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 n...
Published in: | Journal of Geophysical Research: Earth Surface |
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American Geophysical Union
2017
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Online Access: | https://doi.org/10.1002/2017JF004373 https://ora.ox.ac.uk/objects/uuid:a300f261-c752-49e4-87ac-5b180e0a962e |
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ftuloxford:oai:ora.ox.ac.uk:uuid:a300f261-c752-49e4-87ac-5b180e0a962e 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, T Gudmundsson, G Farrell, P 2017-10-23 https://doi.org/10.1002/2017JF004373 https://ora.ox.ac.uk/objects/uuid:a300f261-c752-49e4-87ac-5b180e0a962e unknown American Geophysical Union doi:10.1002/2017JF004373 https://ora.ox.ac.uk/objects/uuid:a300f261-c752-49e4-87ac-5b180e0a962e https://doi.org/10.1002/2017JF004373 info:eu-repo/semantics/openAccess Journal article 2017 ftuloxford https://doi.org/10.1002/2017JF004373 2022-06-28T20:20:02Z 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 kilometre 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 hypothesise that the correlation appears at the lengthscales 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 ORA - Oxford University 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 |
ORA - Oxford University Research Archive |
op_collection_id |
ftuloxford |
language |
unknown |
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 kilometre 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 hypothesise that the correlation appears at the lengthscales 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, T Gudmundsson, G Farrell, P |
spellingShingle |
Kyrke-Smith, T Gudmundsson, G Farrell, P Can seismic observations of bed conditions on ice streams help constrain parameters in ice flow models? |
author_facet |
Kyrke-Smith, T Gudmundsson, G Farrell, P |
author_sort |
Kyrke-Smith, T |
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 |
https://doi.org/10.1002/2017JF004373 https://ora.ox.ac.uk/objects/uuid:a300f261-c752-49e4-87ac-5b180e0a962e |
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 |
doi:10.1002/2017JF004373 https://ora.ox.ac.uk/objects/uuid:a300f261-c752-49e4-87ac-5b180e0a962e https://doi.org/10.1002/2017JF004373 |
op_rights |
info:eu-repo/semantics/openAccess |
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_ |
1766030803139035136 |