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

Spatial Coverage:
  • N: 90, S: 45, E: 180, W: -180

Spatial Resolution:
  • 25 km x 25 km
Temporal Coverage
  • 1978-10-01 to 2004-06-30
Temporal Resolution:
1 day
  • Snow/Ice > Freeze/Thaw
  • Frozen Ground > Seasonally Frozen Ground
Sensor(s): SMMR, SSM/I
Data Format(s):
  • ASCII Text (.txt)
Data Contributor(s): Tingjun Zhang, Richard Armstrong

Data Citation

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

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. [Date Accessed].

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