Borehole K85903-Station 905-Paakitsoq

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General Information

Created: 2014-02-27 12:08:18
Modified: 2014-02-27 12:45:23

Active: No
Country:Greenland
Site:Paakitsoq
GTN-P:G 02
Responsible Countries: Greenland,
Timezone:UTC/GMT -03:00 hours
Vegetation Type:Tundra
Responsible Person:Jørgen Bille Hansen

MEAN ANNUAL GROUND TEMPERATURE AT OR NEAR DEPTH OF ZERO ANNUAL AMPLITUDE (°C) – report  value for most recent year or 12 month interval: -3.8 to –4.1ºC (based on 1986-1992 annual (summer to summer) values) at 20 m depth. At that depth the annual variation was on average 0.3ºC.

 

Depth of zero annual amplitude (or depth of measurement reported above)  (m) A little below 20 m but above 60 m

 

Year or 12 month interval for mean reported above: 1986-1992 summer to summer means

 

Range (if applicable) of mean annual ground temperature over observation period (°C) –3.8 to –4.1ºC

 

AIR TEMPERATURE AND SNOW COVER THICKNESS/DENSITY MEASUREMENTS AT THE BOREHOLE SITE (indicate frequency of observations):

Air temperature: Yes [x] No [ ]    Snow thickness: Yes[ ] No[x]   Density: Yes [ ] No[x]

 

NAME AND LOCATION OF CLOSEST CLIMATE STATION (latitude, longitude, and distance from borehole, km) – provide (if available) mean monthly air temperature and snow depth of reporting interval for mean annual ground temperature: Ilulissat (69º14’N, 51º4’W, 40 km SW of Pakitsoq borehole), MAAT 1961-1990: -5ºC, 266 mm annual precipitation mean for 1961-1990. Meteorological observations was started in Ilulissat already in 1873.

Depth:250 m
Drilling Angle:90 °
Date Drilled:13. Jul 1985
Type:helicopter has been used during previous work in this area, which is about 45 km NE of Ilulissat village. no roads in this area, but about 2 km from the coast and there is possibilities for snow scooter transport to the site in winter.
Distance From Road:45000 m
Type:river
Distance From Heat:1000 m
Slope:8 °
Aspect:244.2 °
Permafrost Thickness:200 m
Permafrost Zone:Continuous
Vegetation:looks like a mixture of polar desert and tundra according to pictures on GoogleEarth (Kerstin Gillen)
Landform:The Pakitsoq borehole is today located less than 2 km from the western margin of the Greenland Ice Sheet, and therefore the site presumably became ice free in the early Holocene, when the Greenland Ice Sheet melted back to a position 60-120 km behind the present margin. Presumably the Pakitsoq borehole site was not covered by any late Holocene e.g. Little Ice Age (LIA) glacial advance, as the Ice Sheet today in this region is standing at its maximum LIA position (Ole Humlum, pers. comm.), but no geomorphological mapping exist for the area.
Lithology:Gneiss bedrock with some granitic parts all the way down the borehole. Few 0-6 cracks pr m in the upper 14 m, weathered zone near the terrain surface, crack zones with broken bedrock at depths of 26.75-28.50 m, 121.70-122.45 m, 218 m and 231 m, otherwise almost crack-free bedrock in the entire borehole. Based on this geological information the ice content must be low.
Morphology:relatively flat terrain surface at the borehole site, but bedrock knolls within 2 km from borehole site.
Access Timeseries
Bibliographic References
Van Tatenhove, F.G.M and Olesen, O.B. 1994. Ground Temperature and Related Permafrost Characteristics in West Greenland. Permafrost and Periglacial Processes, 5, 199-215.
Kern-Hansen, C. 1990. Data basis for permafrost studies in Greenland. In Proceedings of Polartech90, 635-644.

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Map

Longitude:-50.27777778 °
Latitude:69.46916667 °
Elevation:206.87001038 m
EPSG:4326
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