date: 2016-06-22T13:14:35Z pdf:PDFVersion: 1.6 pdf:docinfo:title: Sensitivity of Grounding-Line Dynamics to Viscoelastic Deformation of the Solid-Earth in an Idealized Scenario xmp:CreatorTool: Prinect Printready dc:description: We investigate the behaviour of the grounding line (GL) of an idealised ice sheet and ice shelf by coupling a thermomechanical ice-sheet model to a self-gravitating viscoelastic solid-Earth model (SGVEM) in which a gravitationally self-consistent sea-level evolution is considered. The steadystate ice-sheet ? shelf configuration is subject to forcing by sea-level rise, or altered surface mass balance and basal conditions, resulting in a retreat of the GL. We confirm previous studies showing that GL retreat can be decelerated and stopped by viscoelastic deformation of the solid Earth. We focus on the influence of lithosphere thickness and the upper mantle viscosity on the GL retreat and find that the time scales of solid-Earth relaxation, which are parameterised by the upper mantle viscosity, are most important for GL stability. We compare these retreat characteristics with results from the simpler ?elastic lithosphere ? relaxing asthenosphere? (ELRA) approximation of solid-Earth deformation, which is common in ice-sheet modelling. We find that the inconsistent description of sea level and the simplified relaxation behaviour of the ELRA approximation introduce an artificial bias on GL migration. Finally, we discuss the implications of similar time scales, on which ice dynamics and solid-Earth adjustment proceed, for the long-term stability of the ice sheet. access_permission:modify_annotations: true access_permission:can_print_degraded: true subject: We investigate the behaviour of the grounding line (GL) of an idealised ice sheet and ice shelf by coupling a thermomechanical ice-sheet model to a self-gravitating viscoelastic solid-Earth model (SGVEM) in which a gravitationally self-consistent sea-level evolution is considered. The steadystate ice-sheet ? shelf configuration is subject to forcing by sea-level rise, or altered surface mass balance and basal conditions, resulting in a retreat of the GL. We confirm previous studies showing that GL retreat can be decelerated and stopped by viscoelastic deformation of the solid Earth. We focus on the influence of lithosphere thickness and the upper mantle viscosity on the GL retreat and find that the time scales of solid-Earth relaxation, which are parameterised by the upper mantle viscosity, are most important for GL stability. We compare these retreat characteristics with results from the simpler ?elastic lithosphere ? relaxing asthenosphere? (ELRA) approximation of solid-Earth deformation, which is common in ice-sheet modelling. We find that the inconsistent description of sea level and the simplified relaxation behaviour of the ELRA approximation introduce an artificial bias on GL migration. Finally, we discuss the implications of similar time scales, on which ice dynamics and solid-Earth adjustment proceed, for the long-term stability of the ice sheet. dc:creator: Konrad, H., Sasgen, I., Klemann, V., Thoma, M., Grosfeld, K., Martinec, Z. description: We investigate the behaviour of the grounding line (GL) of an idealised ice sheet and ice shelf by coupling a thermomechanical ice-sheet model to a self-gravitating viscoelastic solid-Earth model (SGVEM) in which a gravitationally self-consistent sea-level evolution is considered. The steadystate ice-sheet ? shelf configuration is subject to forcing by sea-level rise, or altered surface mass balance and basal conditions, resulting in a retreat of the GL. We confirm previous studies showing that GL retreat can be decelerated and stopped by viscoelastic deformation of the solid Earth. We focus on the influence of lithosphere thickness and the upper mantle viscosity on the GL retreat and find that the time scales of solid-Earth relaxation, which are parameterised by the upper mantle viscosity, are most important for GL stability. We compare these retreat characteristics with results from the simpler ?elastic lithosphere ? relaxing asthenosphere? (ELRA) approximation of solid-Earth deformation, which is common in ice-sheet modelling. We find that the inconsistent description of sea level and the simplified relaxation behaviour of the ELRA approximation introduce an artificial bias on GL migration. Finally, we discuss the implications of similar time scales, on which ice dynamics and solid-Earth adjustment proceed, for the long-term stability of the ice sheet. dcterms:created: 2016-06-22T08:59:50Z Last-Modified: 2016-06-22T13:14:35Z dcterms:modified: 2016-06-22T13:14:35Z dc:format: application/pdf; version=1.6 title: Sensitivity of Grounding-Line Dynamics to Viscoelastic Deformation of the Solid-Earth in an Idealized Scenario xmpMM:DocumentID: uuid:fddb9a4b-d0d7-0d42-a718-953b4da7e8f6 Last-Save-Date: 2016-06-22T13:14:35Z pdf:docinfo:creator_tool: Prinect Printready access_permission:fill_in_form: true pdf:docinfo:modified: 2016-06-22T13:14:35Z meta:save-date: 2016-06-22T13:14:35Z pdf:encrypted: false dc:title: Sensitivity of Grounding-Line Dynamics to Viscoelastic Deformation of the Solid-Earth in an Idealized Scenario modified: 2016-06-22T13:14:35Z cp:subject: We investigate the behaviour of the grounding line (GL) of an idealised ice sheet and ice shelf by coupling a thermomechanical ice-sheet model to a self-gravitating viscoelastic solid-Earth model (SGVEM) in which a gravitationally self-consistent sea-level evolution is considered. The steadystate ice-sheet ? shelf configuration is subject to forcing by sea-level rise, or altered surface mass balance and basal conditions, resulting in a retreat of the GL. We confirm previous studies showing that GL retreat can be decelerated and stopped by viscoelastic deformation of the solid Earth. We focus on the influence of lithosphere thickness and the upper mantle viscosity on the GL retreat and find that the time scales of solid-Earth relaxation, which are parameterised by the upper mantle viscosity, are most important for GL stability. We compare these retreat characteristics with results from the simpler ?elastic lithosphere ? relaxing asthenosphere? (ELRA) approximation of solid-Earth deformation, which is common in ice-sheet modelling. We find that the inconsistent description of sea level and the simplified relaxation behaviour of the ELRA approximation introduce an artificial bias on GL migration. Finally, we discuss the implications of similar time scales, on which ice dynamics and solid-Earth adjustment proceed, for the long-term stability of the ice sheet. pdf:docinfo:subject: We investigate the behaviour of the grounding line (GL) of an idealised ice sheet and ice shelf by coupling a thermomechanical ice-sheet model to a self-gravitating viscoelastic solid-Earth model (SGVEM) in which a gravitationally self-consistent sea-level evolution is considered. The steadystate ice-sheet ? shelf configuration is subject to forcing by sea-level rise, or altered surface mass balance and basal conditions, resulting in a retreat of the GL. We confirm previous studies showing that GL retreat can be decelerated and stopped by viscoelastic deformation of the solid Earth. We focus on the influence of lithosphere thickness and the upper mantle viscosity on the GL retreat and find that the time scales of solid-Earth relaxation, which are parameterised by the upper mantle viscosity, are most important for GL stability. We compare these retreat characteristics with results from the simpler ?elastic lithosphere ? relaxing asthenosphere? (ELRA) approximation of solid-Earth deformation, which is common in ice-sheet modelling. We find that the inconsistent description of sea level and the simplified relaxation behaviour of the ELRA approximation introduce an artificial bias on GL migration. Finally, we discuss the implications of similar time scales, on which ice dynamics and solid-Earth adjustment proceed, for the long-term stability of the ice sheet. Content-Type: application/pdf pdf:docinfo:creator: Konrad, H., Sasgen, I., Klemann, V., Thoma, M., Grosfeld, K., Martinec, Z. X-Parsed-By: org.apache.tika.parser.DefaultParser creator: Konrad, H., Sasgen, I., Klemann, V., Thoma, M., Grosfeld, K., Martinec, Z. meta:author: Konrad, H., Sasgen, I., Klemann, V., Thoma, M., Grosfeld, K., Martinec, Z. meta:creation-date: 2016-06-22T08:59:50Z created: Wed Jun 22 10:59:50 CEST 2016 access_permission:extract_for_accessibility: true access_permission:assemble_document: true xmpTPg:NPages: 11 Creation-Date: 2016-06-22T08:59:50Z access_permission:extract_content: true access_permission:can_print: true Author: Konrad, H., Sasgen, I., Klemann, V., Thoma, M., Grosfeld, K., Martinec, Z. producer: Prinect Printready access_permission:can_modify: true pdf:docinfo:producer: Prinect Printready pdf:docinfo:created: 2016-06-22T08:59:50Z