Geothermal heat flux derived from airborne magnetic grids and measured temperature gradients in the Amundsen Sea sector of West Antarctica
The West Antarctic Rift System is one of the least understood rift systems on earth, but displays a unique coupled relationship between tectonic processes and ice sheet dynamics. Geothermal heat flux is a poorly constrained parameter in Antarctica and suspected to affect basal conditions of ice shee...
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ftawi:oai:epic.awi.de:46043 2023-05-15T13:23:40+02:00 Geothermal heat flux derived from airborne magnetic grids and measured temperature gradients in the Amundsen Sea sector of West Antarctica Dziadek, Ricarda Gohl, Karsten Ferraccioli, Fausto Kaul, Norbert Spiegel, Cornelia 2018 https://epic.awi.de/id/eprint/46043/ https://hdl.handle.net/10013/epic.1ef17e0c-1de8-4483-a54d-43c0caf759fd unknown Dziadek, R. , Gohl, K. orcid:0000-0002-9558-2116 , Ferraccioli, F. , Kaul, N. and Spiegel, C. (2018) Geothermal heat flux derived from airborne magnetic grids and measured temperature gradients in the Amundsen Sea sector of West Antarctica , 27th International Polar Conference, Rostock, 25 March 2018 - 29 March 2018 . hdl:10013/epic.1ef17e0c-1de8-4483-a54d-43c0caf759fd EPIC327th International Polar Conference, Rostock, 2018-03-25-2018-03-29 Conference notRev 2018 ftawi 2021-12-24T15:43:28Z The West Antarctic Rift System is one of the least understood rift systems on earth, but displays a unique coupled relationship between tectonic processes and ice sheet dynamics. Geothermal heat flux is a poorly constrained parameter in Antarctica and suspected to affect basal conditions of ice sheets, i.e., basal melting and subglacial hydrology. Thermomechanical models demonstrate the influential boundary condition of geothermal heat flux for (paleo-)ice sheet stability. Young, continental rift systems are regions with significantly elevated geothermal heat flux, because the transient thermal perturbation to the lithosphere caused by rifting requires ~100 Ma to reach long-term thermal equilibrium. We discuss airborne, high-resolution magnetic anomaly data from the Amundsen Sea sector to provide additional insight into deeper crustal structures related to the West Antarctic Rift System in the Amundsen Sea sector. Using depth-to-the-bottom of the magnetic source (DBMS) estimates, we reveal spatial changes at the bottom of the igneous crust and the thickness of the magnetic layer, which can be further incorporated into tectonic interpretations and which is used to derive geothermal heat flux, supplemented by heat flux derived from measured temperature gradients in shelf sediments. We relate the distribution of geothermal heat flux to paleo and present ice sheet flow conditions. Conference Object Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet West Antarctica Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic West Antarctica Amundsen Sea |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
The West Antarctic Rift System is one of the least understood rift systems on earth, but displays a unique coupled relationship between tectonic processes and ice sheet dynamics. Geothermal heat flux is a poorly constrained parameter in Antarctica and suspected to affect basal conditions of ice sheets, i.e., basal melting and subglacial hydrology. Thermomechanical models demonstrate the influential boundary condition of geothermal heat flux for (paleo-)ice sheet stability. Young, continental rift systems are regions with significantly elevated geothermal heat flux, because the transient thermal perturbation to the lithosphere caused by rifting requires ~100 Ma to reach long-term thermal equilibrium. We discuss airborne, high-resolution magnetic anomaly data from the Amundsen Sea sector to provide additional insight into deeper crustal structures related to the West Antarctic Rift System in the Amundsen Sea sector. Using depth-to-the-bottom of the magnetic source (DBMS) estimates, we reveal spatial changes at the bottom of the igneous crust and the thickness of the magnetic layer, which can be further incorporated into tectonic interpretations and which is used to derive geothermal heat flux, supplemented by heat flux derived from measured temperature gradients in shelf sediments. We relate the distribution of geothermal heat flux to paleo and present ice sheet flow conditions. |
format |
Conference Object |
author |
Dziadek, Ricarda Gohl, Karsten Ferraccioli, Fausto Kaul, Norbert Spiegel, Cornelia |
spellingShingle |
Dziadek, Ricarda Gohl, Karsten Ferraccioli, Fausto Kaul, Norbert Spiegel, Cornelia Geothermal heat flux derived from airborne magnetic grids and measured temperature gradients in the Amundsen Sea sector of West Antarctica |
author_facet |
Dziadek, Ricarda Gohl, Karsten Ferraccioli, Fausto Kaul, Norbert Spiegel, Cornelia |
author_sort |
Dziadek, Ricarda |
title |
Geothermal heat flux derived from airborne magnetic grids and measured temperature gradients in the Amundsen Sea sector of West Antarctica |
title_short |
Geothermal heat flux derived from airborne magnetic grids and measured temperature gradients in the Amundsen Sea sector of West Antarctica |
title_full |
Geothermal heat flux derived from airborne magnetic grids and measured temperature gradients in the Amundsen Sea sector of West Antarctica |
title_fullStr |
Geothermal heat flux derived from airborne magnetic grids and measured temperature gradients in the Amundsen Sea sector of West Antarctica |
title_full_unstemmed |
Geothermal heat flux derived from airborne magnetic grids and measured temperature gradients in the Amundsen Sea sector of West Antarctica |
title_sort |
geothermal heat flux derived from airborne magnetic grids and measured temperature gradients in the amundsen sea sector of west antarctica |
publishDate |
2018 |
url |
https://epic.awi.de/id/eprint/46043/ https://hdl.handle.net/10013/epic.1ef17e0c-1de8-4483-a54d-43c0caf759fd |
geographic |
Antarctic West Antarctica Amundsen Sea |
geographic_facet |
Antarctic West Antarctica Amundsen Sea |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet West Antarctica |
op_source |
EPIC327th International Polar Conference, Rostock, 2018-03-25-2018-03-29 |
op_relation |
Dziadek, R. , Gohl, K. orcid:0000-0002-9558-2116 , Ferraccioli, F. , Kaul, N. and Spiegel, C. (2018) Geothermal heat flux derived from airborne magnetic grids and measured temperature gradients in the Amundsen Sea sector of West Antarctica , 27th International Polar Conference, Rostock, 25 March 2018 - 29 March 2018 . hdl:10013/epic.1ef17e0c-1de8-4483-a54d-43c0caf759fd |
_version_ |
1766373866567892992 |