Degrading mountain permafrost in southern Norway: spatial and temporal variability of mean ground temperatures, 1999–2009

A ten-year record (1999–2009) of annual mean ground surface temperatures (MGSTs) and mean ground temperatures (MGTs) was analysed for 16 monitoring sites in Jotunheimen and on Dovrefjell, southern Norway. Warming has occurred at sites with cold permafrost, marginal permafrost and deep seasonal frost...

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Main Authors: Isaksen, Ketil, Ødegård, Rune Strand, Etzelmüller, Bernd, Hilbich, Christin, Hauck, Christian, Farbrot, Herman, Eiken, Trond, Hygen, Hans Olav, Hipp, Tobias Florian
Language:English
Published: 2012
Subjects:
Online Access:http://doc.rero.ch/record/28729/files/hau_dmp.pdf
id ftreroch:oai:doc.rero.ch:20120309130630-EF
record_format openpolar
spelling ftreroch:oai:doc.rero.ch:20120309130630-EF 2023-05-15T16:02:19+02:00 Degrading mountain permafrost in southern Norway: spatial and temporal variability of mean ground temperatures, 1999–2009 Isaksen, Ketil Ødegård, Rune Strand Etzelmüller, Bernd Hilbich, Christin Hauck, Christian Farbrot, Herman Eiken, Trond Hygen, Hans Olav Hipp, Tobias Florian 2012-03-09T12:08:00Z http://doc.rero.ch/record/28729/files/hau_dmp.pdf eng eng http://doc.rero.ch/record/28729/files/hau_dmp.pdf 2012 ftreroch 2023-02-16T17:24:47Z A ten-year record (1999–2009) of annual mean ground surface temperatures (MGSTs) and mean ground temperatures (MGTs) was analysed for 16 monitoring sites in Jotunheimen and on Dovrefjell, southern Norway. Warming has occurred at sites with cold permafrost, marginal permafrost and deep seasonal frost. Ongoing permafrost degradation is suggested both by direct temperature monitoring and indirect geophysical surveys. An increase in MGT at 6.6–9.0-m depth was observed for most sites, ranging from ~0.015 to ~ 0.095°C a-1. The greatest rate of temperature increase was for sites having MGTs slightly above 0°C. The lowest rate of increase was for marginal permafrost sites that are affected by latent heat exchange close to 0°C. Increased snow depths and an increase in winter air temperatures appear to be the most important factors controlling warming observed over the ten-year period. Geophysical surveys performed in 1999 to delineate the altitudinal limit of mountain permafrost were repeated in 2009 and 2010 and indicated the degradation of some permafrost over the intervening decade. Other/Unknown Material Dovrefjell permafrost RERO DOC Digital Library Dovrefjell ENVELOPE(13.500,13.500,79.000,79.000) Norway
institution Open Polar
collection RERO DOC Digital Library
op_collection_id ftreroch
language English
description A ten-year record (1999–2009) of annual mean ground surface temperatures (MGSTs) and mean ground temperatures (MGTs) was analysed for 16 monitoring sites in Jotunheimen and on Dovrefjell, southern Norway. Warming has occurred at sites with cold permafrost, marginal permafrost and deep seasonal frost. Ongoing permafrost degradation is suggested both by direct temperature monitoring and indirect geophysical surveys. An increase in MGT at 6.6–9.0-m depth was observed for most sites, ranging from ~0.015 to ~ 0.095°C a-1. The greatest rate of temperature increase was for sites having MGTs slightly above 0°C. The lowest rate of increase was for marginal permafrost sites that are affected by latent heat exchange close to 0°C. Increased snow depths and an increase in winter air temperatures appear to be the most important factors controlling warming observed over the ten-year period. Geophysical surveys performed in 1999 to delineate the altitudinal limit of mountain permafrost were repeated in 2009 and 2010 and indicated the degradation of some permafrost over the intervening decade.
author Isaksen, Ketil
Ødegård, Rune Strand
Etzelmüller, Bernd
Hilbich, Christin
Hauck, Christian
Farbrot, Herman
Eiken, Trond
Hygen, Hans Olav
Hipp, Tobias Florian
spellingShingle Isaksen, Ketil
Ødegård, Rune Strand
Etzelmüller, Bernd
Hilbich, Christin
Hauck, Christian
Farbrot, Herman
Eiken, Trond
Hygen, Hans Olav
Hipp, Tobias Florian
Degrading mountain permafrost in southern Norway: spatial and temporal variability of mean ground temperatures, 1999–2009
author_facet Isaksen, Ketil
Ødegård, Rune Strand
Etzelmüller, Bernd
Hilbich, Christin
Hauck, Christian
Farbrot, Herman
Eiken, Trond
Hygen, Hans Olav
Hipp, Tobias Florian
author_sort Isaksen, Ketil
title Degrading mountain permafrost in southern Norway: spatial and temporal variability of mean ground temperatures, 1999–2009
title_short Degrading mountain permafrost in southern Norway: spatial and temporal variability of mean ground temperatures, 1999–2009
title_full Degrading mountain permafrost in southern Norway: spatial and temporal variability of mean ground temperatures, 1999–2009
title_fullStr Degrading mountain permafrost in southern Norway: spatial and temporal variability of mean ground temperatures, 1999–2009
title_full_unstemmed Degrading mountain permafrost in southern Norway: spatial and temporal variability of mean ground temperatures, 1999–2009
title_sort degrading mountain permafrost in southern norway: spatial and temporal variability of mean ground temperatures, 1999–2009
publishDate 2012
url http://doc.rero.ch/record/28729/files/hau_dmp.pdf
long_lat ENVELOPE(13.500,13.500,79.000,79.000)
geographic Dovrefjell
Norway
geographic_facet Dovrefjell
Norway
genre Dovrefjell
permafrost
genre_facet Dovrefjell
permafrost
op_relation http://doc.rero.ch/record/28729/files/hau_dmp.pdf
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