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Rock glaciers, Disko Island, Greenland

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Identification Information:

Dataset Identifier:

GGD283

Citation:

Citation Information:

Originator: Humlum, O
Publication Date: 19980101
Title: Rock glaciers, Disko Island, Greenland
Publication Information:
Publication Place: Boulder, Colorado USA
Publisher: NSIDC: National Snow and Ice Data Center
Online Linkage: http://nsidc.org/data/ggd283.html

Description:

Abstract:

Disko Island (8600 km2) is situated west of central mainland Greenland. The island is part of the Tertiary volcanic province of West Greenland and is mainly made up by lavas. The landscape is a plateau basalt landscape with cirque carved lava plateaus and U-shaped valleys and fjords. Rock glaciers are frequent in Disko Island (Humlum, 1982). In southern Disko Island, about 60 km SSE of the two study sites, meteorological observations have been carried out since 1923 in the village of Godhavn. The present (1961-1990) mean annual air temperature is -3.9 C, the coldest month is March (-15.1 C), and July is the warmest month (7.1 C). The mean annual precipitation at Godhavn is about 400 mm water equivalent. Most of the precipitation (75 %) usually falls during the period June to December, associated with advection of moist, maritime air masses from the south and southwest along the Davis Strait. The remaining part of the year is comparatively dry, as it is dominated by cold and dry katabatic air masses flowing off the Greenland Ice Sheet to the east. Approximately 60-70 % of the mean annual precipitation is snow and in Godhavn a persistent snow cover is registered from late September to late May.

No systematic mapping of permafrost or permafrost related terrain features have been carried out in this part of West Greenland. Weidick (1968), however, places Disko Island within the zone of continuous permafrost. This is supported by the occurrence of open system pingos (Christiansen, 1995) and numerous rock glaciers (Humlum, 1982, 1984, 1988a, 1988b, 1996; Humlum et al., 1995; Rasch et al. 1996), which are geomorphic indications of the presence of widespread permafrost in Disko Island. Adopting a standard continental geothermal gradient of about 0.033 C m-1, the mean annual air temperature of -7.5 C (1991-96) indicates a potential permafrost thickness of about 175-225 m. This estimate is presumably somewhat conservative, as the Little Ice Age annual air temperature presumably was about 2C below modern values (Humlum, 1996), which would provide conditions for a somewhat thicker permafrost layer than is suggested by modern meteorological values. The high frequency of rock glaciers on Disko Island is presumably derived from high rock weathering rates (Humlum, 1992). These data are presented on the CAPS Version 1.0 CD-ROM, June 1998.

Purpose: scientific research

Documentation:

User's Guide:

Citation Information:

Originator: Humlum, O
Publication Date: 19980101
Title: Rock glaciers, Disko Island, Greenland
Publication Information:
Publication Place: Boulder, Colorado USA
Publisher: NSIDC: National Snow and Ice Data Center
Online Linkage: http://nsidc.org/data/docs/fgdc/ggd283_rockglac_greenland/index.html

Time Period of Content:

Time Period Information:

Range of Dates/Times:

Beginning Date: Unknown
Ending Date: Unknown

Currentness Reference: publication date

Status:

Progress: Complete
Maintenance and Update Frequency: Unknown

Spatial Domain:

Bounding Coordinates:

 

West Bounding Coordinate: -55°
East Bounding Coordinate: -52°
North Bounding Coordinate: 70.5°
South Bounding Coordinate: 69.5°

Keywords:

Theme:

Theme Keyword Thesaurus: NASA Global Change Master Directory (GCMD) Science Keywords
Theme Keyword: EARTH SCIENCE Cryosphere Frozen Ground Permafrost
Theme Keyword: EARTH SCIENCE Cryosphere Frozen Ground Rock Glaciers
Theme Keyword: EARTH SCIENCE Land Surface Frozen Ground Permafrost
Theme Keyword: EARTH SCIENCE Land Surface Frozen Ground Rock Glaciers

Theme:

Theme Keyword Thesaurus: None
Theme Keyword:

Theme:

Theme Keyword Thesaurus: None
Theme Keyword: Mapping
Theme Keyword: Meteorology
Theme Keyword: Permafrost Properties
Theme Keyword: Rock Glaciers

Place:

Place Keyword Thesaurus: NASA Global Change Master Directory (GCMD) Location Keywords
Place Keyword: Continent North America Greenland Southwestern Disko Island, central West Greenland

Access Constraints:

None

Use Constraints:

None

Point of Contact:

Contact Information:

Contact Person Primary:

Contact Person: Ole Humlum
Contact Organization: The University Centre on Svalbard, UNIS, Department of Geology

Contact Address:

Address Type: mailing
Address:
  • P.O. Box 156
City: Longyearbyen
State or Province: Unknown
Postal Code: 9171
Country: Norway

Contact Voice Telephone: 47 79 02 33 00
Contact Facsimile Telephone: 47 79 02 33 01
Contact Electronic Mail Address: oleh@unis.no

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Distribution Information:

Distributor:

Contact Information:

Contact Organization Primary:

Contact Organization: National Snow and Ice Data Center
Contact Person: NSIDC User Services

Contact Address:

Address Type: mailing
Address:
  • National Snow and Ice Data Center
  • CIRES, 449 UCB
  • University of Colorado
City: Boulder
State or Province: CO
Postal Code: 80309-0449
Country: USA

Contact Voice Telephone: 1 303 492-6199
Contact Facsimile Telephone: 1 303 492-2468
Contact Electronic Mail Address: nsidc@nsidc.org

Resource Description:

GGD283

Distribution Liability:

NSIDC cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NSIDC makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

Standard Order Process:

Digital Form:

Digital Transfer Information:

Format Name: ASCII Text (.txt)

Digital Transfer Option:

Online Option:

Computer Contact Information:

Network Address:

Network Resource Name: Click here.

Fees: None

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Metadata Reference Information:

Metadata Date:

20120824

Metadata Review Date:

20120824

Metadata Contact:

Contact Information:

Contact Person Primary:

Contact Person: NSIDC User Services
Contact Organization: National Snow and Ice Data Center

Contact Address:

Address Type: mailing
Address:
  • National Snow and Ice Data Center
  • CIRES, 449 UCB
  • University of Colorado
City: Boulder
State or Province: CO
Postal Code: 80309-0449
Country: USA

Contact Voice Telephone: 1 303 492-6199
Contact Facsimile Telephone: 1 303 492-2468
Contact Electronic Mail Address: nsidc@nsidc.org

Metadata Standard Name:

FGDC Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata

Metadata Standard Version:

FGDC-STD-012-2002

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Metadata Views

FGDC Text-Only

Federal Geographic Data Committee (FGDC) in plain text

FGDC XML

Federal Geographic Data Committee (FGDC) in Extensible Markup Language (XML)

DIF HTML

NASA Global Change Master Directory (GCMD) Directory Interchange Format (DIF)

ISO HTML

International Organization for Standardization (ISO) 19115:2003 Geographic Information Metadata