The Response of the West Antarctic Ice Sheet to a Reduction of Resistive Drag Near the Grounding Line
The hypothesis that the West Antarctic ice sheet is inherently unstable because its bed is below sea level (the marine ice sheet hypothesis) is tested using a one-dimensional ice-flow model. Based on continuity and a simplification of the flow law, the model follows a flow line from the ice divide,...
Main Author: | |
---|---|
Other Authors: | |
Format: | Thesis |
Language: | English |
Published: |
The Ohio State University
1986
|
Subjects: | |
Online Access: | http://hdl.handle.net/1811/61348 |
id |
ftohiostateu:oai:kb.osu.edu:1811/61348 |
---|---|
record_format |
openpolar |
spelling |
ftohiostateu:oai:kb.osu.edu:1811/61348 2023-05-15T14:04:30+02:00 The Response of the West Antarctic Ice Sheet to a Reduction of Resistive Drag Near the Grounding Line Donnellan, Andrea Whillans, Ian M. 1986-06 application/pdf http://hdl.handle.net/1811/61348 en_US eng The Ohio State University The Ohio State University. Department of Geology and Mineralogy Honors Theses; 1986 http://hdl.handle.net/1811/61348 Thesis 1986 ftohiostateu 2020-08-22T19:37:13Z The hypothesis that the West Antarctic ice sheet is inherently unstable because its bed is below sea level (the marine ice sheet hypothesis) is tested using a one-dimensional ice-flow model. Based on continuity and a simplification of the flow law, the model follows a flow line from the ice divide, through an ice stream and into an ice shelf. Longitudinal stretching is taken to be constant with depth, and a vertically-averaged softness parameter is used. The boundary conditions are the current ice sheet, assumed to be steady, and specified longitudinal stress near the divide or calving front. Lateral flow convergence is specified and vertically-averaged velocities, longitudinal stretching stresses, driving stresses, and resistive drag (including basal drag) are calculated. Time-dependent inland ice profiles associated with a rise in sea level, are calculated by reducing the resistive drag near the grounding line. Different schemes for the redistribution of drag and resulting glacial responses are presented. Results show that local adjustments due to a reduction in resistive drag near the grounding line take on the order of 10^2 years. No embargo Thesis Antarc* Antarctic Ice Sheet Ice Shelf Ohio State University (OSU): Knowledge Bank Antarctic West Antarctic Ice Sheet |
institution |
Open Polar |
collection |
Ohio State University (OSU): Knowledge Bank |
op_collection_id |
ftohiostateu |
language |
English |
description |
The hypothesis that the West Antarctic ice sheet is inherently unstable because its bed is below sea level (the marine ice sheet hypothesis) is tested using a one-dimensional ice-flow model. Based on continuity and a simplification of the flow law, the model follows a flow line from the ice divide, through an ice stream and into an ice shelf. Longitudinal stretching is taken to be constant with depth, and a vertically-averaged softness parameter is used. The boundary conditions are the current ice sheet, assumed to be steady, and specified longitudinal stress near the divide or calving front. Lateral flow convergence is specified and vertically-averaged velocities, longitudinal stretching stresses, driving stresses, and resistive drag (including basal drag) are calculated. Time-dependent inland ice profiles associated with a rise in sea level, are calculated by reducing the resistive drag near the grounding line. Different schemes for the redistribution of drag and resulting glacial responses are presented. Results show that local adjustments due to a reduction in resistive drag near the grounding line take on the order of 10^2 years. No embargo |
author2 |
Whillans, Ian M. |
format |
Thesis |
author |
Donnellan, Andrea |
spellingShingle |
Donnellan, Andrea The Response of the West Antarctic Ice Sheet to a Reduction of Resistive Drag Near the Grounding Line |
author_facet |
Donnellan, Andrea |
author_sort |
Donnellan, Andrea |
title |
The Response of the West Antarctic Ice Sheet to a Reduction of Resistive Drag Near the Grounding Line |
title_short |
The Response of the West Antarctic Ice Sheet to a Reduction of Resistive Drag Near the Grounding Line |
title_full |
The Response of the West Antarctic Ice Sheet to a Reduction of Resistive Drag Near the Grounding Line |
title_fullStr |
The Response of the West Antarctic Ice Sheet to a Reduction of Resistive Drag Near the Grounding Line |
title_full_unstemmed |
The Response of the West Antarctic Ice Sheet to a Reduction of Resistive Drag Near the Grounding Line |
title_sort |
response of the west antarctic ice sheet to a reduction of resistive drag near the grounding line |
publisher |
The Ohio State University |
publishDate |
1986 |
url |
http://hdl.handle.net/1811/61348 |
geographic |
Antarctic West Antarctic Ice Sheet |
geographic_facet |
Antarctic West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Ice Sheet Ice Shelf |
genre_facet |
Antarc* Antarctic Ice Sheet Ice Shelf |
op_relation |
The Ohio State University. Department of Geology and Mineralogy Honors Theses; 1986 http://hdl.handle.net/1811/61348 |
_version_ |
1766275624536637440 |