Characteristics of the sticky spot of Kamb Ice Stream, West Antarctica
Amplitude analysis of reflection seismic data reveals the presence of highly variable bed conditions under the main sticky spot and adjacent regions of the Kamb Ice Stream (formerly ice stream C). The sticky spot, which is a zone of bed that imparts high basal resistance to ice flow, is situated on...
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Online Access: | https://doi.org/10.1002/2016JF004181 http://ecite.utas.edu.au/123543 |
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ftunivtasecite:oai:ecite.utas.edu.au:123543 2023-05-15T13:49:03+02:00 Characteristics of the sticky spot of Kamb Ice Stream, West Antarctica Luthra, T Peters, LE Anandakrishnan, S Alley, RB Holschuh, N Smith, AM 2017 application/pdf https://doi.org/10.1002/2016JF004181 http://ecite.utas.edu.au/123543 en eng Wiley-Blackwell Publishing Inc. http://ecite.utas.edu.au/123543/1/Luthra_et_al-2017-Journal_of_Geophysical_Research__Earth_Surface.pdf http://dx.doi.org/10.1002/2016JF004181 Luthra, T and Peters, LE and Anandakrishnan, S and Alley, RB and Holschuh, N and Smith, AM, Characteristics of the sticky spot of Kamb Ice Stream, West Antarctica, Journal of Geophysical Research: Earth Surface, 122, (3) pp. 641-653. ISSN 2169-9003 (2017) [Refereed Article] http://ecite.utas.edu.au/123543 Earth Sciences Physical Geography and Environmental Geoscience Glaciology Refereed Article PeerReviewed 2017 ftunivtasecite https://doi.org/10.1002/2016JF004181 2019-12-13T22:22:15Z Amplitude analysis of reflection seismic data reveals the presence of highly variable bed conditions under the main sticky spot and adjacent regions of the Kamb Ice Stream (formerly ice stream C). The sticky spot, which is a zone of bed that imparts high basal resistance to ice flow, is situated on a local topographic high composed of consolidated sediments or sedimentary rock. Any meltwater draining from upglacier along the base of the ice is routed around the sticky spot. The ice over the sticky spot includes, in at least some places, a seismically detectable basal layer containing a low concentration of debris, which locally thickens to 40 m over a topographic low in the bed. The ice-contact basal material ranges from dilated and highly porous to more-compacted and stiff, and perhaps locally frozen. The softer material is preferentially in topographic lows, but there is not a one-to-one correspondence between basal character and basal topography. We speculate that the 40 m thick frozen-on debris layer formed by glaciohydraulic supercooling of lake-drainage events along a basal channel during the former, active phase of the ice stream. We also speculate that loss of lubricating water, perhaps from piracy upstream, contributed to the slowdown of the ice stream, with drag from the sticky spot playing an important role, and with the basal heterogeneity greatly increasing after the slowdown of the ice stream. Article in Journal/Newspaper Antarc* Antarctica Antarctica Journal Ice Stream C Kamb Ice Stream West Antarctica eCite UTAS (University of Tasmania) West Antarctica Kamb Ice Stream ENVELOPE(-145.000,-145.000,-82.250,-82.250) Journal of Geophysical Research: Earth Surface 122 3 641 653 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology Luthra, T Peters, LE Anandakrishnan, S Alley, RB Holschuh, N Smith, AM Characteristics of the sticky spot of Kamb Ice Stream, West Antarctica |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
description |
Amplitude analysis of reflection seismic data reveals the presence of highly variable bed conditions under the main sticky spot and adjacent regions of the Kamb Ice Stream (formerly ice stream C). The sticky spot, which is a zone of bed that imparts high basal resistance to ice flow, is situated on a local topographic high composed of consolidated sediments or sedimentary rock. Any meltwater draining from upglacier along the base of the ice is routed around the sticky spot. The ice over the sticky spot includes, in at least some places, a seismically detectable basal layer containing a low concentration of debris, which locally thickens to 40 m over a topographic low in the bed. The ice-contact basal material ranges from dilated and highly porous to more-compacted and stiff, and perhaps locally frozen. The softer material is preferentially in topographic lows, but there is not a one-to-one correspondence between basal character and basal topography. We speculate that the 40 m thick frozen-on debris layer formed by glaciohydraulic supercooling of lake-drainage events along a basal channel during the former, active phase of the ice stream. We also speculate that loss of lubricating water, perhaps from piracy upstream, contributed to the slowdown of the ice stream, with drag from the sticky spot playing an important role, and with the basal heterogeneity greatly increasing after the slowdown of the ice stream. |
format |
Article in Journal/Newspaper |
author |
Luthra, T Peters, LE Anandakrishnan, S Alley, RB Holschuh, N Smith, AM |
author_facet |
Luthra, T Peters, LE Anandakrishnan, S Alley, RB Holschuh, N Smith, AM |
author_sort |
Luthra, T |
title |
Characteristics of the sticky spot of Kamb Ice Stream, West Antarctica |
title_short |
Characteristics of the sticky spot of Kamb Ice Stream, West Antarctica |
title_full |
Characteristics of the sticky spot of Kamb Ice Stream, West Antarctica |
title_fullStr |
Characteristics of the sticky spot of Kamb Ice Stream, West Antarctica |
title_full_unstemmed |
Characteristics of the sticky spot of Kamb Ice Stream, West Antarctica |
title_sort |
characteristics of the sticky spot of kamb ice stream, west antarctica |
publisher |
Wiley-Blackwell Publishing Inc. |
publishDate |
2017 |
url |
https://doi.org/10.1002/2016JF004181 http://ecite.utas.edu.au/123543 |
long_lat |
ENVELOPE(-145.000,-145.000,-82.250,-82.250) |
geographic |
West Antarctica Kamb Ice Stream |
geographic_facet |
West Antarctica Kamb Ice Stream |
genre |
Antarc* Antarctica Antarctica Journal Ice Stream C Kamb Ice Stream West Antarctica |
genre_facet |
Antarc* Antarctica Antarctica Journal Ice Stream C Kamb Ice Stream West Antarctica |
op_relation |
http://ecite.utas.edu.au/123543/1/Luthra_et_al-2017-Journal_of_Geophysical_Research__Earth_Surface.pdf http://dx.doi.org/10.1002/2016JF004181 Luthra, T and Peters, LE and Anandakrishnan, S and Alley, RB and Holschuh, N and Smith, AM, Characteristics of the sticky spot of Kamb Ice Stream, West Antarctica, Journal of Geophysical Research: Earth Surface, 122, (3) pp. 641-653. ISSN 2169-9003 (2017) [Refereed Article] http://ecite.utas.edu.au/123543 |
op_doi |
https://doi.org/10.1002/2016JF004181 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
122 |
container_issue |
3 |
container_start_page |
641 |
op_container_end_page |
653 |
_version_ |
1766250741901557760 |