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Time Series of Active Layer Thickness in the Russian Arctic, 1930-1990


This data set consists of active layer thickness (ALT) measurements based on soil temperatures in the Russian Arctic. The active layer is the top layer of ground that freezes in the winter and thaws in the summer over permafrost. Changes in ALT over northern high-latitude permafrost regions have important impacts on the surface energy balance, hydrologic cycle, carbon exchange between the atmosphere and the land surface, plant growth, and ecosystem as a whole. Warming may thicken the active layer and induce permafrost thaw. Investigators collected data from 31 ground-based stations. Derived from monthly averages, the record includes annual maximum active layer depths from 1930 to 1990. Data are in tab-delimited ASCII text format.

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Additional information

  • 1.0 (2009-04-29)
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Related projects
Spatial Type point
Frequency monthly
Language English
Grant Code OPP-0229766
ISO Topic Categories
  • climatologyMeteorologyAtmosphere
GCMD Science Keywords Expand keywords
Related links

Temporal coverage

Begin datetime 1930-01-01 00:00:00
End datetime 1990-12-31 23:59:59

Spatial coverage

Map data from IBCSO, IBCAO, and Global Topography.

Maximum (North) Latitude: 70.75, Minimum (South) Latitude: 60.90
Minimum (West) Longitude: 88.30, Maximum (East) Longitude: 178.90

Primary point of contact information

Tingjun Zhang <>

Additional contact information


Example citation following ESIP guidelines:

Zhang, T., Barry, R., Frauenfeld, O. 2009. Time Series of Active Layer Thickness in the Russian Arctic, 1930-1990. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. Accessed 27 Nov 2020.

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