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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ftdtupubl:oai:pure.atira.dk:publications/77695c23-d78f-4520-8cec-d29c8cec6121 2023-12-24T10:15:20+01:00 GRACE constraints on Earth rheology of the Barents Sea and Fennoscandia Rovira-Navarro, Marc Van Der Wal, Wouter Barletta, Valentina R. C. Root, Bart Sørensen, Louise Sandberg 2020 application/pdf https://orbit.dtu.dk/en/publications/77695c23-d78f-4520-8cec-d29c8cec6121 https://doi.org/10.5194/se-11-379-2020 https://backend.orbit.dtu.dk/ws/files/210077477/se_11_379_2020.pdf eng eng https://orbit.dtu.dk/en/publications/77695c23-d78f-4520-8cec-d29c8cec6121 info:eu-repo/semantics/openAccess Rovira-Navarro , M , Van Der Wal , W , Barletta , V R , C. Root , B & Sørensen , L S 2020 , ' GRACE constraints on Earth rheology of the Barents Sea and Fennoscandia ' , Solid Earth , vol. 11 , no. 2 , pp. 379-395 . https://doi.org/10.5194/se-11-379-2020 article 2020 ftdtupubl https://doi.org/10.5194/se-11-379-2020 2023-11-30T00:03:47Z 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 3×10 20 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 Technical University of Denmark: DTU Orbit Barents Sea Solid Earth 11 2 379 395 |
institution |
Open Polar |
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Technical University of Denmark: DTU Orbit |
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ftdtupubl |
language |
English |
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 3×10 20 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. C. Root, Bart Sørensen, Louise Sandberg |
spellingShingle |
Rovira-Navarro, Marc Van Der Wal, Wouter Barletta, Valentina R. C. Root, Bart Sørensen, Louise Sandberg GRACE constraints on Earth rheology of the Barents Sea and Fennoscandia |
author_facet |
Rovira-Navarro, Marc Van Der Wal, Wouter Barletta, Valentina R. C. Root, Bart Sørensen, Louise Sandberg |
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 |
publishDate |
2020 |
url |
https://orbit.dtu.dk/en/publications/77695c23-d78f-4520-8cec-d29c8cec6121 https://doi.org/10.5194/se-11-379-2020 https://backend.orbit.dtu.dk/ws/files/210077477/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_source |
Rovira-Navarro , M , Van Der Wal , W , Barletta , V R , C. Root , B & Sørensen , L S 2020 , ' GRACE constraints on Earth rheology of the Barents Sea and Fennoscandia ' , Solid Earth , vol. 11 , no. 2 , pp. 379-395 . https://doi.org/10.5194/se-11-379-2020 |
op_relation |
https://orbit.dtu.dk/en/publications/77695c23-d78f-4520-8cec-d29c8cec6121 |
op_rights |
info:eu-repo/semantics/openAccess |
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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1786202104124145664 |