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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Main Authors: Dziadek, Ricarda, Gohl, Karsten, Ferraccioli, Fausto, Kaul, Norbert, Spiegel, Cornelia
Format: Conference Object
Language:unknown
Published: 2018
Subjects:
Online Access:https://epic.awi.de/id/eprint/46043/
https://hdl.handle.net/10013/epic.1ef17e0c-1de8-4483-a54d-43c0caf759fd
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spelling 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
institution Open Polar
collection Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
op_collection_id 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
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