Glacier surge propagation by thermal evolution at the bed
Sherpa Romeo green journal. Permission to archive final published version. Bakaninbreen, southern Svalbard, began a prolonged surge during 1985. In 1986, an internal reflecting horizon on radio echo sounding data was interpreted to show that the position of the surge front coincided with a transitio...
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ftunivlethb:oai:opus.uleth.ca:10133/5594 2023-05-15T16:22:12+02:00 Glacier surge propagation by thermal evolution at the bed Murray, Tavi Stuart, Graham W. Miller, Paul J. Woodward, John Smith, Andrew M. Porter, Philip R. Jiskoot, Hester 2000 application/pdf https://hdl.handle.net/10133/5594 en_US eng American Geophysical Union Arts and Science Department of Geography University of Leeds Natural Environmental Research Council (U.K.) University of Lethbridge https://dx.doi.org/10.1029/2000JB900066 Murray, T., Stuart, G. W., Miller, P. J., Woodward, J., Smith, A. J., Porter, P. R., & Jiskoot, H. (2000). Glacier surge propagation by thermal evolution at the bed. Journal of Geophysical Research Solid Earth, 105(B6), 13, 491-13, 507. https://hdl.handle.net/10133/5594 Article 2000 ftunivlethb 2021-06-27T07:20:23Z Sherpa Romeo green journal. Permission to archive final published version. Bakaninbreen, southern Svalbard, began a prolonged surge during 1985. In 1986, an internal reflecting horizon on radio echo sounding data was interpreted to show that the position of the surge front coincided with a transition between areas of warm (unfrozen) and cold (frozen) bed. Ground-penetrating radar lines run in 1996 and 1998 during early quiescence show that the basal region of the glacier is characterized by a strong reflection, interpreted as the top of a thick layer of sediment-rich basal ice. Down glacier of the present surge front, features imaged beneath the basal reflection are interpreted as the bottom of the basal ice layer, the base of a permafrost layer, and local ice lenses. This indicates that this region of the bed is cold. Up glacier of the surge front, a scattering zone above the basal reflection is interpreted as warm ice. There is no evidence for this warm zone down glacier of the surge front, nor do we see basal permafrost up glacier of it. Thus, as in early surge phase, the location of the surge front is now at the transition between warm and cold ice at the glacier bed. We suggest that the propagation of the front is associated with this basal thermal transition throughout the surge. Because propagation of the front occurs rapidly and generates only limited heat, basal motion during fast flow must have been restricted to a thin layer at the bed and occurred by sliding or deformation localized at the ice-bed interface. Yes Article in Journal/Newspaper glacier Ice permafrost Svalbard University of Lethbridge Institutional Repository Bakaninbreen ENVELOPE(17.500,17.500,77.667,77.667) Romeo ENVELOPE(-59.927,-59.927,-62.376,-62.376) Svalbard |
institution |
Open Polar |
collection |
University of Lethbridge Institutional Repository |
op_collection_id |
ftunivlethb |
language |
English |
description |
Sherpa Romeo green journal. Permission to archive final published version. Bakaninbreen, southern Svalbard, began a prolonged surge during 1985. In 1986, an internal reflecting horizon on radio echo sounding data was interpreted to show that the position of the surge front coincided with a transition between areas of warm (unfrozen) and cold (frozen) bed. Ground-penetrating radar lines run in 1996 and 1998 during early quiescence show that the basal region of the glacier is characterized by a strong reflection, interpreted as the top of a thick layer of sediment-rich basal ice. Down glacier of the present surge front, features imaged beneath the basal reflection are interpreted as the bottom of the basal ice layer, the base of a permafrost layer, and local ice lenses. This indicates that this region of the bed is cold. Up glacier of the surge front, a scattering zone above the basal reflection is interpreted as warm ice. There is no evidence for this warm zone down glacier of the surge front, nor do we see basal permafrost up glacier of it. Thus, as in early surge phase, the location of the surge front is now at the transition between warm and cold ice at the glacier bed. We suggest that the propagation of the front is associated with this basal thermal transition throughout the surge. Because propagation of the front occurs rapidly and generates only limited heat, basal motion during fast flow must have been restricted to a thin layer at the bed and occurred by sliding or deformation localized at the ice-bed interface. Yes |
format |
Article in Journal/Newspaper |
author |
Murray, Tavi Stuart, Graham W. Miller, Paul J. Woodward, John Smith, Andrew M. Porter, Philip R. Jiskoot, Hester |
spellingShingle |
Murray, Tavi Stuart, Graham W. Miller, Paul J. Woodward, John Smith, Andrew M. Porter, Philip R. Jiskoot, Hester Glacier surge propagation by thermal evolution at the bed |
author_facet |
Murray, Tavi Stuart, Graham W. Miller, Paul J. Woodward, John Smith, Andrew M. Porter, Philip R. Jiskoot, Hester |
author_sort |
Murray, Tavi |
title |
Glacier surge propagation by thermal evolution at the bed |
title_short |
Glacier surge propagation by thermal evolution at the bed |
title_full |
Glacier surge propagation by thermal evolution at the bed |
title_fullStr |
Glacier surge propagation by thermal evolution at the bed |
title_full_unstemmed |
Glacier surge propagation by thermal evolution at the bed |
title_sort |
glacier surge propagation by thermal evolution at the bed |
publisher |
American Geophysical Union |
publishDate |
2000 |
url |
https://hdl.handle.net/10133/5594 |
long_lat |
ENVELOPE(17.500,17.500,77.667,77.667) ENVELOPE(-59.927,-59.927,-62.376,-62.376) |
geographic |
Bakaninbreen Romeo Svalbard |
geographic_facet |
Bakaninbreen Romeo Svalbard |
genre |
glacier Ice permafrost Svalbard |
genre_facet |
glacier Ice permafrost Svalbard |
op_relation |
Murray, T., Stuart, G. W., Miller, P. J., Woodward, J., Smith, A. J., Porter, P. R., & Jiskoot, H. (2000). Glacier surge propagation by thermal evolution at the bed. Journal of Geophysical Research Solid Earth, 105(B6), 13, 491-13, 507. https://hdl.handle.net/10133/5594 |
_version_ |
1766010174728830976 |