Data Set ID:

Arctic Soil Freeze/Thaw Status from SMMR and SSM/I, Version 2

This data set contains near-surface (< 5 cm) soil freeze/thaw status on snow-free and snow-covered land surfaces over the Arctic terrestrial drainage basin. The near-surface soil freeze/thaw status is determined by using passive-microwave remote sensing data over snow-free land and a numerical model over snow-covered land. Data are projected to a 25 km x 25 km Northern Hemisphere EASE-Grid. Version 2 of this data set greatly extends the temporal coverage and makes use of data from SMMR as well as SSM/I. Data are from October 1978 to June 2004. Data are in ASCII text format and are available via FTP.

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Geographic Coverage

Data Set Tabs

Temporal Coverage:
  • 1978-10-01 to 2004-06-30
Temporal Resolution:
1 day
Sensor(s): SMMR, SSM/I
Spatial Coverage:
  • N: 90, S: 45, E: 180, W: -180

Spatial Resolution:
  • 25 km x 25 km
  • Snow/Ice > Freeze/Thaw
  • Frozen Ground > Seasonally Frozen Ground
Data Format(s):
  • ASCII Text (.txt)
Data Contributor(s): Tingjun Zhang, Richard Armstrong

We kindly request that you cite the use of this data set in a publication using the following citation. For more information, see Use and Copyright.

Zhang, T. and R. Armstrong 2003. Arctic Soil Freeze/Thaw Status from SMMR and SSM/I, Version 2. [indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center.

Questions? Please contact:

NSIDC User Services
Phone: 1 303 492-6199
Fax: 1 303 492-2468
Contact Address:
National Snow and Ice Data Center
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA