Subglacial sediments as a control on the onset and location of two Siple Coast ice streams, West Antarctica
Laterally continuous subglacial sediments are a necessary component for ice streaming in the modern onset regions of the ice streams draining the Siple Coast of West Antarctica on the basis of new seismic data combined with previous results. We present geophysical results from seismic reflection and...
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ftunivtasecite:oai:ecite.utas.edu.au:103895 2023-05-15T14:03:25+02:00 Subglacial sediments as a control on the onset and location of two Siple Coast ice streams, West Antarctica Peters, LE Anandakrishnan, S Alley, RB Winberry, JP Voigt, DE Smith, AM Morse, DL 2006 application/pdf https://doi.org/10.1029/2005JB003766 http://ecite.utas.edu.au/103895 en eng Amer Geophysical Union http://ecite.utas.edu.au/103895/1/Peters_et_al_[2006_JGR].pdf http://dx.doi.org/10.1029/2005JB003766 Peters, LE and Anandakrishnan, S and Alley, RB and Winberry, JP and Voigt, DE and Smith, AM and Morse, DL, Subglacial sediments as a control on the onset and location of two Siple Coast ice streams, West Antarctica, Journal of Geophysical Research, 111, (B1) Article B01302. ISSN 0148-0227 (2006) [Refereed Article] http://ecite.utas.edu.au/103895 Earth Sciences Physical Geography and Environmental Geoscience Glaciology Refereed Article PeerReviewed 2006 ftunivtasecite https://doi.org/10.1029/2005JB003766 2019-12-13T22:05:19Z Laterally continuous subglacial sediments are a necessary component for ice streaming in the modern onset regions of the ice streams draining the Siple Coast of West Antarctica on the basis of new seismic data combined with previous results. We present geophysical results from seismic reflection and refraction experiments in the upper reaches of ice streams C and D that highlight continuous sedimentary basins within and upstream of the current onset regions of both ice streams, with streaming ice overlying these sedimentary packages. The subglacial environment changes from no-sediment to discontinuous-sediment to continuous-sediment cover along a longitudinal profile from the ice sheet to tributary C1B. Along this same profile, we observe a speedup of ice flow and then full development of the ice stream tributary. Ice stream D flows above a thick sedimentary package with an uppermost low-seismic-velocity zone indicative of soft till, and the upglacier and lateral extensions of ice stream D are tightly constrained by the extent of continuous sediments. The inland termination of these sediments suggests that future migration of high-velocity, low-shear-stress ice flow in these regions appears unlikely. Article in Journal/Newspaper Antarc* Antarctica Antarctica Journal Ice Sheet Ice Stream D West Antarctica eCite UTAS (University of Tasmania) Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Siple Coast ENVELOPE(-155.000,-155.000,-82.000,-82.000) West Antarctica Journal of Geophysical Research 111 B1 |
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 Peters, LE Anandakrishnan, S Alley, RB Winberry, JP Voigt, DE Smith, AM Morse, DL Subglacial sediments as a control on the onset and location of two Siple Coast ice streams, West Antarctica |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
description |
Laterally continuous subglacial sediments are a necessary component for ice streaming in the modern onset regions of the ice streams draining the Siple Coast of West Antarctica on the basis of new seismic data combined with previous results. We present geophysical results from seismic reflection and refraction experiments in the upper reaches of ice streams C and D that highlight continuous sedimentary basins within and upstream of the current onset regions of both ice streams, with streaming ice overlying these sedimentary packages. The subglacial environment changes from no-sediment to discontinuous-sediment to continuous-sediment cover along a longitudinal profile from the ice sheet to tributary C1B. Along this same profile, we observe a speedup of ice flow and then full development of the ice stream tributary. Ice stream D flows above a thick sedimentary package with an uppermost low-seismic-velocity zone indicative of soft till, and the upglacier and lateral extensions of ice stream D are tightly constrained by the extent of continuous sediments. The inland termination of these sediments suggests that future migration of high-velocity, low-shear-stress ice flow in these regions appears unlikely. |
format |
Article in Journal/Newspaper |
author |
Peters, LE Anandakrishnan, S Alley, RB Winberry, JP Voigt, DE Smith, AM Morse, DL |
author_facet |
Peters, LE Anandakrishnan, S Alley, RB Winberry, JP Voigt, DE Smith, AM Morse, DL |
author_sort |
Peters, LE |
title |
Subglacial sediments as a control on the onset and location of two Siple Coast ice streams, West Antarctica |
title_short |
Subglacial sediments as a control on the onset and location of two Siple Coast ice streams, West Antarctica |
title_full |
Subglacial sediments as a control on the onset and location of two Siple Coast ice streams, West Antarctica |
title_fullStr |
Subglacial sediments as a control on the onset and location of two Siple Coast ice streams, West Antarctica |
title_full_unstemmed |
Subglacial sediments as a control on the onset and location of two Siple Coast ice streams, West Antarctica |
title_sort |
subglacial sediments as a control on the onset and location of two siple coast ice streams, west antarctica |
publisher |
Amer Geophysical Union |
publishDate |
2006 |
url |
https://doi.org/10.1029/2005JB003766 http://ecite.utas.edu.au/103895 |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) ENVELOPE(-155.000,-155.000,-82.000,-82.000) |
geographic |
Siple Siple Coast West Antarctica |
geographic_facet |
Siple Siple Coast West Antarctica |
genre |
Antarc* Antarctica Antarctica Journal Ice Sheet Ice Stream D West Antarctica |
genre_facet |
Antarc* Antarctica Antarctica Journal Ice Sheet Ice Stream D West Antarctica |
op_relation |
http://ecite.utas.edu.au/103895/1/Peters_et_al_[2006_JGR].pdf http://dx.doi.org/10.1029/2005JB003766 Peters, LE and Anandakrishnan, S and Alley, RB and Winberry, JP and Voigt, DE and Smith, AM and Morse, DL, Subglacial sediments as a control on the onset and location of two Siple Coast ice streams, West Antarctica, Journal of Geophysical Research, 111, (B1) Article B01302. ISSN 0148-0227 (2006) [Refereed Article] http://ecite.utas.edu.au/103895 |
op_doi |
https://doi.org/10.1029/2005JB003766 |
container_title |
Journal of Geophysical Research |
container_volume |
111 |
container_issue |
B1 |
_version_ |
1766274071780130816 |