Active-Layer and Permafrost Temperatures, Sisimiut (Holsteinsborg), Greenland

Summary

This data set contains active-layer and permafrost temperatures from Sisimiut, west Greenland, recorded from 18 sensors at depths of 0.25 m, 0.5 m, 0.75 m, 1 m, 1.25 m, 1.5 m, 1.75 m, 2 m, 2.5 m, 3 m, 3.5 m, 4 m, 4.5 m, 5 m, 6 m, 7 m, 8 m, and 9 m below the surface. Snow depth, snow extent, and surface air temperature were also recorded. Thermometers recorded temperatures once a day from September 1967 to August 1982; however, this data set only contains bi-weekly averages. Data are in tab-delimited ASCII text format and are available via FTP.

Citing These Data:

Olesen, O.B., N. Foged, F.G.M. van Tatenhove, and H.H. Christiansen. 2003. Active-Layer and Permafrost Temperatures, Sisimiut (Holsteinsborg), Greenland. Copenhagen, Denmark: Greenlandic Geological Survey (GEUS). Distributed by National Snow and Ice Data Center. Digital Media.

Overview Table

Category	Description
Data format	Data are in tab-delimited ASCII text format.
Spatial coverage	Data were collected in Sisimiut, west Greenland, at approximately 66.94°N, 53.64°W.
Temporal coverage	Thermometers recorded temperatures once a day from September 1967 to August 1982; however, this data set only contains bi-weekly averages.
File naming convention	ggd23_sensors_sisimiut.txt ggd23_soiltmp_sisimiut.txt
File size	ggd23_soiltmp_sisimiut.txt: 35 KB ggd23_sensors_sisimiut.txt: 1 KB
Parameter(s)	Active-layer and permafrost temperatures, snow depth, snow extent, surface air temperature
Procedures for obtaining data	Data are available via FTP.

Table of Contents

1. Contacts and Acknowledgments
2. Detailed Data Description
3. References and Related Publications
4. Document Information

1. Contacts and Acknowledgments:

Investigator(s) Name and Title:

Ole B. Olesen
Geological Survey of Denmark and Greenland
Øster Voldgade 10
1350 København K
Denmark

Niels Foged
ARTEK BYG-DTU
Danish Technical University
Diplomvej, Building 373
2800 Kgs. Lyngby
Denmark

F.G.M. Tatenhove
Rijnstraat 16-III
1078 RB Amsterdam
The Netherlands

H.H. Christiansen
Institute of Geography
University of Oslo
P.O. Box 1042 Blindern
0316 Oslo
Norway

Technical Contact:

NSIDC User Services
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
Boulder, CO 80309-0449  USA
phone: +1 303.492.6199
fax: +1 303.492.2468
form: Contact NSIDC User Services
e-mail: nsidc@nsidc.org

Acknowledgements:

When using these data, please acknowledge that they are the property of the Danish and Greenlandic Geological Survey (GEUS). A cooperative agreement with GEUS was signed before any access was granted to the hardcopy data digitized by Niels Foged and his students at Artek.

2. Detailed Data Description:

In 1967, the Greenlandic Geological Survey (GEUS) started a program to monitor soil temperatures in permafrost and seasonal frost areas in West Greenland as part of the UNESCO International Hydrological Decade program (Olesen 1967a, van Tatenhove and Olesen 1994). That same year, Ole Olesen established a permafrost station in Sisimiut (formerly known as Holsteinsborg).

Olesen installed platinum resistance thermometers at 18 depths down to 9 m, and backfilled the holes with original material. A Wheatstone bridge recorded temperatures (° C) at approximately noon every day. This instrument measures temperatures between -10°C to 10°C. Olesen also recorded snow depth (cm) and snow extent (quartiles). The thermistors were calibrated at 0°C only. Temperatures were measured in sediment down to 6.4 m and in bedrock from 6.4 m to 9 m. The station was located at 38 m asl. N. Foged and his students digitized the original daily data on a 14-day basis

Format:

Data are in tab-delimited ASCII text format. The file "ggd23_soiltmp_sisimiut.txt" contains the following columns:

• Year

• Month: decimal format (9.5 = mid-September)

• Time (months from 1967/09/01): decimal format

• 1 through 18: Bi-weekly averaged raw soil temperatures for 18 different depths ranging from 0.25 m to 9 m. Missing values are indicated by "-999."

• Snow cover index (1-4): Snow extent in quartiles. 1 = 25%, 2 = 50%, 3 = 75%, 4 = 100%, 0 = no data

• Snow depth (cm)

• Max air temp (deg. C)

• Min air temp (deg. C)

The file "ggd23_sensors_sisimiut.txt" lists the sensors with corresponding depths (m) and calibration factors (°C). Some thermometers stopped working during the period of data collection.

File Naming Convention:

ggd23_soiltmp_sisimiut.txt:
ggd23_sensors_sisimiut.txt

File Size:

ggd23_soiltmp_sisimiut.txt: 35 KB
ggd23_sensors_sisimiut.txt: 1 KB

Spatial Coverage:

Data were collected in Sisimiut, west Greenland, at approximately 66.94°N, 53.64°W.

Temporal Coverage:

Thermometers recorded temperatures once a day from September 1967 to August 1982; however, this data set only contains bi-weekly averages.

3. References:

Van Tatenhove, F.G.M., and O.B. Olesen. 1994. Ground temperature and related permafrost characteristics in West Greenland. Permafrost and Periglacial Processes 5:199-215.

Olesen, O.B. 1967a. Ground temperature measurements in West Greenland. The Geological Survey of Greenland, Report no. 15, 25-26.

Olesen, O.B. 1967b. Oprettelse af stationer til maaling af jordtemperaturer i Holsteinsborg og Soendre Stroemfjord. Report Greenland Geological Survey, 19 p. In Danish.

4. Document Information:

Document Creation Date:

March 2003

Document Revision Date:

March 2003

Document URL:

http://nsidc.org/data/docs/fgdc/ggd23_activlayer_greenland/index.html