This dataset relates to geophysical marine data collected onboard the RRS James Clark Ross (JR71) during 2002, which built on swath bathymetry and TOPAS survey undertaken on the JR59 cruise in 2001. Data was collected using Kongsberg-Simrad EM120 multibeam swath bathymetry and a TOPAS sub-bottom profiler.
Data was collected as part of a project was to reconstruct the Late Quaternary dynamics of the Antarctic Peninsula Ice Sheet in Marguerite Bay and to compare sedimentation and ice-rafted debris records with the Larsen Ice Shelf area, on the other side of the Antarctic Peninsula. 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 defined. This, in turn, enabled estimates of the past magnitude of ice flow through this glacial system to be calculated.
EM120 multibeam, Quaternary ice sheets, TOPAS sub-bottom profiler, echo-sounder, ice drainage basin, ice stream, ice-rafted debris, sedimentary bedforms
|ISO Topic Categories:||
|Name||Prof Julian Dowdeswell|
|Organisation||Scott Polar Research Institute|
|Name||Prof Colm O Cofaigh|
|Organisation||British Antarctic Survey|
|Reference:||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.
AFI project: 02/48. Ice-rafted debris on the Antarctic continental margin and dynamics of the Antarctic Ice Sheet.
|Quality:||Excellent data quality providing a detailed view of sea-floor morphology and shallow acoustic stratigraphy over an area of about 6,000km2.|
|Lineage:||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.|
|Paleo Temporal Coverage:|
|Paleo Start Date||N/A|
|Paleo End Date||N/A|
|Detailed Location||Marguerite Bay|
|Distribution Size||22 GB|
|Fees||See Natural Environment Research Council (NERC) Data Policy|
|Data Storage:||This data is managed by the UK Polar Data Centre (UK PDC) Geological Data Manager at the British Antarctic Survey (BAS). The raw data is ~ 22 GB and held on the BAS Storage Area Network (SAN).
Sediment cores and associated analysis data were also collected in conjunction with this data and are managed by the UK PDC Geological Data Manager.
|Access Constraints:||Requests for data can be made via the UK Polar Data Centre (UK PDC) at BAS.|
|Use Constraints:||This data is released under a UK Open Government Licence V3.0: http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3|