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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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 |
_version_ |
1766397889121091584 |