Show simple item record Smith, A. M. Murray, Tavi Davison, B. M. Clough, A. F. Woodward, J. Jiskoot, Hester 2019-11-26T22:41:22Z 2019-11-26T22:41:22Z 2002
dc.identifier.citation Smith, A. M., Murray, T., Davison, B. M., Clough, A. F., Woodward, J., & Jiskoot, H. (2002). Late surge glacial conditions on Bakaninbreen, Svalbard, and implications for surge termination. Journal of Geophysical Research, 107(B8), 2152. doi: 10.1029/2001JB000475 en_US
dc.description Sherpa Romeo green journal. Permission to archive final published version en_US
dc.description.abstract Bakaninbreen is a polythermal glacier in southern Spitsbergen, Svalbard, that last surged between 1985 and 1995. Seismic reflection data were acquired during early quiescence in spring 1998, just upstream of the surge front. The results were combined with complementary ground-penetrating radar data to investigate the glacial structure and basal conditions. We find no difference between the ice thickness values determined from the seismic and radar methods, suggesting that any layer of basal ice cannot be greater than 5 m thick. Interpretation of the amplitude of the seismic reflections indicates the presence of permafrost close to the glacier base. A thin layer of thawed deforming sediment separates the glacier from this underlying permafrost. In an area just upstream of the surge front the permafrost becomes discontinuous and may even be absent, the ice being underlain by 10–15 m of thawed sediments overlying deeper bedrock. Highpressure water is believed to have been required to maintain the propagation of the surge, and this area of thawed sediment is interpreted as a route for that water to escape from the basal system. When the surge front passed over this thawed bed, the escaping water reduced the pressure in the subglacial hydraulic system, initiating the termination of the surge. Surge termination was therefore primarily controlled by the presurge permafrost distribution beneath the glacier, rather than any feature of the surge itself. This termination mechanism is probably limited to surges in polythermal glaciers, but the techniques used may have wider glaciological applications. en_US
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.subject Seismic en_US
dc.subject GPR en_US
dc.subject Glacier en_US
dc.subject Surge en_US
dc.subject Permafrost en_US
dc.subject Arctic en_US
dc.title Late surge glacial conditions on Bakaninbreen, Svalbard, and implications for surge termination en_US
dc.type Article en_US
dc.publisher.faculty Arts and Science en_US
dc.publisher.department Department of Geography en_US
dc.description.peer-review Yes en_US
dc.publisher.institution Natural Environmental Research Council (U.K.) en_US
dc.publisher.institution University of Leeds en_US
dc.publisher.institution Lancaster University en_US
dc.publisher.institution Brunel University en_US
dc.publisher.institution University of Calgary en_US
dc.publisher.institution University of Lethbridge en_US

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