Variations in basal conditions on Rutford Ice Stream, West Antarctica
Abstract Seismic reflection data from two lines on Rutford Ice Streem are presented and are compared with data already published from a third line on the ice stream. The amplitude and phase of the reflections have been used io investigate the properties ol the sub-ice material. Multiple reflections...
Published in: | Journal of Glaciology |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
1997
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0022143000003191 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003191 |
id |
crcambridgeupr:10.1017/s0022143000003191 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s0022143000003191 2024-03-03T08:38:24+00:00 Variations in basal conditions on Rutford Ice Stream, West Antarctica Smith, A. M. 1997 http://dx.doi.org/10.1017/s0022143000003191 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003191 en eng Cambridge University Press (CUP) Journal of Glaciology volume 43, issue 144, page 245-255 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1997 crcambridgeupr https://doi.org/10.1017/s0022143000003191 2024-02-08T08:47:47Z Abstract Seismic reflection data from two lines on Rutford Ice Streem are presented and are compared with data already published from a third line on the ice stream. The amplitude and phase of the reflections have been used io investigate the properties ol the sub-ice material. Multiple reflections on long record-length data allowed calibration of the reflection coefficient at the ice-bed interlace and determination of the acoustic impedance of the bed material. The characteristics of the bed material vary both along and across the ice stream. The average acoustic impedance of the bed material across the glacier at the upstream line is 3.88 x 10 6 kg −2 s −1 . This decreases to 3.19 x 10 −6 kg m −2 s −1 52 km further downstream. These values are within the rang which is typical of soft sediments. Using acoustic impedance as an indicator of subgiacial porosity, some areas of the ice-stream bed are interpreted as dilatant water-saturated sediments undergoing pervasive deformation. In other areas, the bed is not deforming and basal sliding may be a more important process. The proportional the ice-stream width over which bed deformation occurs increases downstream. Article in Journal/Newspaper Antarc* Antarctica Journal of Glaciology Rutford Ice Stream West Antarctica Cambridge University Press West Antarctica Rutford ENVELOPE(-85.300,-85.300,-78.600,-78.600) Rutford Ice Stream ENVELOPE(-80.000,-80.000,-79.167,-79.167) Journal of Glaciology 43 144 245 255 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Smith, A. M. Variations in basal conditions on Rutford Ice Stream, West Antarctica |
topic_facet |
Earth-Surface Processes |
description |
Abstract Seismic reflection data from two lines on Rutford Ice Streem are presented and are compared with data already published from a third line on the ice stream. The amplitude and phase of the reflections have been used io investigate the properties ol the sub-ice material. Multiple reflections on long record-length data allowed calibration of the reflection coefficient at the ice-bed interlace and determination of the acoustic impedance of the bed material. The characteristics of the bed material vary both along and across the ice stream. The average acoustic impedance of the bed material across the glacier at the upstream line is 3.88 x 10 6 kg −2 s −1 . This decreases to 3.19 x 10 −6 kg m −2 s −1 52 km further downstream. These values are within the rang which is typical of soft sediments. Using acoustic impedance as an indicator of subgiacial porosity, some areas of the ice-stream bed are interpreted as dilatant water-saturated sediments undergoing pervasive deformation. In other areas, the bed is not deforming and basal sliding may be a more important process. The proportional the ice-stream width over which bed deformation occurs increases downstream. |
format |
Article in Journal/Newspaper |
author |
Smith, A. M. |
author_facet |
Smith, A. M. |
author_sort |
Smith, A. M. |
title |
Variations in basal conditions on Rutford Ice Stream, West Antarctica |
title_short |
Variations in basal conditions on Rutford Ice Stream, West Antarctica |
title_full |
Variations in basal conditions on Rutford Ice Stream, West Antarctica |
title_fullStr |
Variations in basal conditions on Rutford Ice Stream, West Antarctica |
title_full_unstemmed |
Variations in basal conditions on Rutford Ice Stream, West Antarctica |
title_sort |
variations in basal conditions on rutford ice stream, west antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1997 |
url |
http://dx.doi.org/10.1017/s0022143000003191 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003191 |
long_lat |
ENVELOPE(-85.300,-85.300,-78.600,-78.600) ENVELOPE(-80.000,-80.000,-79.167,-79.167) |
geographic |
West Antarctica Rutford Rutford Ice Stream |
geographic_facet |
West Antarctica Rutford Rutford Ice Stream |
genre |
Antarc* Antarctica Journal of Glaciology Rutford Ice Stream West Antarctica |
genre_facet |
Antarc* Antarctica Journal of Glaciology Rutford Ice Stream West Antarctica |
op_source |
Journal of Glaciology volume 43, issue 144, page 245-255 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000003191 |
container_title |
Journal of Glaciology |
container_volume |
43 |
container_issue |
144 |
container_start_page |
245 |
op_container_end_page |
255 |
_version_ |
1792506781334765568 |