Timing of stagnation of Ice Stream C, West Antarctica, from short-pulse radar studies of buried surface crevasses
Abstract Five short-pulse radar profiles were run across the edge of inactive Ice Stream C, one of the “Ross” ice streams that flows from the West Antarctic inland ice sheet into the Ross Ice Shelf. Scatter from buried crevasses, which we presume were at the surface of the ice stream when it was act...
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Cambridge University Press (CUP)
1993
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Online Access: | http://dx.doi.org/10.1017/s0022143000016440 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000016440 |
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crcambridgeupr:10.1017/s0022143000016440 2024-09-15T17:48:40+00:00 Timing of stagnation of Ice Stream C, West Antarctica, from short-pulse radar studies of buried surface crevasses Retzlaff, Rory Bentley, Charles R. 1993 http://dx.doi.org/10.1017/s0022143000016440 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000016440 en eng Cambridge University Press (CUP) Journal of Glaciology volume 39, issue 133, page 553-561 ISSN 0022-1430 1727-5652 journal-article 1993 crcambridgeupr https://doi.org/10.1017/s0022143000016440 2024-07-31T04:03:43Z Abstract Five short-pulse radar profiles were run across the edge of inactive Ice Stream C, one of the “Ross” ice streams that flows from the West Antarctic inland ice sheet into the Ross Ice Shelf. Scatter from buried crevasses, which we presume were at the surface of the ice stream when it was active, creates hyperbolae on the radar records. A density-depth curve and local accumulation rates were used to convert the picked travel times of the apices of the hyperbolae into stagnation ages for the ice stream. Stagnation ages are 130 ± 25 year for the three profiles farthest downstream and marginally less (100 ± 30 year) for the fourth. The profile farthest upstream shows a stagnation age of only ~30 year. We believe that these results indicate a “wave” of stagnation propagating at a diminishing speed upstream from the mouth of the ice stream, and we suggest that the stagnation process involves a drop in water pressure at the bed due to a conversion from sheet flow to channelized water flow. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Stream C Journal of Glaciology Ross Ice Shelf West Antarctica Cambridge University Press Journal of Glaciology 39 133 553 561 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Five short-pulse radar profiles were run across the edge of inactive Ice Stream C, one of the “Ross” ice streams that flows from the West Antarctic inland ice sheet into the Ross Ice Shelf. Scatter from buried crevasses, which we presume were at the surface of the ice stream when it was active, creates hyperbolae on the radar records. A density-depth curve and local accumulation rates were used to convert the picked travel times of the apices of the hyperbolae into stagnation ages for the ice stream. Stagnation ages are 130 ± 25 year for the three profiles farthest downstream and marginally less (100 ± 30 year) for the fourth. The profile farthest upstream shows a stagnation age of only ~30 year. We believe that these results indicate a “wave” of stagnation propagating at a diminishing speed upstream from the mouth of the ice stream, and we suggest that the stagnation process involves a drop in water pressure at the bed due to a conversion from sheet flow to channelized water flow. |
format |
Article in Journal/Newspaper |
author |
Retzlaff, Rory Bentley, Charles R. |
spellingShingle |
Retzlaff, Rory Bentley, Charles R. Timing of stagnation of Ice Stream C, West Antarctica, from short-pulse radar studies of buried surface crevasses |
author_facet |
Retzlaff, Rory Bentley, Charles R. |
author_sort |
Retzlaff, Rory |
title |
Timing of stagnation of Ice Stream C, West Antarctica, from short-pulse radar studies of buried surface crevasses |
title_short |
Timing of stagnation of Ice Stream C, West Antarctica, from short-pulse radar studies of buried surface crevasses |
title_full |
Timing of stagnation of Ice Stream C, West Antarctica, from short-pulse radar studies of buried surface crevasses |
title_fullStr |
Timing of stagnation of Ice Stream C, West Antarctica, from short-pulse radar studies of buried surface crevasses |
title_full_unstemmed |
Timing of stagnation of Ice Stream C, West Antarctica, from short-pulse radar studies of buried surface crevasses |
title_sort |
timing of stagnation of ice stream c, west antarctica, from short-pulse radar studies of buried surface crevasses |
publisher |
Cambridge University Press (CUP) |
publishDate |
1993 |
url |
http://dx.doi.org/10.1017/s0022143000016440 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000016440 |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Stream C Journal of Glaciology Ross Ice Shelf West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Stream C Journal of Glaciology Ross Ice Shelf West Antarctica |
op_source |
Journal of Glaciology volume 39, issue 133, page 553-561 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000016440 |
container_title |
Journal of Glaciology |
container_volume |
39 |
container_issue |
133 |
container_start_page |
553 |
op_container_end_page |
561 |
_version_ |
1810290149156716544 |