The impact of spatially varying ice sheet basal conditions on sliding at glacial time scales
Spatially variable basal conditions are thought to govern how ice sheets behave at glacial time scales (>1000 years) and responsible for changes in dynamics between the core and peripheral regions of the Laurentide and Fennoscandian ice sheets. Basal motion is accomplished via the deformation of...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Cambridge University Press
2023-08-01
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| Series: | Journal of Glaciology |
| Subjects: | |
| Online Access: | https://www.cambridge.org/core/product/identifier/S0022143022001253/type/journal_article |
| _version_ | 1797770543409135616 |
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| author | Evan J. Gowan Sebastian Hinck Lu Niu Caroline Clason Gerrit Lohmann |
| author_facet | Evan J. Gowan Sebastian Hinck Lu Niu Caroline Clason Gerrit Lohmann |
| author_sort | Evan J. Gowan |
| collection | DOAJ |
| description | Spatially variable basal conditions are thought to govern how ice sheets behave at glacial time scales (>1000 years) and responsible for changes in dynamics between the core and peripheral regions of the Laurentide and Fennoscandian ice sheets. Basal motion is accomplished via the deformation of unconsolidated sediments, or via sliding of the ice over an undeformable bed. We present an ice sheet sliding module for the Parallel Ice Sheet Model (PISM) that takes into account changes in sediment cover and incorporates surface meltwater. This model routes meltwater, produced at the surface and base of the ice sheet, toward the margin of the ice sheet. Basal sliding is accomplished through the deformation of water saturated sediments, or sliding at the ice-bed interface. In areas with continuous, water saturated sediments, sliding is almost always accomplished through sediment deformation. In areas with incomplete cover, sliding has a stronger dependence on the supply of water. We find that the addition of surface meltwater to the base is a more important factor for ice sheet evolution than the style of sliding. In a glacial cycle simulation, our model causes a more rapid buildup of the Laurentide Ice Sheet. |
| first_indexed | 2024-03-12T21:23:45Z |
| format | Article |
| id | doaj.art-779fe7048a96419c86cf931a68a14d11 |
| institution | Directory Open Access Journal |
| issn | 0022-1430 1727-5652 |
| language | English |
| last_indexed | 2024-03-12T21:23:45Z |
| publishDate | 2023-08-01 |
| publisher | Cambridge University Press |
| record_format | Article |
| series | Journal of Glaciology |
| spelling | doaj.art-779fe7048a96419c86cf931a68a14d112023-07-28T10:47:45ZengCambridge University PressJournal of Glaciology0022-14301727-56522023-08-01691056107010.1017/jog.2022.125The impact of spatially varying ice sheet basal conditions on sliding at glacial time scalesEvan J. Gowan0https://orcid.org/0000-0002-0119-9440Sebastian Hinck1Lu Niu2https://orcid.org/0000-0002-8314-7416Caroline Clason3https://orcid.org/0000-0001-8236-2555Gerrit Lohmann4Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany MARUM, University of Bremen, Bremen, Germany Faculty of Advanced Science and Technology, Department of Earth and Environmental Sciences, Kumamoto University, Kumamoto, JapanAlfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, GermanyAlfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, GermanyDepartment of Geography, Durham University, Durham, United KingdomAlfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany MARUM, University of Bremen, Bremen, GermanySpatially variable basal conditions are thought to govern how ice sheets behave at glacial time scales (>1000 years) and responsible for changes in dynamics between the core and peripheral regions of the Laurentide and Fennoscandian ice sheets. Basal motion is accomplished via the deformation of unconsolidated sediments, or via sliding of the ice over an undeformable bed. We present an ice sheet sliding module for the Parallel Ice Sheet Model (PISM) that takes into account changes in sediment cover and incorporates surface meltwater. This model routes meltwater, produced at the surface and base of the ice sheet, toward the margin of the ice sheet. Basal sliding is accomplished through the deformation of water saturated sediments, or sliding at the ice-bed interface. In areas with continuous, water saturated sediments, sliding is almost always accomplished through sediment deformation. In areas with incomplete cover, sliding has a stronger dependence on the supply of water. We find that the addition of surface meltwater to the base is a more important factor for ice sheet evolution than the style of sliding. In a glacial cycle simulation, our model causes a more rapid buildup of the Laurentide Ice Sheet.https://www.cambridge.org/core/product/identifier/S0022143022001253/type/journal_articleIce-sheet modelingice velocitysubglacial processespaleoclimate |
| spellingShingle | Evan J. Gowan Sebastian Hinck Lu Niu Caroline Clason Gerrit Lohmann The impact of spatially varying ice sheet basal conditions on sliding at glacial time scales Journal of Glaciology Ice-sheet modeling ice velocity subglacial processes paleoclimate |
| title | The impact of spatially varying ice sheet basal conditions on sliding at glacial time scales |
| title_full | The impact of spatially varying ice sheet basal conditions on sliding at glacial time scales |
| title_fullStr | The impact of spatially varying ice sheet basal conditions on sliding at glacial time scales |
| title_full_unstemmed | The impact of spatially varying ice sheet basal conditions on sliding at glacial time scales |
| title_short | The impact of spatially varying ice sheet basal conditions on sliding at glacial time scales |
| title_sort | impact of spatially varying ice sheet basal conditions on sliding at glacial time scales |
| topic | Ice-sheet modeling ice velocity subglacial processes paleoclimate |
| url | https://www.cambridge.org/core/product/identifier/S0022143022001253/type/journal_article |
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