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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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5009158 2023-05-15T16:40:18+02:00 3D glacial-isostatic adjustment models using geodynamically constrained Earth structures Bagge, M. Klemann, V. Steinberger, B. Latinovic, M. Thomas, M. 2021 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5009158 eng eng info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu21-13479 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5009158 Abstracts info:eu-repo/semantics/conferenceObject 2021 ftgfzpotsdam https://doi.org/10.5194/egusphere-egu21-13479 2022-09-14T05:57:59Z 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 GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Patagonia |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
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, M. Klemann, V. Steinberger, B. Latinovic, M. Thomas, M. |
spellingShingle |
Bagge, M. Klemann, V. Steinberger, B. Latinovic, M. Thomas, M. 3D glacial-isostatic adjustment models using geodynamically constrained Earth structures |
author_facet |
Bagge, M. Klemann, V. Steinberger, B. Latinovic, M. Thomas, M. |
author_sort |
Bagge, M. |
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://gfzpublic.gfz-potsdam.de/pubman/item/item_5009158 |
geographic |
Patagonia |
geographic_facet |
Patagonia |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Abstracts |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu21-13479 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5009158 |
op_doi |
https://doi.org/10.5194/egusphere-egu21-13479 |
_version_ |
1766030683565719552 |