Variations in Time and Space of the Velocity of Lower Columbia Glacier, Alaska
Abstract Ice velocity, acceleration, and strain-rate are being measured at intervals of about 45 d using automated processing of aerial photographs. Preliminary results for the lowest 6 km of Columbia Glacier for the period July 1976 to November 1977 show the following: (1) High rates of flow (2–6 m...
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Cambridge University Press (CUP)
1979
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Online Access: | http://dx.doi.org/10.1017/s0022143000030057 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000030057 |
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crcambridgeupr:10.1017/s0022143000030057 2024-04-07T07:52:35+00:00 Variations in Time and Space of the Velocity of Lower Columbia Glacier, Alaska Meier, Mark F. 1979 http://dx.doi.org/10.1017/s0022143000030057 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000030057 en eng Cambridge University Press (CUP) Journal of Glaciology volume 23, issue 89, page 408 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1979 crcambridgeupr https://doi.org/10.1017/s0022143000030057 2024-03-08T00:30:18Z Abstract Ice velocity, acceleration, and strain-rate are being measured at intervals of about 45 d using automated processing of aerial photographs. Preliminary results for the lowest 6 km of Columbia Glacier for the period July 1976 to November 1977 show the following: (1) High rates of flow (2–6 m/d) and longitudinal extension (occasionally exceeding 1/a). (2) A smooth, almost sinusoidal change in velocity 6 km above the terminus from about 2 m/d in August 1976 and 1977 to about 3 m/d in February–March 1977. (3) Very rapid increases in velocity near the terminus in October 1976 and September–October 1977 which follow embayment formation (increased iceberg calving). (4) A suggestion that the rapid velocity increases propagate up-glacier for 3–4 km before becoming unrecognizable. (5) Seasonal changes in velocity (which presumably relate to basal sliding) ranging from about 1 m/d 6 km above the terminus to about 4 m/d near the terminus. Article in Journal/Newspaper glacier Journal of Glaciology Alaska Cambridge University Press Journal of Glaciology 23 89 408 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Meier, Mark F. Variations in Time and Space of the Velocity of Lower Columbia Glacier, Alaska |
topic_facet |
Earth-Surface Processes |
description |
Abstract Ice velocity, acceleration, and strain-rate are being measured at intervals of about 45 d using automated processing of aerial photographs. Preliminary results for the lowest 6 km of Columbia Glacier for the period July 1976 to November 1977 show the following: (1) High rates of flow (2–6 m/d) and longitudinal extension (occasionally exceeding 1/a). (2) A smooth, almost sinusoidal change in velocity 6 km above the terminus from about 2 m/d in August 1976 and 1977 to about 3 m/d in February–March 1977. (3) Very rapid increases in velocity near the terminus in October 1976 and September–October 1977 which follow embayment formation (increased iceberg calving). (4) A suggestion that the rapid velocity increases propagate up-glacier for 3–4 km before becoming unrecognizable. (5) Seasonal changes in velocity (which presumably relate to basal sliding) ranging from about 1 m/d 6 km above the terminus to about 4 m/d near the terminus. |
format |
Article in Journal/Newspaper |
author |
Meier, Mark F. |
author_facet |
Meier, Mark F. |
author_sort |
Meier, Mark F. |
title |
Variations in Time and Space of the Velocity of Lower Columbia Glacier, Alaska |
title_short |
Variations in Time and Space of the Velocity of Lower Columbia Glacier, Alaska |
title_full |
Variations in Time and Space of the Velocity of Lower Columbia Glacier, Alaska |
title_fullStr |
Variations in Time and Space of the Velocity of Lower Columbia Glacier, Alaska |
title_full_unstemmed |
Variations in Time and Space of the Velocity of Lower Columbia Glacier, Alaska |
title_sort |
variations in time and space of the velocity of lower columbia glacier, alaska |
publisher |
Cambridge University Press (CUP) |
publishDate |
1979 |
url |
http://dx.doi.org/10.1017/s0022143000030057 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000030057 |
genre |
glacier Journal of Glaciology Alaska |
genre_facet |
glacier Journal of Glaciology Alaska |
op_source |
Journal of Glaciology volume 23, issue 89, page 408 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000030057 |
container_title |
Journal of Glaciology |
container_volume |
23 |
container_issue |
89 |
container_start_page |
408 |
_version_ |
1795667996986834944 |