Geophysical Investigations of Saline Permafrost at Ilulissat, Greenland

Thomas Ingeman-Nielsen, Niels Nielsen Foged, Rune Butzbach, Anders Stuhr Jørgensen

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Abstract

The technical properties and general state of permafrost in Greenland is not well documented. A new coordinated investigation has been initiated, for ground temperature measurements and permafrost mapping in Greenlandic towns in sporadic, discontinuous and continuous permafrost zones. We present investigation results from one of the sites, located at Ilulissat, in an area of discontinuous saline permafrost. We have established ground temperature measurement stations and conducted a shallow geoelectrical study. Our results show that the sediments in the studied area mainly consist of very frost susceptible silty clays. The area has permafrost with a maximum active layer thickness between 0.9 and 1 m. In spite of low permafrost temperatures a considerable part of the pore water is unfrozen, due to high residual salt concentrations. Consequently, the unfrozen water content dominates the technical properties, and the sediments have a limited heat capacity available, should the temperature conditions change.
Original languageEnglish
Title of host publicationNinth International Conference on Permafrost
Number of pages1054
Volume1
Place of PublicationFairbanks
PublisherInstitute of Northern Engineering, University of Alaska Fairbanks
Publication date2008
Pages773-778
ISBN (Print)978-0-9800179-2-2
Publication statusPublished - 2008
Event9th International Conference on Permafrost - Fairbanks, AK, United States
Duration: 29 Jun 20083 Jul 2008
Conference number: 9
http://www.nicop.org/

Conference

Conference9th International Conference on Permafrost
Number9
CountryUnited States
CityFairbanks, AK
Period29/06/200803/07/2008
Internet address

Keywords

  • Ice content, resistivity survey, saline permafrost, temperature measurements

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