AFI 02/48_01 - Ice-rafted debris on the Antarctic continental margin and dynamics of the Antarctic Ice Sheet - Swath Bathymetry, EM120 and TOPAS data collected from the Weddell Sea and Marguerite Bay, Feb - March 2002Entry ID: GB-NERC-BAS-AEDC-00290
Abstract: Ice-rafted (Heinrich) layers in the North Atlantic provide clear evidence that basins of large Quaternary ice sheets have, in the past, exhibited major dynamic instabilities. The presence of large ice sheets on the modern Antarctic continent provides an important opportunity to investigate the deposition of ice-rafted debris in a region where the dynamics of the parent drainage basins are known. ... The aim of the project was to reconstruct the Late Quaternary dynamics of the Antarctic Peninsula Ice Sheet in Marguerite Bay and to compare sedimentation and IRD records with the Larsen Ice Shelf area, on the other side of the Antarctic Peninsula. Two cruises were undertaken to collect the data. The JR71 (2002) cruise builds on the swath bathymetry and TOPAS survey undertaken on the JR59 (2001) cruise. The mapping of streamlined sedimentary bedforms on the outer shelf has allowed the dimensions of a former fast-flowing ice stream present at the Last Glacial Maximum to be defin
ed. This, in turn, enabled estimates of the past magnitude of ice flow through this glacial system to be calculated. Data was collected using Kongsberg-Simrad EM120 multibeam swath bathymetry and a TOPAS sub-bottom profiler. EM120 data was processed using the Kongsberg-Simrad bathymetric processing package &NEPTUNE&. These ice flux estimates were compared with computer-model reconstructions of former ice-sheet dynamics as a robust test of model performance.
Start Date: 2002-02-01Stop Date: 2002-03-01
Paleo Temporal Coverage
CRYOSPHERE > GLACIERS/ICE SHEETS > ICE SHEETS
TERRESTRIAL HYDROSPHERE > GLACIERS/ICE SHEETS > ICE SHEETS
OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > SEAFLOOR TOPOGRAPHY
OCEANS > MARINE SEDIMENTS > SEDIMENT TRANSPORT
OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY
CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIER MOTION/ICE SHEET MOTION
TERRESTRIAL HYDROSPHERE > GLACIERS/ICE SHEETS > GLACIER MOTION/ICE SHEET MOTION
Quality Data quality was excellent and provided a detailed view of sea-floor morphology and shallow acoustic stratigraphy over an area of about 6,000km2
Access Constraints This data is governed by the NERC Data Policy
Use Constraints This data is governed by the NERC Data Policy
Data Set Progress
Distribution Media: Online FTP
Fees: See Natural Environment Research Council (NERC) Data Policy
Role: DIF AUTHOR
Phone: +44 (0)1223 221594
Phone: +44 (0) 1223 221312
Fax: +44 (0)1223 362616
Email: aedc at bas.ac.uk
Antarctic Environmental Data Centre British Antarctic Survey High Cross, Madingley Road
Province or State: Cambridgeshire
Postal Code: CB3 0ET
Country: UNITED KINGDOM
Scott Polar Research Institute
Dowdeswell, J.A., Ottesen, D., Evans, J., Ó Cofaigh, C. and Anderson, J.B., 2008. Submarine glacial landforms and rates of ice-stream collapse. Geology, v. 36, p. 819-822.
Ó Cofaigh, C., Dowdeswell, J.A., Evans, J. and Larter, R.D., 2008. Geological constraints on Antarctic palaeo-ice stream retreat rates. Earth Surface Processes and Landforms, v. 33, p. 513-525.
Ó Cofaigh, C., Evans, J., Dowdeswell, J.A. and Larter, R.D., 2007. Till characteristics, genesis and transport beneath Antarctic paleo-ice streams. Journal of Geophysical Research, v. 112, F03006, doi:101029/2006JF000606.
Dowdeswell, J.A., 2006. Ice sheets and marine sedimentation on high-latitude continental margins. Blackwell. 30. Glacier Science and Environmental Change.
Ó Cofaigh, C., Dowdeswell, J.A., Allen, C.S., Hiemstra, J., Pudsey, C.J., Evans, J. and Evans, D.J.A. 2005. Flow dynamics and till genesis associated with a marine-based Antarctic palaeo-ice stream. Quaternary Science Reviews. 24, 709-740.
Dowdeswell, J.A., Ó Cofaigh, C. and Pudsey, C.J. 2004. Thickness and extent of the subglacial till layer beneath an Antarctic paleo-ice stream. Geology. 32, 13-16.
Dowdeswell, J.A., Ó Cofaigh, C. and Pudsey, C.J. 2004. Continental slope morphology and sedimentary processes at the mouth of an Antarctic palaeo-ice stream. Marine Geology. 204, 203-214.
Ó Cofaigh, C., Dowdeswell, J. A. and Pudsey, C. J. 2004. Sedimentation and Flow Dynamics Associated with a Marine-Based Antarctic Palaeo-Ice Stream. Antarctic Funding Initiative, Third Workshop, New Hall, Cambridge, 28-29 September 2004.
Ó Cofaigh, C., Taylor, J., Dowdeswell, J.A. and Pudsey, C.J. 2003. Palaeo-ice streams, trough-mouth fans and high-latitude continental slope sedimentation. Boreas. 32, 37-55.
Dowdeswell, J. A., Pudsey, C. J. and Ó Cofaigh, C. 2003. Geophysical and Geological Investigations of an Antarctic Peninsula Palaeo-Ice Stream. Antarctic Funding Initiative, Second Workshop, New Hall, Cambridge, 2-3 October 2003
Dowdeswell, J., Pudsey, C. and Ó Cofaigh, C. 2002. Ice Rafted Debris on the Antarctic Continental Margin and the Dynamics of the Antarctic Ice Sheet. Antarctic Funding Initiative [AFI], First Workshop, New Hall, Cambridge, 24 Sep 2002.
Creation and Review Dates
DIF Creation Date: 2007-11-13
Last DIF Revision Date: 2010-04-27