Subglacial Topography: Airborne Geophysical Survey of the Amundsen Sea Embayment, Antarctica
Entry ID: NSIDC-0292

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Summary
Abstract: This data set includes 5 km gridded data from the Airborne Geophysical Survey of the Amundsen Sea Embayment, Antarctica (AGASEA) conducted during the 2004-2005 austral summer. Investigators derived maps of the ice sheet surface and subglacial topography, which covers the entire catchments of both the Thwaites Glacier and the Pine Islands Glacier, from airborne survey systems mounted on a Twin Otter aircraft. The surveys had sufficient density to identify critical ice dynamic transitions within the Amundsen Sea Embayment (ASE). The ASE is the only major drainage to exhibit significant elevation change over the period of available satellite observations. Modeling of the Western Antarctic Ice Sheet (WAIS) deglaciation pinpointed the Pine Island Glacier and the Thwaites Glacier, which comprise a major portion of the ASE, as the most vulnerable features of the WAIS. Present knowledge of the ice thickness and subglacial boundary conditions in the ASE are insufficient to understand its evolution or its sensitivity to climatic change, and it is not yet determined whether these changes are evidence of ongoing deglaciation or simply a fluctuation that does not threaten the equilibrium of the ice sheet. This research will support the efforts of a community of United States and international researchers to assess the present and predict the future behavior of the ice sheet in the ASE. These data are available via FTP.

Related URL
Link: VIEW PROJECT HOME PAGE
Description: Airborne geophysical survey of the Amundsen Sea Embayment, Antarctica (AGASEA)


Link: VIEW PROJECT HOME PAGE
Description: University of Texas, Institute for Geophysics (UTIG) Web site


Link: VIEW RELATED INFORMATION
Description: Ice Thickness and Surface Elevation, Southeastern Ross Embayment, West Antarctica


Geographic Coverage
 N: -71.7 S: -81.7  E: -84.5  W: -134.9

Data Set Citation
Dataset Originator/Creator: John W. Holt
Dataset Title: Subglacial Topography: Airborne Geophysical Survey of the Amundsen Sea Embayment, Antarctica
Dataset Release Date: 2006-10-25
Dataset Release Place: Boulder, Colorado USA
Dataset Publisher: NSIDC: National Snow and Ice Data Center
Dataset DOI: doi:10.7265/N59W0CDC
Online Resource: http://nsidc.org/data/NSIDC-0292


Temporal Coverage
Start Date: 2004-11-01
Stop Date: 2005-03-31


Location Keywords
CONTINENT > ANTARCTICA
GEOGRAPHIC REGION > POLAR


Data Resolution
Latitude Resolution: 5 km
Longitude Resolution: 5 km


Science Keywords
CRYOSPHERE >GLACIERS/ICE SHEETS >GLACIER TOPOGRAPHY/ICE SHEET TOPOGRAPHY    [Definition]
TERRESTRIAL HYDROSPHERE >GLACIERS/ICE SHEETS >GLACIER TOPOGRAPHY/ICE SHEET TOPOGRAPHY    [Definition]
CRYOSPHERE >SNOW/ICE >ICE DEPTH/THICKNESS    [Definition]
TERRESTRIAL HYDROSPHERE >SNOW/ICE >ICE DEPTH/THICKNESS    [Definition]
OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY >SEAFLOOR TOPOGRAPHY    [Definition]
LAND SURFACE >TOPOGRAPHY >TERRAIN ELEVATION    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
GEOSCIENTIFIC INFORMATION


Platform
Aircraft    [Information]


Instrument
GPS >Global Positioning System    [Information]
RADAR >Radio Detection and Ranging    [Information]
RADAR ECHO SOUNDERS


Keywords
AGDC
Airborne geophysical survey of the Amundsen Sea Embayment, Antarctica (AGASEA)
Amundsen Basin
Amundsen Sea Embayment
Antarctica
Ice Sheet Elevation
Pine Island Glacier
Subglacial Topography
Thwaites Glacier
WAIS
West Antarctica
West Antarctic Ice Sheet


Data Set Progress
COMPLETE


Originating Center
NSIDC_AGDC


Data Center
NSIDC U.S. Antarctic Data Coordination Center    [Information]
Data Center URL: http://nsidc.org/usadcc/

Data Center Personnel
Name: NSIDC USADCC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


NSIDC Antarctic Glaciological Data Center    [Information]
Data Center URL: http://nsidc.org/agdc/

Data Center Personnel
Name: NSIDC AGDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


National Snow and Ice Data Center    [Information]
Data Center URL: http://nsidc.org

Data Center Personnel
Name: NSIDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA



Distribution
Distribution_Media: FTP
Distribution_Size: 140 KB
Distribution_Format: Binary

Distribution_Media: FTP
Distribution_Size: 1.32 MB
Distribution_Format: ASCII Text (.txt)


Personnel
JOHN W. HOLT
Role: INVESTIGATOR
Phone: 512-471-0489
Fax: 512-471-0999
Email: jack at ig.utexas.edu
Contact Address:
Institute for Geophysics
University of Texas at Austin
4412 Spicewood Springs Rd. #600
City: Austin
Province or State: TX
Postal Code: 78759-8500
Country: USA


DON BLANKENSHIP
Role: INVESTIGATOR
Phone: (512) 471-0489
Fax: (512) 471-8844
Email: blank at ig.utexas.edu
Contact Address:
J.J. Pickle Research Campus, Bldg. 196 | 10100 Burnet Rd.
City: Austin
Province or State: TX
Postal Code: 78758
Country: USA


DAVID L. MORSE
Role: INVESTIGATOR
Contact Address:
Institute for Geophysics
University of Texas at Austin
4412 Spicewood Springs Rd. #600
City: Austin
Province or State: TX
Postal Code: 78759-8500
Country: USA


DAVID G. VAUGHN
Role: INVESTIGATOR
Email: dgv at bas.ac.uk
Contact Address:
British Antarctic Survey
High Cross
Madingley Road
City: Cambridge
Postal Code: CB3 0ET
Country: United Kingdom


HUGH F.J. CORR
Role: INVESTIGATOR
Email: hfjc at bas.ac.uk
Contact Address:
British Antarctic Survey
High Cross
Madingley Road
City: Cambridge
Postal Code: CB3 0ET
Country: United Kingdom


DUNCAN A. YOUNG
Role: INVESTIGATOR
Contact Address:
J.J. Pickle Research Campus
Bldg. 196
10100 Burnet Road (R2200)
City: Austin
Province or State: Texas
Postal Code: 78758-4445
Country: USA


NSIDC USER SERVICES
Role: TECHNICAL CONTACT
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


Publications/References
Holt, J. W., D. D. Blankenship, D. L. Morse, D. A. Young, M. E. Peters, S. D. Kempf, et. al. 2006. New boundary conditions for the West Antarctic Ice Sheet: subglacial topography of the Thwaites and Smith glacier catchments. Geophysical Research Letters 33, L09502. doi:10.1029/2005GL025561. Vaughan, D. G., H. F. J. Corr, F. Ferraccioli, N. Frearson, A. O'Hare, D. Mach, J. Holt, et. al. 2006. New boundary conditions for the West Antarctic Ice Sheet: subglacial topography beneath Pine Island Glacier. Geophysical Research Letters 33, L09501. doi:10.1029/2005GL025588.

Creation and Review Dates
DIF Creation Date: 2006-10-25
Last DIF Revision Date: 2014-05-21

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