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ArcticRIMS: Daily Thaw Depth and Frozen Ground Depth, Based on ERA-40 2-meter


Daily thaw depth and frozen ground depth are calculated using a frozen ground model. Oelke et al. [2004] provide details, while also referring to [Oelke et al., 2003]. Thaw depth and frozen ground are calculated using different initial model settings. In the first case, all soil down to the lower model boundary is set to sub-freezing initial temperatures. Thawing during the summer months caused the development of a thawed layer at the top with the thaw depth again decreasing during freeze-up of the thawed layer in fall. Frozen ground depth on the other hand is calculated with soil temperatures at all depths above-freezing at the beginning. Here the frozen depth increased during winter, and spring thawing eventually decreases its value.

The data is presented in 24 sub-datasets of different spatial and temporal aggregations.

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Additional information

  • 1.0 (2009-05-15)
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Related projects
Spatial Type grid
Frequency criteria
Language English
ISO Topic Categories
  • climatologyMeteorologyAtmosphere
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Temporal coverage

Begin datetime 1970-01-01 00:00:00
End datetime 2001-12-31 00:00:00

Spatial coverage

Map data from IBCSO, IBCAO, and Global Topography.

Maximum (North) Latitude: 90.00, Minimum (South) Latitude: 45.00
Minimum (West) Longitude: -180.00, Maximum (East) Longitude: 180.00

Primary point of contact information

Richard B. Lammers <>

Additional contact information


Example citation following ESIP guidelines:

Vorosmarty, C., et al. 2009. ArcticRIMS: Daily Thaw Depth and Frozen Ground Depth, Based on ERA-40 2-meter. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. Accessed 20 Sep 2019.

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