North American Pleistocene Glacial Erosion and Thin Pliocene Regolith Thickness Inferred from Data-Constrained Fully Coupled Ice-Climate-Sediment modelling
Beyond the impact of glacial isostatic adjustment, landscape evolution is typically neglected at large scale when considering the basal boundary condition for ice sheet and climate modelling over past glacial cycles. Erosion and changing sediment loads impact bed elevation, land/sea mask, and basal...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00072224 2024-04-14T08:13:13+00:00 North American Pleistocene Glacial Erosion and Thin Pliocene Regolith Thickness Inferred from Data-Constrained Fully Coupled Ice-Climate-Sediment modelling Drew, Matthew Tarasov, Lev 2024-03 electronic https://doi.org/10.5194/egusphere-2024-620 https://noa.gwlb.de/receive/cop_mods_00072224 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00070447/egusphere-2024-620.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2024-620/egusphere-2024-620.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2024-620 https://noa.gwlb.de/receive/cop_mods_00072224 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00070447/egusphere-2024-620.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2024-620/egusphere-2024-620.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2024 ftnonlinearchiv https://doi.org/10.5194/egusphere-2024-620 2024-03-19T12:18:16Z Beyond the impact of glacial isostatic adjustment, landscape evolution is typically neglected at large scale when considering the basal boundary condition for ice sheet and climate modelling over past glacial cycles. Erosion and changing sediment loads impact bed elevation, land/sea mask, and basal drag. To date, how the above affects past ice sheet evolution is unclear. Constraining the role that Pliocene regolith may have played in Pleistocene glacial cycle variability requires bounds on the amount of regolith preceding those glacial cycles. However, quantitative bounds on regolith thickness at the spatial scale of the glaciated regions of North America are currently absent in the literature. To address the above, we present an updated sediment production and transport model with dynamically calculated soft sediment mask, isostatic adjustment to dynamical sediment load and bedrock erosion, and a new subglacial hydrology model coupled to the Glacial Systems Model. The coupled model is capable of multi-million year integrations driven only by greenhouse gas concentration and insolation. The model passes a set of verification tests and conserves mass. We assess parametric sensitivity of sediment transport rates. We compare the final sediment solutions in an ensemble of whole-Pleistocene simulations for a range of initial (Pliocene) regolith thicknesses against multiple estimates for present day drift thickness distribution, Quaternary sediment volume in the Atlantic Ocean, and erosion depth estimates. Consistency of modelling and data constraints requires a Pliocene regolith thickness of less than 50 m. Article in Journal/Newspaper Ice Sheet Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Drew, Matthew Tarasov, Lev North American Pleistocene Glacial Erosion and Thin Pliocene Regolith Thickness Inferred from Data-Constrained Fully Coupled Ice-Climate-Sediment modelling |
topic_facet |
article Verlagsveröffentlichung |
description |
Beyond the impact of glacial isostatic adjustment, landscape evolution is typically neglected at large scale when considering the basal boundary condition for ice sheet and climate modelling over past glacial cycles. Erosion and changing sediment loads impact bed elevation, land/sea mask, and basal drag. To date, how the above affects past ice sheet evolution is unclear. Constraining the role that Pliocene regolith may have played in Pleistocene glacial cycle variability requires bounds on the amount of regolith preceding those glacial cycles. However, quantitative bounds on regolith thickness at the spatial scale of the glaciated regions of North America are currently absent in the literature. To address the above, we present an updated sediment production and transport model with dynamically calculated soft sediment mask, isostatic adjustment to dynamical sediment load and bedrock erosion, and a new subglacial hydrology model coupled to the Glacial Systems Model. The coupled model is capable of multi-million year integrations driven only by greenhouse gas concentration and insolation. The model passes a set of verification tests and conserves mass. We assess parametric sensitivity of sediment transport rates. We compare the final sediment solutions in an ensemble of whole-Pleistocene simulations for a range of initial (Pliocene) regolith thicknesses against multiple estimates for present day drift thickness distribution, Quaternary sediment volume in the Atlantic Ocean, and erosion depth estimates. Consistency of modelling and data constraints requires a Pliocene regolith thickness of less than 50 m. |
format |
Article in Journal/Newspaper |
author |
Drew, Matthew Tarasov, Lev |
author_facet |
Drew, Matthew Tarasov, Lev |
author_sort |
Drew, Matthew |
title |
North American Pleistocene Glacial Erosion and Thin Pliocene Regolith Thickness Inferred from Data-Constrained Fully Coupled Ice-Climate-Sediment modelling |
title_short |
North American Pleistocene Glacial Erosion and Thin Pliocene Regolith Thickness Inferred from Data-Constrained Fully Coupled Ice-Climate-Sediment modelling |
title_full |
North American Pleistocene Glacial Erosion and Thin Pliocene Regolith Thickness Inferred from Data-Constrained Fully Coupled Ice-Climate-Sediment modelling |
title_fullStr |
North American Pleistocene Glacial Erosion and Thin Pliocene Regolith Thickness Inferred from Data-Constrained Fully Coupled Ice-Climate-Sediment modelling |
title_full_unstemmed |
North American Pleistocene Glacial Erosion and Thin Pliocene Regolith Thickness Inferred from Data-Constrained Fully Coupled Ice-Climate-Sediment modelling |
title_sort |
north american pleistocene glacial erosion and thin pliocene regolith thickness inferred from data-constrained fully coupled ice-climate-sediment modelling |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/egusphere-2024-620 https://noa.gwlb.de/receive/cop_mods_00072224 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00070447/egusphere-2024-620.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2024-620/egusphere-2024-620.pdf |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://doi.org/10.5194/egusphere-2024-620 https://noa.gwlb.de/receive/cop_mods_00072224 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00070447/egusphere-2024-620.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2024-620/egusphere-2024-620.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/egusphere-2024-620 |
_version_ |
1796311151821193216 |