Joint Inversion for Surface Accumulation Rate and Geothermal Heat Flow From Ice-Penetrating Radar Observations at Dome A, East Antarctica. Part I:Model Description, Data Constraints, and Inversion Results
Ice-penetrating radar data contain a wealth of information about the bed and internal structure of the ice sheet. While these data have long been used to diagnose the presence of basal water, infer attenuation rates, or explore the internal stratigraphy of the ice sheet, they have rarely been used j...
Published in: | Journal of Geophysical Research: Earth Surface |
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2021
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ftulaplandcdispu:oai:lacris.ulapland.fi:publications/ef381d10-6955-41be-b986-bd687d6ac02a 2024-04-21T07:52:33+00:00 Joint Inversion for Surface Accumulation Rate and Geothermal Heat Flow From Ice-Penetrating Radar Observations at Dome A, East Antarctica. Part I:Model Description, Data Constraints, and Inversion Results Wolovick, M. J. Moore, J. C. Zhao, L. 2021-05 https://research.ulapland.fi/fi/publications/ef381d10-6955-41be-b986-bd687d6ac02a https://doi.org/10.1029/2020JF005937 http://www.scopus.com/inward/record.url?scp=85106890494&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85106890494&partnerID=8YFLogxK eng eng https://research.ulapland.fi/fi/publications/ef381d10-6955-41be-b986-bd687d6ac02a info:eu-repo/semantics/closedAccess Wolovick , M J , Moore , J C & Zhao , L 2021 , ' Joint Inversion for Surface Accumulation Rate and Geothermal Heat Flow From Ice-Penetrating Radar Observations at Dome A, East Antarctica. Part I : Model Description, Data Constraints, and Inversion Results ' , Journal of Geophysical Research: Earth Surface , vol. 126 , no. 5 , e2020JF005937 . https://doi.org/10.1029/2020JF005937 Dome A East Antarctica genetic algorithm ice model ice-penetrating radar inversion /dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences article 2021 ftulaplandcdispu https://doi.org/10.1029/2020JF005937 2024-03-25T17:48:09Z Ice-penetrating radar data contain a wealth of information about the bed and internal structure of the ice sheet. While these data have long been used to diagnose the presence of basal water, infer attenuation rates, or explore the internal stratigraphy of the ice sheet, they have rarely been used jointly in a formal inverse model for the ice sheet temperature structure. Here, we invert a coupled thermomechanical ice sheet and basal hydrology model to infer both geothermal heat flow (GHF) and accumulation rate from multiple classes of radar observations in the area around Dome A, East Antarctica. Our forward model solves for a coupled steady state between the ice sheet flow field, temperature, and basal hydrology, including melt, water transport, and freeze-on. We fit radar observations of basal water, freeze-on, and internal layers, along with a GHF prior based on aeromagnetic observations. We minimize the combined misfit function by first using an evolutionary algorithm followed by localized perturbation tests. In addition to inferring the spatial distribution of GHF and accumulation rate, we are also able to estimate the uncertainty about our best-fit answer, as well as quantify how our result depends on each individual data constraint. Our results demonstrate a new method for combining multiple glaciological constraints into a single inverse model of the ice sheet, and give us a more rigorous picture of the information content provided by each data set. In a companion paper we analyze and interpret the best-fit model. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Ice Sheet LaCRIS - University of Lapland Current Research System Journal of Geophysical Research: Earth Surface 126 5 |
institution |
Open Polar |
collection |
LaCRIS - University of Lapland Current Research System |
op_collection_id |
ftulaplandcdispu |
language |
English |
topic |
Dome A East Antarctica genetic algorithm ice model ice-penetrating radar inversion /dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences |
spellingShingle |
Dome A East Antarctica genetic algorithm ice model ice-penetrating radar inversion /dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences Wolovick, M. J. Moore, J. C. Zhao, L. Joint Inversion for Surface Accumulation Rate and Geothermal Heat Flow From Ice-Penetrating Radar Observations at Dome A, East Antarctica. Part I:Model Description, Data Constraints, and Inversion Results |
topic_facet |
Dome A East Antarctica genetic algorithm ice model ice-penetrating radar inversion /dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences |
description |
Ice-penetrating radar data contain a wealth of information about the bed and internal structure of the ice sheet. While these data have long been used to diagnose the presence of basal water, infer attenuation rates, or explore the internal stratigraphy of the ice sheet, they have rarely been used jointly in a formal inverse model for the ice sheet temperature structure. Here, we invert a coupled thermomechanical ice sheet and basal hydrology model to infer both geothermal heat flow (GHF) and accumulation rate from multiple classes of radar observations in the area around Dome A, East Antarctica. Our forward model solves for a coupled steady state between the ice sheet flow field, temperature, and basal hydrology, including melt, water transport, and freeze-on. We fit radar observations of basal water, freeze-on, and internal layers, along with a GHF prior based on aeromagnetic observations. We minimize the combined misfit function by first using an evolutionary algorithm followed by localized perturbation tests. In addition to inferring the spatial distribution of GHF and accumulation rate, we are also able to estimate the uncertainty about our best-fit answer, as well as quantify how our result depends on each individual data constraint. Our results demonstrate a new method for combining multiple glaciological constraints into a single inverse model of the ice sheet, and give us a more rigorous picture of the information content provided by each data set. In a companion paper we analyze and interpret the best-fit model. |
format |
Article in Journal/Newspaper |
author |
Wolovick, M. J. Moore, J. C. Zhao, L. |
author_facet |
Wolovick, M. J. Moore, J. C. Zhao, L. |
author_sort |
Wolovick, M. J. |
title |
Joint Inversion for Surface Accumulation Rate and Geothermal Heat Flow From Ice-Penetrating Radar Observations at Dome A, East Antarctica. Part I:Model Description, Data Constraints, and Inversion Results |
title_short |
Joint Inversion for Surface Accumulation Rate and Geothermal Heat Flow From Ice-Penetrating Radar Observations at Dome A, East Antarctica. Part I:Model Description, Data Constraints, and Inversion Results |
title_full |
Joint Inversion for Surface Accumulation Rate and Geothermal Heat Flow From Ice-Penetrating Radar Observations at Dome A, East Antarctica. Part I:Model Description, Data Constraints, and Inversion Results |
title_fullStr |
Joint Inversion for Surface Accumulation Rate and Geothermal Heat Flow From Ice-Penetrating Radar Observations at Dome A, East Antarctica. Part I:Model Description, Data Constraints, and Inversion Results |
title_full_unstemmed |
Joint Inversion for Surface Accumulation Rate and Geothermal Heat Flow From Ice-Penetrating Radar Observations at Dome A, East Antarctica. Part I:Model Description, Data Constraints, and Inversion Results |
title_sort |
joint inversion for surface accumulation rate and geothermal heat flow from ice-penetrating radar observations at dome a, east antarctica. part i:model description, data constraints, and inversion results |
publishDate |
2021 |
url |
https://research.ulapland.fi/fi/publications/ef381d10-6955-41be-b986-bd687d6ac02a https://doi.org/10.1029/2020JF005937 http://www.scopus.com/inward/record.url?scp=85106890494&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85106890494&partnerID=8YFLogxK |
genre |
Antarc* Antarctica East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica East Antarctica Ice Sheet |
op_source |
Wolovick , M J , Moore , J C & Zhao , L 2021 , ' Joint Inversion for Surface Accumulation Rate and Geothermal Heat Flow From Ice-Penetrating Radar Observations at Dome A, East Antarctica. Part I : Model Description, Data Constraints, and Inversion Results ' , Journal of Geophysical Research: Earth Surface , vol. 126 , no. 5 , e2020JF005937 . https://doi.org/10.1029/2020JF005937 |
op_relation |
https://research.ulapland.fi/fi/publications/ef381d10-6955-41be-b986-bd687d6ac02a |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1029/2020JF005937 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
126 |
container_issue |
5 |
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1796935774366597120 |