Interior thermal state of Enceladus inferred from the viscoelastic state of the ice shell
Recent geodetic measurements for Enceladus suggest a global subsurface ocean that is thicker beneath the south pole. In order to maintain such an ocean, viscous relaxation of topography at the base of the ice shell and melting of ice need to be balanced. In this study, we investigate the interior th...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/72823 2023-05-15T18:22:17+02:00 Interior thermal state of Enceladus inferred from the viscoelastic state of the ice shell Kamata, Shunichi Nimmo, Francis http://hdl.handle.net/2115/72823 https://doi.org/10.1016/j.icarus.2016.11.034 eng eng Elsevier http://hdl.handle.net/2115/72823 Icarus, 284: 387-393 http://dx.doi.org/10.1016/j.icarus.2016.11.034 (C) 2016 Elsevier Inc. All rights reserved. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ http://creativecommons.org/licenses/by-nc-nd/4.0/ CC-BY-NC-ND Enceladus Planetary dynamics Interiors 450 article (author version) fthokunivhus https://doi.org/10.1016/j.icarus.2016.11.034 2022-11-18T01:04:10Z Recent geodetic measurements for Enceladus suggest a global subsurface ocean that is thicker beneath the south pole. In order to maintain such an ocean, viscous relaxation of topography at the base of the ice shell and melting of ice need to be balanced. In this study, we investigate the interior thermal state that can lead to the relaxation timescale being comparable to the melting timescale. Our results indicate that a basal heat flux about ten times higher than that due to radiogenic heating, or an ice shell tidal heating rate about ten times higher than the conventional estimate of 1.1 GW is necessary if the ice shell is in thermal equilibrium. These requirements are concordant with recent astrometric studies. Article in Journal/Newspaper South pole Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) South Pole Icarus 284 387 393 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Enceladus Planetary dynamics Interiors 450 |
spellingShingle |
Enceladus Planetary dynamics Interiors 450 Kamata, Shunichi Nimmo, Francis Interior thermal state of Enceladus inferred from the viscoelastic state of the ice shell |
topic_facet |
Enceladus Planetary dynamics Interiors 450 |
description |
Recent geodetic measurements for Enceladus suggest a global subsurface ocean that is thicker beneath the south pole. In order to maintain such an ocean, viscous relaxation of topography at the base of the ice shell and melting of ice need to be balanced. In this study, we investigate the interior thermal state that can lead to the relaxation timescale being comparable to the melting timescale. Our results indicate that a basal heat flux about ten times higher than that due to radiogenic heating, or an ice shell tidal heating rate about ten times higher than the conventional estimate of 1.1 GW is necessary if the ice shell is in thermal equilibrium. These requirements are concordant with recent astrometric studies. |
format |
Article in Journal/Newspaper |
author |
Kamata, Shunichi Nimmo, Francis |
author_facet |
Kamata, Shunichi Nimmo, Francis |
author_sort |
Kamata, Shunichi |
title |
Interior thermal state of Enceladus inferred from the viscoelastic state of the ice shell |
title_short |
Interior thermal state of Enceladus inferred from the viscoelastic state of the ice shell |
title_full |
Interior thermal state of Enceladus inferred from the viscoelastic state of the ice shell |
title_fullStr |
Interior thermal state of Enceladus inferred from the viscoelastic state of the ice shell |
title_full_unstemmed |
Interior thermal state of Enceladus inferred from the viscoelastic state of the ice shell |
title_sort |
interior thermal state of enceladus inferred from the viscoelastic state of the ice shell |
publisher |
Elsevier |
url |
http://hdl.handle.net/2115/72823 https://doi.org/10.1016/j.icarus.2016.11.034 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
http://hdl.handle.net/2115/72823 Icarus, 284: 387-393 http://dx.doi.org/10.1016/j.icarus.2016.11.034 |
op_rights |
(C) 2016 Elsevier Inc. All rights reserved. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.icarus.2016.11.034 |
container_title |
Icarus |
container_volume |
284 |
container_start_page |
387 |
op_container_end_page |
393 |
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1766201669514690560 |