NSIDC-0292_1

Subglacial Topography: Airborne Geophysical Survey of the Amundsen Sea Embayment, Antarctica, Version 1

Version 1 eng; usa
  • 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.
  • Purpose
    Scientific Research

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    Processing Level

    NA

    Quality
    Collection Progress

    Complete

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    Science Keywords
    • EARTH SCIENCE
    • Cryosphere
    • Glaciers/Ice Sheets
    • Glacier Topography/Ice Sheet Topography
    • EARTH SCIENCE
    • Terrestrial Hydrosphere
    • Glaciers/Ice Sheets
    • Glacier Topography/Ice Sheet Topography
    • EARTH SCIENCE
    • Cryosphere
    • Snow/Ice
    • Ice Depth/Thickness
    • EARTH SCIENCE
    • Terrestrial Hydrosphere
    • Snow/Ice
    • Ice Depth/Thickness
    • EARTH SCIENCE
    • Oceans
    • Bathymetry/Seafloor Topography
    • Seafloor Topography
    • EARTH SCIENCE
    • Land Surface
    • Topography
    • Terrain Elevation
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ISO Topic Categories
  • CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
  • GEOSCIENTIFIC INFORMATION

Acquisition Information Fields:

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Platforms
  • Aircraft
    AIRCRAFT
    Instruments
    • GPS
    • RADAR
    • RADAR ECHO SOUNDERS

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Spatial Information Fields:

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    Coverage Type Zone Identifier Geometry Granule Representation
    HORIZONTAL CARTESIAN GEODETIC
Location Keywords
    • Continent
    • Antarctica
    • Amundsen Sea Embayment

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  • National Snow and Ice Data Center
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    John Holt

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    John Holt

    4412 Spicewood Springs Rd. #600
    Austin, TX 78759-850

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    Donald Blankenship

    4412 Spicewood Springs Rd. #600
    Austin, TX 78759-8500

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    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
    • Email
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    National Snow and Ice Data Center

    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
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Collection Citations Fields:

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    Collection Citations
    • Subglacial Topography: Airborne Geophysical Survey of the Amundsen Sea Embayment, Antarctica, Version 1
      1

      Published by: National Snow and Ice Data Center