Get Data

DOWNLOADING DATA VIA FTP

Data can be downloaded through a Web browser or command line via FTP. When using a Web browser, the FTP link first directs you to an Optional Registration Form that if filled out, will allow you to receive notifications about updates or processing changes related to that specific data set. After completing the Optional Registration Form, the FTP directory becomes available. For additional help downloading data through an FTP client, go to the How to access data using an FTP client support page.

FTP

Data Set ID:
NSIDC-0312

Amundsen Sea Sector Data Set, Version 1

This data set includes a nested model, that starts at low resolution for the whole Antarctic Ice Sheet, and then embeds higher resolution data at limited domains. There are at least three levels of nesting: whole, regional, and specific ice streams. Investigators focused on the Thwaites Glacier and the Pine Island Glacier. The model was produced using data from (Holt et al. 2006) and (Vaughan et al. 2006). Data are in Network Common Data Form (NetCDF) format and are available via FTP.

Geographic Coverage

Spatial Coverage:
  • N: -60, S: -90, E: 180, W: -180

Spatial Resolution: Not Specified
Temporal Coverage:
  • 21 December 2004 to 21 March 2005
Temporal Resolution: Not specified
Parameter(s):
  • Glaciers/Ice Sheets > Ablation Zones/Accumulation Zones
  • Glaciers/Ice Sheets > Glacier Mass Balance/Ice Sheet Mass Balance
  • Glaciers/Ice Sheets
  • Glaciers/Ice Sheets > Glacier Thickness/Ice Sheet Thickness
  • Snow/Ice > Ice Growth/Melt
  • Snow/Ice > Ice Motion
  • Glaciers/Ice Sheets > Ice Sheets
  • Snow/Ice > Ice Velocity
  • Snow/Ice > Snow/Ice Temperature
Platform(s) AIRCRAFT
Sensor(s): RADAR ALTIMETERS
Data Format(s):
  • NetCDF
Version: V1
Data Contributor(s): James Fastook

Data Citation

As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

Fastook, J. L. 2007. Amundsen Sea Sector Data Set, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N5J9649Q. [Date Accessed].

Back to Top

Collapse All / Open All

Detailed Data Description

Format

Data are in NetCDF, which uses rectangular arrays, rows and columns like positions on a checkerboard. For more information on the NetCDF file format, please see the NetCDF Resources at NSIDC Web site. The following table describes the arrays included in each file.

Array Name Description
htice Ice surface elevation relative to present sea level
bedrock Bed elevation, also relative to present sea level, which varies due to isostatic response to changing load
thick Ice thickness, conceptually the differnce between htice and bedrock
adot Net annual accumulation, if value is positive, or ablation, if value is negative, in meters per year (m/yr) ice equivalent
flowa "Effective" ice hardness (a function of the temperature structure within the ice column)
tbed Temperature at the base of the ice column
bmelt Rate at which ice melts from the base of the ice column, where the bed is at pressure melting point; the source of water for the wthick measurement
wthick Amount of water at the bed, expressed as a "thickness" velocity; a column-average ice velocity (m/yr)
Background color on
File Naming Convention

Files are named according to the convention netcdf-###.nc

File Name Approximate 
File Size
Description
netcdf-a1.nc 44.1 MB Continent- Glacier cycle at 40 kBP to present
netcdf-a2.nc 16.7 MB Continent- Glacier cycle at present to 2000 years into the future
netcdf-a23.nc 223.0 MB Continent - short run over 200-300 year period
netcdf-e1.nc 24.4 MB Amundsen Embayment - Glacier cycle at 40 kBP to present
netcdf-e2.nc 9.27 MB Amundsen Embayment - Glacier cycle at present to 2000 years into the future
netcdf-e22.nc 30.9 MB Amundsen Embayment - short run over 200-300 year period
netcdf-e23.nc 123.0 MB Amundsen Embayment - short run over 200-300 year period
netcdf-e24.nc 123.0 MB Amundsen Embayment - short run over 200-300 year period
netcdf-f1.nc 29.6 MB Twaites Glacier - Glacier cycle at 40 kBP to present
netcdf-f2.nc 37.4 MB Twaites Glacier - Glacier cycle at present to 2000 years into the future
netcdf-f22.nc 78.7 MB Twaites Glacier - short run over 200-300 year period
netcdf-f23.nc 41.2 MB Twaites Glacier - short run over 200-300 year period
netcdf-g1.nc 17.3 MB Pine Island Glacier - Glacier cycle at 40 kBP to present
netcdf-g2.nc 21.9 MB Pine Island Glacier - Glacier cycle at present to 2000 years into the future
netcdf-g22.nc 46.1 MB Pine Island Glacier - short run over 200-300 year period
Background color on
Volume

The volume of the entire data set is approximately 517 MB compressed.

Background color on
Spatial Coverage and Resolution

Spatial coverage is N: -60, S: -90, E: 180, W: -180 and the spatial resolution is as follows:

Antarctic Continent at 40 kilometers
Amundsen Sea Embayment at 10 kilometers 
Pine Island Glacier at 5 kilometers 
Thwaites Glacier at 5 kilometers

Background color on
Temporal Coverage

2004/2005 Austral Summers

Background color on
Parameter or Variable

Glacier topography
Ice Sheet topography
Bed elevation
Ice Thickness
Net annual accumulation
Effective ice hardness
Temperature at base of ice column

Background color on

Software and Tools

Software and Tools

For a list of tools for reading/viewing netCDF files, please see the NetCDF Resources at NSIDC: Software and Tools Web page.

Background color on

Data Acquisition and Processing

Data Acquisition Methods

Original data collected by survey aircraft as part of Airborne Geophysical Survey of the Amundsen Sea Embayment (AGASEA). See: Subglacial Topography: Airborne Geophysical Survey of the Amundsen Sea Embayment, Antarctica

Background color on
Derivation Techniques and Algorithms

Model data is derived from University of Maine Ice Sheet model.

Background color on
Sensor or Instrument Description

Original ice thickness data collected by RADAR sounders from survey aircraft. Surface elevation collected using RADAR and LASER altimeters.

Background color on
Processing Steps

Model was used in the embedded mode to do high resolution analysis of the velocity distribution.

Background color on

References and Related Publications

Contacts and Acknowledgments

James L. Fastook
Department of Computer Sciences 
University of Maine
Neville Hall 
Orono, ME 04469-5790
USA

Acknowledgements: 

The National Science Foundation (NSF) supported the development of the model producing these data over many years through several awards. The investigator used flight-line data and surface elevation data from the Airborne Geophysical Survey of the Amundsen Sea Embayment (AGASEA) and the British Antarctic Survey (BAS), respectively.

Document Information

DOCUMENT CREATION DATE

October 2007

No technical references available for this data set.
No FAQs or How Tos available for this data set.

Access complete Knowledge Base

Questions? Please contact:
NSIDC User Services
Phone: 1 303 492-6199
Email: nsidc@nsidc.org