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Data Set ID:

Active-Layer Depth of a Finnish Palsa Bog, Version 1

This data set contains 76 active-layer depth measurements (cm) of the Vaisjeäggi palsa bog, Finland, from 08 September 1993 to 14 October 2002. Data were collected from a single location at 69 deg 49'16.6' N, 27 deg 10'17.1' E. Data also contain snow depth (cm) when snow cover was present. Data are in tab-delimited ASCII text format, and are available via ftp.

Geographic Coverage

  • Frozen Ground > Active Layer
Spatial Coverage:
  • N: 69.82, S: 69.82, E: 27.17, W: 27.17

Spatial Resolution: Not Specified
Temporal Coverage:
  • 8 September 1993 to 14 October 2002
Temporal Resolution: Not specified
Data Format(s):
  • ASCII Text
Version: V1
Data Contributor(s): Maria Ronkko
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.

M. Ronkko 2003. Active-Layer Depth of a Finnish Palsa Bog, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. [Date Accessed].

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Detailed Data Description


Data are in tab-delimeted ASCII text format.

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File Naming Convention


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File Size

The file "ggd622_vaisjeaggi_ald.txt" is 2 KB.

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Spatial Coverage

Samples were collected at Vaisjeäggi palsa bog in Finland, 300 m above sea level, at 69°49'16.6" N, 27°10'17.1" E. Soil consisted primarily of peat.

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Temporal Coverage

Rönkkö collected measurements once each year during 1993, 1994, 1995, and 1998. Coverage then extends from June to November 2001, and from March to Oct 2002. Dates are given in format.

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Parameter or Variable

Active-layer depth at a palsa bog, using a 1-m metal rod that was pushed vertically to the peat until resistance was met. Active-layer depth values range from 5 cm to 67 cm. Snow depth was measured when snow cover was present.

Palsa is a peaty permafrost mound possessing a core of alternating layers of segregated ice and peat or mineral soil material. They are typically between 1 m and 7 m in height and a few metres to 100 m in diameter. Most, but not all, palsas occur in the discontinuous permafrost zone. See the Frozen Ground Glossary for more information.

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Software and Tools

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Data Acquisition and Processing

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Contacts and Acknowledgments

Maria Rönkkö
Laboratory of Physical Geography, P.O. Box 64
University of Helsinki 00014

Document Information

Document Creation Date:

February 2003

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