Data Set ID: 
GGD641

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.

This is the most recent version of these data.

Parameter(s):
  • Snow/Ice > Freeze/Thaw > FREEZE/THAW
  • Frozen Ground > Seasonally Frozen Ground > SEASONALLY FROZEN GROUND
Data Format(s):
  • ASCII Text
Spatial Coverage:
N: 90, 
S: 45, 
E: 180, 
W: -180
Platform(s):DMSP, Nimbus-7
Spatial Resolution:
  • 25 km x 25 km
Sensor(s):SMMR, SSM/I
Temporal Coverage:
  • 1 October 1978 to 30 June 2004
Version(s):V2
Temporal Resolution1 dayMetadata XML:View Metadata Record
Data Contributor(s):Tingjun Zhang, Richard Armstrong

Geographic Coverage

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FTP data can be downloaded through a Web browser (Firefox or Edge are recommended) or command line via FTP. For help downloading data through an FTP client, go to the How to access data using an FTP client support page.

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.

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. doi: https://doi.org/10.7265/c7f8-6t68. [Date Accessed].

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