Quiescent-phase evolution of a surge-type glacier: Black Rapids Glacier, Alaska, U.S.A.
Abstract Black Rapids Glacier, a surge-type glacier in the Alaska Range, most recently surged in 1936–37 and is currently in its quiescent phase. Mass balance, ice velocity and thickness change have been measured at three to ten sites from 1972 to 1994. The annual speed has undergone cyclical fluctu...
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Cambridge University Press (CUP)
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crcambridgeupr:10.1017/s0022143000030574 2024-03-03T08:36:17+00:00 Quiescent-phase evolution of a surge-type glacier: Black Rapids Glacier, Alaska, U.S.A. Heinrichs, T.A. Mayo, L.R. Echelmeyer, K.A. Harrison, W.D. 1996 http://dx.doi.org/10.1017/s0022143000030574 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000030574 en eng Cambridge University Press (CUP) Journal of Glaciology volume 42, issue 140, page 110-122 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1996 crcambridgeupr https://doi.org/10.1017/s0022143000030574 2024-02-08T08:37:11Z Abstract Black Rapids Glacier, a surge-type glacier in the Alaska Range, most recently surged in 1936–37 and is currently in its quiescent phase. Mass balance, ice velocity and thickness change have been measured at three to ten sites from 1972 to 1994. The annual speed has undergone cyclical fluctuations of as much as 45% about the mean speed. Ice thickness and surface slope did not change enough to cause the speed fluctuations through changes in ice deformation, which indicates that they are being drinven by changes in basal motion. The behavior of Black Rapids Glacier during this quiescent phase is significantly different from that of Variegated Glacier, another well-studied surge-type glacier in Alaska. The present medial-moraine configuration of Black Rapids Glacier indicates that a surge could occur at any time. However, ice velocity data indicate that the next surge may not be imminent. We belive that there is little chance that the next surge will cross and dam the Delta River. Article in Journal/Newspaper alaska range glacier Journal of Glaciology Alaska Cambridge University Press Delta River ENVELOPE(-103.371,-103.371,78.769,78.769) Journal of Glaciology 42 140 110 122 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Heinrichs, T.A. Mayo, L.R. Echelmeyer, K.A. Harrison, W.D. Quiescent-phase evolution of a surge-type glacier: Black Rapids Glacier, Alaska, U.S.A. |
topic_facet |
Earth-Surface Processes |
description |
Abstract Black Rapids Glacier, a surge-type glacier in the Alaska Range, most recently surged in 1936–37 and is currently in its quiescent phase. Mass balance, ice velocity and thickness change have been measured at three to ten sites from 1972 to 1994. The annual speed has undergone cyclical fluctuations of as much as 45% about the mean speed. Ice thickness and surface slope did not change enough to cause the speed fluctuations through changes in ice deformation, which indicates that they are being drinven by changes in basal motion. The behavior of Black Rapids Glacier during this quiescent phase is significantly different from that of Variegated Glacier, another well-studied surge-type glacier in Alaska. The present medial-moraine configuration of Black Rapids Glacier indicates that a surge could occur at any time. However, ice velocity data indicate that the next surge may not be imminent. We belive that there is little chance that the next surge will cross and dam the Delta River. |
format |
Article in Journal/Newspaper |
author |
Heinrichs, T.A. Mayo, L.R. Echelmeyer, K.A. Harrison, W.D. |
author_facet |
Heinrichs, T.A. Mayo, L.R. Echelmeyer, K.A. Harrison, W.D. |
author_sort |
Heinrichs, T.A. |
title |
Quiescent-phase evolution of a surge-type glacier: Black Rapids Glacier, Alaska, U.S.A. |
title_short |
Quiescent-phase evolution of a surge-type glacier: Black Rapids Glacier, Alaska, U.S.A. |
title_full |
Quiescent-phase evolution of a surge-type glacier: Black Rapids Glacier, Alaska, U.S.A. |
title_fullStr |
Quiescent-phase evolution of a surge-type glacier: Black Rapids Glacier, Alaska, U.S.A. |
title_full_unstemmed |
Quiescent-phase evolution of a surge-type glacier: Black Rapids Glacier, Alaska, U.S.A. |
title_sort |
quiescent-phase evolution of a surge-type glacier: black rapids glacier, alaska, u.s.a. |
publisher |
Cambridge University Press (CUP) |
publishDate |
1996 |
url |
http://dx.doi.org/10.1017/s0022143000030574 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000030574 |
long_lat |
ENVELOPE(-103.371,-103.371,78.769,78.769) |
geographic |
Delta River |
geographic_facet |
Delta River |
genre |
alaska range glacier Journal of Glaciology Alaska |
genre_facet |
alaska range glacier Journal of Glaciology Alaska |
op_source |
Journal of Glaciology volume 42, issue 140, page 110-122 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000030574 |
container_title |
Journal of Glaciology |
container_volume |
42 |
container_issue |
140 |
container_start_page |
110 |
op_container_end_page |
122 |
_version_ |
1792498485968240640 |