GRACE constraints on Earth rheology of the Barents Sea and Fennoscandia
The Barents Sea is situated on a continental margin and was home to a large ice sheet at the Last Glacial Maximum. Studying the solid Earth response to the removal of this ice sheet (glacial isostatic adjustment; GIA) can give insight into the subsurface rheology of this region. However, because the...
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Copernicus Publications
2020
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00051028 2023-05-15T15:38:29+02:00 GRACE constraints on Earth rheology of the Barents Sea and Fennoscandia Rovira-Navarro, Marc van der Wal, Wouter Barletta, Valentina R. Root, Bart C. Sandberg Sørensen, Louise 2020-03 electronic https://doi.org/10.5194/se-11-379-2020 https://noa.gwlb.de/receive/cop_mods_00051028 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050685/se-11-379-2020.pdf https://se.copernicus.org/articles/11/379/2020/se-11-379-2020.pdf eng eng Copernicus Publications Solid Earth -- 1869-9529 https://doi.org/10.5194/se-11-379-2020 https://noa.gwlb.de/receive/cop_mods_00051028 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050685/se-11-379-2020.pdf https://se.copernicus.org/articles/11/379/2020/se-11-379-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/se-11-379-2020 2022-02-08T22:36:34Z The Barents Sea is situated on a continental margin and was home to a large ice sheet at the Last Glacial Maximum. Studying the solid Earth response to the removal of this ice sheet (glacial isostatic adjustment; GIA) can give insight into the subsurface rheology of this region. However, because the region is currently covered by ocean, uplift measurements from the center of the former ice sheet are not available. The Gravity Recovery and Climate Experiment (GRACE) gravity data have been shown to be able to constrain GIA. Here we analyze GRACE data for the period 2003–2015 in the Barents Sea and use the data to constrain GIA models for the region. We study the effect of uncertainty in non-tidal ocean mass models that are used to correct GRACE data and find that it should be taken into account when studying solid Earth signals in oceanic areas from GRACE. We compare GRACE-derived gravity disturbance rates with GIA model predictions for different ice deglaciation chronologies of the last glacial cycle and find that best-fitting models have an upper mantle viscosity equal or higher than 3×1020 Pa s. Following a similar procedure for Fennoscandia we find that the preferred upper mantle viscosity there is a factor 2 larger than in the Barents Sea for a range of lithospheric thickness values. This factor is shown to be consistent with the ratio of viscosities derived for both regions from global seismic models. The viscosity difference can serve as constraint for geodynamic models of the area. Article in Journal/Newspaper Barents Sea Fennoscandia Ice Sheet Niedersächsisches Online-Archiv NOA Barents Sea Solid Earth 11 2 379 395 |
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Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Rovira-Navarro, Marc van der Wal, Wouter Barletta, Valentina R. Root, Bart C. Sandberg Sørensen, Louise GRACE constraints on Earth rheology of the Barents Sea and Fennoscandia |
topic_facet |
article Verlagsveröffentlichung |
description |
The Barents Sea is situated on a continental margin and was home to a large ice sheet at the Last Glacial Maximum. Studying the solid Earth response to the removal of this ice sheet (glacial isostatic adjustment; GIA) can give insight into the subsurface rheology of this region. However, because the region is currently covered by ocean, uplift measurements from the center of the former ice sheet are not available. The Gravity Recovery and Climate Experiment (GRACE) gravity data have been shown to be able to constrain GIA. Here we analyze GRACE data for the period 2003–2015 in the Barents Sea and use the data to constrain GIA models for the region. We study the effect of uncertainty in non-tidal ocean mass models that are used to correct GRACE data and find that it should be taken into account when studying solid Earth signals in oceanic areas from GRACE. We compare GRACE-derived gravity disturbance rates with GIA model predictions for different ice deglaciation chronologies of the last glacial cycle and find that best-fitting models have an upper mantle viscosity equal or higher than 3×1020 Pa s. Following a similar procedure for Fennoscandia we find that the preferred upper mantle viscosity there is a factor 2 larger than in the Barents Sea for a range of lithospheric thickness values. This factor is shown to be consistent with the ratio of viscosities derived for both regions from global seismic models. The viscosity difference can serve as constraint for geodynamic models of the area. |
format |
Article in Journal/Newspaper |
author |
Rovira-Navarro, Marc van der Wal, Wouter Barletta, Valentina R. Root, Bart C. Sandberg Sørensen, Louise |
author_facet |
Rovira-Navarro, Marc van der Wal, Wouter Barletta, Valentina R. Root, Bart C. Sandberg Sørensen, Louise |
author_sort |
Rovira-Navarro, Marc |
title |
GRACE constraints on Earth rheology of the Barents Sea and Fennoscandia |
title_short |
GRACE constraints on Earth rheology of the Barents Sea and Fennoscandia |
title_full |
GRACE constraints on Earth rheology of the Barents Sea and Fennoscandia |
title_fullStr |
GRACE constraints on Earth rheology of the Barents Sea and Fennoscandia |
title_full_unstemmed |
GRACE constraints on Earth rheology of the Barents Sea and Fennoscandia |
title_sort |
grace constraints on earth rheology of the barents sea and fennoscandia |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/se-11-379-2020 https://noa.gwlb.de/receive/cop_mods_00051028 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050685/se-11-379-2020.pdf https://se.copernicus.org/articles/11/379/2020/se-11-379-2020.pdf |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea Fennoscandia Ice Sheet |
genre_facet |
Barents Sea Fennoscandia Ice Sheet |
op_relation |
Solid Earth -- 1869-9529 https://doi.org/10.5194/se-11-379-2020 https://noa.gwlb.de/receive/cop_mods_00051028 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050685/se-11-379-2020.pdf https://se.copernicus.org/articles/11/379/2020/se-11-379-2020.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/se-11-379-2020 |
container_title |
Solid Earth |
container_volume |
11 |
container_issue |
2 |
container_start_page |
379 |
op_container_end_page |
395 |
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