3D glacial-isostatic adjustment models using geodynamically constrained Earth structures
The interaction between ice sheets and the solid Earth plays an important role for ice-sheet stability and sea-level change and hence for global climate models. Glacial-isostatic adjustment (GIA) models enable simulation of the solid Earth response due to variations in ice-sheet and ocean loading an...
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ftoceanrep:oai:oceanrep.geomar.de:55525 2023-05-15T16:40:18+02:00 3D glacial-isostatic adjustment models using geodynamically constrained Earth structures Bagge, Meike Klemann, Volker Steinberger, Bernhard Latinović, Milena Thomas, Maik 2021 https://oceanrep.geomar.de/id/eprint/55525/ unknown Bagge, M., Klemann, V., Steinberger, B., Latinović, M. and Thomas, M. (2021) 3D glacial-isostatic adjustment models using geodynamically constrained Earth structures. [PICO] In: German-Swiss Geodynamics Workshop 2021. , 29.08.-01.09.2021, Bad Belzig, Germany . info:eu-repo/semantics/closedAccess Conference or Workshop Item NonPeerReviewed 2021 ftoceanrep 2023-04-07T16:01:26Z The interaction between ice sheets and the solid Earth plays an important role for ice-sheet stability and sea-level change and hence for global climate models. Glacial-isostatic adjustment (GIA) models enable simulation of the solid Earth response due to variations in ice-sheet and ocean loading and prediction of the relative sea-level change. Because the viscoelastic response of the solid Earth depends on both ice-sheet distribution and the Earth’s rheology, independent constraints for the Earth structure in GIA models are beneficial. Seismic tomography models facilitate insights into the Earth’s interior, revealing lateral variability of the mantle viscosity that allows studying its relevance in GIA modeling. Especially, in regions of low mantle viscosity, the predicted surface deformations generated with such 3D GIA models differ considerably from those generated by traditional GIA models with radially symmetric structures. But also, the conversion from seismic velocity variations to viscosity is affected by a set of uncertainties. Here, we apply geodynamically constrained 3D Earth structures. We analyze the impact of conversion parameters (reduction factor in Arrhenius law and radial viscosity profile) on relative sea-level predictions. Furthermore, we focus on exemplary low-viscosity regions like the Cascadian subduction zone and southern Patagonia, which coincide with significant ice-mass changes. Conference Object Ice Sheet OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Patagonia |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
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The interaction between ice sheets and the solid Earth plays an important role for ice-sheet stability and sea-level change and hence for global climate models. Glacial-isostatic adjustment (GIA) models enable simulation of the solid Earth response due to variations in ice-sheet and ocean loading and prediction of the relative sea-level change. Because the viscoelastic response of the solid Earth depends on both ice-sheet distribution and the Earth’s rheology, independent constraints for the Earth structure in GIA models are beneficial. Seismic tomography models facilitate insights into the Earth’s interior, revealing lateral variability of the mantle viscosity that allows studying its relevance in GIA modeling. Especially, in regions of low mantle viscosity, the predicted surface deformations generated with such 3D GIA models differ considerably from those generated by traditional GIA models with radially symmetric structures. But also, the conversion from seismic velocity variations to viscosity is affected by a set of uncertainties. Here, we apply geodynamically constrained 3D Earth structures. We analyze the impact of conversion parameters (reduction factor in Arrhenius law and radial viscosity profile) on relative sea-level predictions. Furthermore, we focus on exemplary low-viscosity regions like the Cascadian subduction zone and southern Patagonia, which coincide with significant ice-mass changes. |
format |
Conference Object |
author |
Bagge, Meike Klemann, Volker Steinberger, Bernhard Latinović, Milena Thomas, Maik |
spellingShingle |
Bagge, Meike Klemann, Volker Steinberger, Bernhard Latinović, Milena Thomas, Maik 3D glacial-isostatic adjustment models using geodynamically constrained Earth structures |
author_facet |
Bagge, Meike Klemann, Volker Steinberger, Bernhard Latinović, Milena Thomas, Maik |
author_sort |
Bagge, Meike |
title |
3D glacial-isostatic adjustment models using geodynamically constrained Earth structures |
title_short |
3D glacial-isostatic adjustment models using geodynamically constrained Earth structures |
title_full |
3D glacial-isostatic adjustment models using geodynamically constrained Earth structures |
title_fullStr |
3D glacial-isostatic adjustment models using geodynamically constrained Earth structures |
title_full_unstemmed |
3D glacial-isostatic adjustment models using geodynamically constrained Earth structures |
title_sort |
3d glacial-isostatic adjustment models using geodynamically constrained earth structures |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/55525/ |
geographic |
Patagonia |
geographic_facet |
Patagonia |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Bagge, M., Klemann, V., Steinberger, B., Latinović, M. and Thomas, M. (2021) 3D glacial-isostatic adjustment models using geodynamically constrained Earth structures. [PICO] In: German-Swiss Geodynamics Workshop 2021. , 29.08.-01.09.2021, Bad Belzig, Germany . |
op_rights |
info:eu-repo/semantics/closedAccess |
_version_ |
1766030679413358592 |