volume:394 firstpage:1 lastpage:17 numberofpages:17 journal:GEOMORPHOLOGY http://hdl.handle.net/11573/1569344 doi:10.1016/j.geomorph.2021.107959 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85115779691 info:eu-repo/semantics/closedAccess valley thermal state geothermal flux ice velocity thermal modelling Priestley glacier Antarctica info:eu-repo/semantics/article 2021 ftunivromairis https://doi.org/10.1016/j.geomorph.2021.107959 2024-01-17T18:09:20Z Deep geothermal contributions can affect the thermal equilibrium of glacial systems, which can induce changes in their thermal state. These changes in thermal state can be influenced by glacier dynamics and by the different ice flow velocities experienced over time, which dictate the static and dynamic interactions with glacial trough bedrock. To assess these interactions and to weight the effects of ice mass thermalisations on bedrock, 2D multistage numerical modelling was performed for Priestley Glacier (an outlet glacier) in the East Antarctic glacial system (northern Victoria Land), which has experienced extreme heat flux variations related to rifting and late Cenozoic volcanism. The thermal evolution of Priestley Glacier over the last ~500 ka was modelled considering the mutual contributions of local and deep thermal sources through a parametric variation in the geothermal heat flux. The ice mass velocity was indirectly taken into account by assuming an ice persistence time over the bedrock under timelled considering the mutual contributions of local and deep thermal sources through a parametric variation in the geothermal heat flux. The ice mass velocity was indirectly taken into account by assuming an ice persistence time over the bedrock under time-dependent modelling conditions. Ice thickness and geothermal heat fluxes, varying from 50 to 120 mW/m2, were co conditions are strongly linked in determining the thermal state of the glacier base and consequently its impact on basal erosion. According to the adopted ice stationing levels, heat flux conditions not exceeding 70 mW/m2 are needed for preserving a dry-based glacier only assuming velocity conditions equal to or lower than those observed to date along Priestley Glacier. Assuming increased velocity conditions, the glacier sensitivity to heat fluxes decreases, and high to very high heat fluxes are not sufficient to cause glacier base transitions to wet states. Article in Journal/Newspaper Antarc* Antarctic Antarctica Priestley Glacier Victoria Land Sapienza Università di Roma: CINECA IRIS Antarctic Priestley ENVELOPE(161.883,161.883,-75.183,-75.183) Priestley Glacier ENVELOPE(163.367,163.367,-74.333,-74.333) Victoria Land Geomorphology 394 107959 |
institution |
Open Polar |
collection |
Sapienza Università di Roma: CINECA IRIS |
op_collection_id |
ftunivromairis |
language |
English |
topic |
valley thermal state geothermal flux ice velocity thermal modelling Priestley glacier Antarctica |
spellingShingle |
valley thermal state geothermal flux ice velocity thermal modelling Priestley glacier Antarctica Marmoni, G. M. Martino, S. Salvatore, M. C. Gaeta, M. Perinelli, C. Scarascia Mugnozza, G. Baroni, C. Numerical modelling of geothermal heat flux and ice velocity influencing the thermal conditions of the Priestley Glacier trough (northern Victoria Land, Antarctica) |
topic_facet |
valley thermal state geothermal flux ice velocity thermal modelling Priestley glacier Antarctica |
description |
Deep geothermal contributions can affect the thermal equilibrium of glacial systems, which can induce changes in their thermal state. These changes in thermal state can be influenced by glacier dynamics and by the different ice flow velocities experienced over time, which dictate the static and dynamic interactions with glacial trough bedrock. To assess these interactions and to weight the effects of ice mass thermalisations on bedrock, 2D multistage numerical modelling was performed for Priestley Glacier (an outlet glacier) in the East Antarctic glacial system (northern Victoria Land), which has experienced extreme heat flux variations related to rifting and late Cenozoic volcanism. The thermal evolution of Priestley Glacier over the last ~500 ka was modelled considering the mutual contributions of local and deep thermal sources through a parametric variation in the geothermal heat flux. The ice mass velocity was indirectly taken into account by assuming an ice persistence time over the bedrock under timelled considering the mutual contributions of local and deep thermal sources through a parametric variation in the geothermal heat flux. The ice mass velocity was indirectly taken into account by assuming an ice persistence time over the bedrock under time-dependent modelling conditions. Ice thickness and geothermal heat fluxes, varying from 50 to 120 mW/m2, were co conditions are strongly linked in determining the thermal state of the glacier base and consequently its impact on basal erosion. According to the adopted ice stationing levels, heat flux conditions not exceeding 70 mW/m2 are needed for preserving a dry-based glacier only assuming velocity conditions equal to or lower than those observed to date along Priestley Glacier. Assuming increased velocity conditions, the glacier sensitivity to heat fluxes decreases, and high to very high heat fluxes are not sufficient to cause glacier base transitions to wet states. |
author2 |
Marmoni, G. M. Martino, S. Salvatore, M. C. Gaeta, M. Perinelli, C. Scarascia Mugnozza, G. Baroni, C. |
format |
Article in Journal/Newspaper |
author |
Marmoni, G. M. Martino, S. Salvatore, M. C. Gaeta, M. Perinelli, C. Scarascia Mugnozza, G. Baroni, C. |
author_facet |
Marmoni, G. M. Martino, S. Salvatore, M. C. Gaeta, M. Perinelli, C. Scarascia Mugnozza, G. Baroni, C. |
author_sort |
Marmoni, G. M. |
title |
Numerical modelling of geothermal heat flux and ice velocity influencing the thermal conditions of the Priestley Glacier trough (northern Victoria Land, Antarctica) |
title_short |
Numerical modelling of geothermal heat flux and ice velocity influencing the thermal conditions of the Priestley Glacier trough (northern Victoria Land, Antarctica) |
title_full |
Numerical modelling of geothermal heat flux and ice velocity influencing the thermal conditions of the Priestley Glacier trough (northern Victoria Land, Antarctica) |
title_fullStr |
Numerical modelling of geothermal heat flux and ice velocity influencing the thermal conditions of the Priestley Glacier trough (northern Victoria Land, Antarctica) |
title_full_unstemmed |
Numerical modelling of geothermal heat flux and ice velocity influencing the thermal conditions of the Priestley Glacier trough (northern Victoria Land, Antarctica) |
title_sort |
numerical modelling of geothermal heat flux and ice velocity influencing the thermal conditions of the priestley glacier trough (northern victoria land, antarctica) |
publisher |
Elsevier |
publishDate |
2021 |
url |
http://hdl.handle.net/11573/1569344 https://doi.org/10.1016/j.geomorph.2021.107959 |
long_lat |
ENVELOPE(161.883,161.883,-75.183,-75.183) ENVELOPE(163.367,163.367,-74.333,-74.333) |
geographic |
Antarctic Priestley Priestley Glacier Victoria Land |
geographic_facet |
Antarctic Priestley Priestley Glacier Victoria Land |
genre |
Antarc* Antarctic Antarctica Priestley Glacier Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica Priestley Glacier Victoria Land |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000703677700004 volume:394 firstpage:1 lastpage:17 numberofpages:17 journal:GEOMORPHOLOGY http://hdl.handle.net/11573/1569344 doi:10.1016/j.geomorph.2021.107959 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85115779691 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.geomorph.2021.107959 |
container_title |
Geomorphology |
container_volume |
394 |
container_start_page |
107959 |
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1790600047611609088 |