Data Set ID:

Active Layer Monitoring, Arctic and Subarctic Canada, Version 6

This project involves measuring regional and site variability in maximum annual active layer development and vertical surface movement over permafrost, and monitoring sites over time in order to observe trends. The project records maximum thaw penetration, maximum heave and subsidence, late season snow depths, current depth of thaw, elevation, and soil properties. Some sites are twinned with soil- and air-temperature recording equipment.

The project includes about 60 monitoring stations extending from Fort Simpson, Canada, in the upper Mackenzie River valley to the Beaufort Sea coast at North Head, Richards Island, Canada. Ten of the sites are part of the IPA's Circumpolar Active Layer Monitoring (CALM) Program. CALM site numbers are in parentheses after the site names: North Head (C3), Taglu (C4), Lousy Point (C5), Reindeer Depot (C7), Rengleng River (C8), Mountain River (C9), Norman Wells (C11), Ochre River (C13), Willowlake River (C14), and Fort Simpson (C15). See the CALM Program Web page for geographic coordinates and site history for all CALM sites.

These data are the property of the people of Canada and the responsibility of the Geological Survey of Canada. If published, adequate acknowledgment is expected. Please contact F. M. Nixon regarding use of the data set or access to the extended data.

Get Data


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.


Geographic Coverage

  • Frozen Ground > Active Layer
  • Snow/Ice > Freeze/Thaw
  • Frozen Ground > Periglacial Processes
  • Soils > Permafrost
  • Frozen Ground > Permafrost
  • Snow/Ice > Permafrost
  • Snow/Ice > Snow Depth
  • Soils > Soil Moisture/Water Content
Spatial Coverage:
  • N: 69.717, S: 61.883, E: -121.6, W: -134.95

Spatial Resolution: Not Specified
Temporal Coverage:
  • 1 January 1991 to 31 December 2007
(updated January 2009)
Temporal Resolution: Not specified
Data Format(s):
  • ASCII Text
Platform(s) Not specified
Sensor(s): Not specified
Version: V6
Data Contributor(s): F. Mark Nixon, R. Mackay

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.

Nixon, F. Mark 2003, updated January 2009. Active Layer Monitoring, Arctic and Subarctic Canada, Version 6. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. [Date Accessed].
A user guide is not available for this data set.
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