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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Format: | Article in Journal/Newspaper |
Language: | English |
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American Geophysical Union
2017
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Online Access: | http://nora.nerc.ac.uk/id/eprint/518934/ https://nora.nerc.ac.uk/id/eprint/518934/1/Kyrke-Smith_et_al-2017-Journal_of_Geophysical_Research__Earth_Surface.pdf https://doi.org/10.1002/2017JF004373 |
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ftnerc:oai:nora.nerc.ac.uk:518934 2023-05-15T16:40:24+02:00 Can Seismic Observations of Bed Conditions on Ice Streams Help Constrain Parameters in Ice Flow Models? Kyrke-Smith, Teresa M. Gudmundsson, G. Hilmar Farrell, Patrick E. 2017-11 text http://nora.nerc.ac.uk/id/eprint/518934/ https://nora.nerc.ac.uk/id/eprint/518934/1/Kyrke-Smith_et_al-2017-Journal_of_Geophysical_Research__Earth_Surface.pdf https://doi.org/10.1002/2017JF004373 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/518934/1/Kyrke-Smith_et_al-2017-Journal_of_Geophysical_Research__Earth_Surface.pdf Kyrke-Smith, Teresa M.; Gudmundsson, G. Hilmar orcid:0000-0003-4236-5369 Farrell, Patrick E. 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). 2269-2282. https://doi.org/10.1002/2017JF004373 <https://doi.org/10.1002/2017JF004373> Publication - Article PeerReviewed 2017 ftnerc https://doi.org/10.1002/2017JF004373 2023-02-04T19:45:55Z 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 Natural Environment Research Council: NERC Open Research Archive 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 |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
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 M. Gudmundsson, G. Hilmar Farrell, Patrick E. |
spellingShingle |
Kyrke-Smith, Teresa M. Gudmundsson, G. Hilmar Farrell, Patrick E. Can Seismic Observations of Bed Conditions on Ice Streams Help Constrain Parameters in Ice Flow Models? |
author_facet |
Kyrke-Smith, Teresa M. Gudmundsson, G. Hilmar Farrell, Patrick E. |
author_sort |
Kyrke-Smith, Teresa M. |
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 |
American Geophysical Union |
publishDate |
2017 |
url |
http://nora.nerc.ac.uk/id/eprint/518934/ https://nora.nerc.ac.uk/id/eprint/518934/1/Kyrke-Smith_et_al-2017-Journal_of_Geophysical_Research__Earth_Surface.pdf 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 |
https://nora.nerc.ac.uk/id/eprint/518934/1/Kyrke-Smith_et_al-2017-Journal_of_Geophysical_Research__Earth_Surface.pdf Kyrke-Smith, Teresa M.; Gudmundsson, G. Hilmar orcid:0000-0003-4236-5369 Farrell, Patrick E. 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). 2269-2282. https://doi.org/10.1002/2017JF004373 <https://doi.org/10.1002/2017JF004373> |
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_ |
1766030803482968064 |