Three-Dimensional Deformation Measured in an Alaskan Glacier
Measurements of movement along 28 boreholes reveal the three-dimensional flow field in a 6 million cubic meter reach of Worthington Glacier, a temperate valley glacier located in Alaska. Sliding at the bed accounted for 60 to 70 percent of the glacier's surface motion. Strain rates in the ice w...
Published in: | Science |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Association for the Advancement of Science (AAAS)
1998
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1126/science.281.5381.1340 https://www.science.org/doi/pdf/10.1126/science.281.5381.1340 |
id |
craaas:10.1126/science.281.5381.1340 |
---|---|
record_format |
openpolar |
spelling |
craaas:10.1126/science.281.5381.1340 2024-09-15T18:07:32+00:00 Three-Dimensional Deformation Measured in an Alaskan Glacier Harper, Joel T. Humphrey, Neil F. Pfeffer, W. Tad 1998 http://dx.doi.org/10.1126/science.281.5381.1340 https://www.science.org/doi/pdf/10.1126/science.281.5381.1340 en eng American Association for the Advancement of Science (AAAS) Science volume 281, issue 5381, page 1340-1342 ISSN 0036-8075 1095-9203 journal-article 1998 craaas https://doi.org/10.1126/science.281.5381.1340 2024-07-25T04:01:17Z Measurements of movement along 28 boreholes reveal the three-dimensional flow field in a 6 million cubic meter reach of Worthington Glacier, a temperate valley glacier located in Alaska. Sliding at the bed accounted for 60 to 70 percent of the glacier's surface motion. Strain rates in the ice were low from the surface to a depth of about 120 meters, but then increased rapidly toward the bed. Ice deformation was not affected by temporal changes in the sliding rate. The three-dimensional pattern of motion indicates that plane strain, which is often assumed by models, is a poor approximation of this viscous flow. Article in Journal/Newspaper glacier Alaska AAAS Resource Center (American Association for the Advancement of Science) Science 281 5381 1340 1342 |
institution |
Open Polar |
collection |
AAAS Resource Center (American Association for the Advancement of Science) |
op_collection_id |
craaas |
language |
English |
description |
Measurements of movement along 28 boreholes reveal the three-dimensional flow field in a 6 million cubic meter reach of Worthington Glacier, a temperate valley glacier located in Alaska. Sliding at the bed accounted for 60 to 70 percent of the glacier's surface motion. Strain rates in the ice were low from the surface to a depth of about 120 meters, but then increased rapidly toward the bed. Ice deformation was not affected by temporal changes in the sliding rate. The three-dimensional pattern of motion indicates that plane strain, which is often assumed by models, is a poor approximation of this viscous flow. |
format |
Article in Journal/Newspaper |
author |
Harper, Joel T. Humphrey, Neil F. Pfeffer, W. Tad |
spellingShingle |
Harper, Joel T. Humphrey, Neil F. Pfeffer, W. Tad Three-Dimensional Deformation Measured in an Alaskan Glacier |
author_facet |
Harper, Joel T. Humphrey, Neil F. Pfeffer, W. Tad |
author_sort |
Harper, Joel T. |
title |
Three-Dimensional Deformation Measured in an Alaskan Glacier |
title_short |
Three-Dimensional Deformation Measured in an Alaskan Glacier |
title_full |
Three-Dimensional Deformation Measured in an Alaskan Glacier |
title_fullStr |
Three-Dimensional Deformation Measured in an Alaskan Glacier |
title_full_unstemmed |
Three-Dimensional Deformation Measured in an Alaskan Glacier |
title_sort |
three-dimensional deformation measured in an alaskan glacier |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
1998 |
url |
http://dx.doi.org/10.1126/science.281.5381.1340 https://www.science.org/doi/pdf/10.1126/science.281.5381.1340 |
genre |
glacier Alaska |
genre_facet |
glacier Alaska |
op_source |
Science volume 281, issue 5381, page 1340-1342 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.281.5381.1340 |
container_title |
Science |
container_volume |
281 |
container_issue |
5381 |
container_start_page |
1340 |
op_container_end_page |
1342 |
_version_ |
1810444912823369728 |