eCite Digital Repository

Subglacial conditions at a sticky spot along Kamb Ice Stream, West Antarctica

Citation

Peters, LE and Anandakrishnan, S, Subglacial conditions at a sticky spot along Kamb Ice Stream, West Antarctica, Antarctica: A Keystone in a Changing World - Online Proceedings of the 10th ISAES, August 26-September 1, Santa Barbara, California, pp. 1-5. (2007) [Refereed Conference Paper]


Preview
PDF
846Kb
  

Copyright Statement

Copyright the authors

Official URL: http://pubs.usgs.gov/of/2007/1047/

DOI: doi:10.3133/ofr20071047SRP097

Abstract

We present the results of a seismic reflection experiment performed transverse to flow a few tens of kilometers above the main trunk of Kamb Ice Stream, West Antarctica, where we image a basal high surrounded by variable subglacial conditions. This high rises as much as 200 m above the surrounding bed, acting as a major sticking point that resists fast flow. Application of the amplitude variation with offset (AVO) seismic technique has highlighted regions of frozen sediments along our profile, suggesting that the ice stream is experiencing basal freeze-on in the region. The bedrock high appears to be at least partially draped in sediment cover, with a concentrated area of weak, dilatant till flanking one edge. This dilatant till is further dispersed along our profile, though it does not possess enough continuity to maintain streaming ice conditions. These results support the hypothesis that the ongoing shutdown of Kamb Ice Stream is due to a loss in continuous basal lubrication.

Item Details

Item Type:Refereed Conference Paper
Keywords:subglacial environment, seismology
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Glaciology
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts)
UTAS Author:Peters, LE (Dr Leo Peters)
ID Code:103888
Year Published:2007
Deposited By:IMAS Research and Education Centre
Deposited On:2015-10-28
Last Modified:2016-02-29
Downloads:164 View Download Statistics

Repository Staff Only: item control page