Can Seismic Observations of Bed Conditions on Ice Streams Help Constrain Parameters in Ice Flow Models?
We investigate correlations between seismically derived estimates of basal acoustic impedance and basal slipperiness values obtained from a surface‐to‐bed inversion using a Stokes ice flow model. Using high‐resolution measurements along several seismic profiles on Pine Island Glacier (PIG), we find...
Published in: | Journal of Geophysical Research: Earth Surface |
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2017
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/34588/ https://doi.org/10.1002/2017JF004373 |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:34588 2023-05-15T16:40:28+02:00 Can Seismic Observations of Bed Conditions on Ice Streams Help Constrain Parameters in Ice Flow Models? Kyrke-Smith, Teresa Gudmundsson, Hilmar Farrell, Patrick 2017-11-01 https://nrl.northumbria.ac.uk/id/eprint/34588/ https://doi.org/10.1002/2017JF004373 unknown Wiley-Blackwell Kyrke-Smith, Teresa, Gudmundsson, Hilmar and Farrell, Patrick (2017) Can Seismic Observations of Bed Conditions on Ice Streams Help Constrain Parameters in Ice Flow Models? Journal of Geophysical Research: Earth Surface, 122 (11). pp. 2269-2282. ISSN 2169-9003 F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2017 ftunivnorthumb https://doi.org/10.1002/2017JF004373 2022-09-25T06:07:25Z We investigate correlations between seismically derived estimates of basal acoustic impedance and basal slipperiness values obtained from a surface‐to‐bed inversion using a Stokes ice flow model. Using high‐resolution measurements along several seismic profiles on Pine Island Glacier (PIG), we find no significant correlation at kilometer scale between acoustic impedance and either retrieved basal slipperiness or basal drag. However, there is a stronger correlation when comparing average values along the individual profiles. We hypothesize that the correlation appears at the length scales over which basal variations are important to large‐scale ice sheet flow. Although the seismic technique is sensitive to the material properties of the bed, at present there is no clear way of incorporating high‐resolution seismic measurements of bed properties on ice streams into ice flow models. We conclude that more theoretical work needs to be done before constraints on mechanical conditions at the ice‐bed interface from acoustic impedance measurements can be of direct use to ice sheet models. Article in Journal/Newspaper Ice Sheet Pine Island Glacier Northumbria University, Newcastle: Northumbria Research Link (NRL) Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) Journal of Geophysical Research: Earth Surface 122 11 2269 2282 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
unknown |
topic |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
spellingShingle |
F800 Physical and Terrestrial Geographical and Environmental Sciences Kyrke-Smith, Teresa Gudmundsson, Hilmar Farrell, Patrick Can Seismic Observations of Bed Conditions on Ice Streams Help Constrain Parameters in Ice Flow Models? |
topic_facet |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
description |
We investigate correlations between seismically derived estimates of basal acoustic impedance and basal slipperiness values obtained from a surface‐to‐bed inversion using a Stokes ice flow model. Using high‐resolution measurements along several seismic profiles on Pine Island Glacier (PIG), we find no significant correlation at kilometer scale between acoustic impedance and either retrieved basal slipperiness or basal drag. However, there is a stronger correlation when comparing average values along the individual profiles. We hypothesize that the correlation appears at the length scales over which basal variations are important to large‐scale ice sheet flow. Although the seismic technique is sensitive to the material properties of the bed, at present there is no clear way of incorporating high‐resolution seismic measurements of bed properties on ice streams into ice flow models. We conclude that more theoretical work needs to be done before constraints on mechanical conditions at the ice‐bed interface from acoustic impedance measurements can be of direct use to ice sheet models. |
format |
Article in Journal/Newspaper |
author |
Kyrke-Smith, Teresa Gudmundsson, Hilmar Farrell, Patrick |
author_facet |
Kyrke-Smith, Teresa Gudmundsson, Hilmar Farrell, Patrick |
author_sort |
Kyrke-Smith, Teresa |
title |
Can Seismic Observations of Bed Conditions on Ice Streams Help Constrain Parameters in Ice Flow Models? |
title_short |
Can Seismic Observations of Bed Conditions on Ice Streams Help Constrain Parameters in Ice Flow Models? |
title_full |
Can Seismic Observations of Bed Conditions on Ice Streams Help Constrain Parameters in Ice Flow Models? |
title_fullStr |
Can Seismic Observations of Bed Conditions on Ice Streams Help Constrain Parameters in Ice Flow Models? |
title_full_unstemmed |
Can Seismic Observations of Bed Conditions on Ice Streams Help Constrain Parameters in Ice Flow Models? |
title_sort |
can seismic observations of bed conditions on ice streams help constrain parameters in ice flow models? |
publisher |
Wiley-Blackwell |
publishDate |
2017 |
url |
https://nrl.northumbria.ac.uk/id/eprint/34588/ https://doi.org/10.1002/2017JF004373 |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
geographic |
Pine Island Glacier |
geographic_facet |
Pine Island Glacier |
genre |
Ice Sheet Pine Island Glacier |
genre_facet |
Ice Sheet Pine Island Glacier |
op_relation |
Kyrke-Smith, Teresa, Gudmundsson, Hilmar and Farrell, Patrick (2017) Can Seismic Observations of Bed Conditions on Ice Streams Help Constrain Parameters in Ice Flow Models? Journal of Geophysical Research: Earth Surface, 122 (11). pp. 2269-2282. ISSN 2169-9003 |
op_doi |
https://doi.org/10.1002/2017JF004373 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
122 |
container_issue |
11 |
container_start_page |
2269 |
op_container_end_page |
2282 |
_version_ |
1766030866575785984 |