Air and Ground Temperature Variations Observed along Elevation and Continentality Gradients in Southern Norway
ABSTRACT The coupling between air and ground temperatures in the mountains of southern Norway was examined using 12 shallow boreholes drilled in August 2008. Three borehole arrays (at Juvvass, Jetta and Tron), each with boreholes at different elevations, were established along a continentality gradi...
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crwiley:10.1002/ppp.733 2024-09-15T18:29:40+00:00 Air and Ground Temperature Variations Observed along Elevation and Continentality Gradients in Southern Norway Farbrot, Herman Hipp, Tobias Florian Etzelmüller, Bernd Isaksen, Ketil Ødegård, Rune Strand Schuler, Thomas Vikhamar Humlum, Ole Norwegian Research Council Department of Geosciences, University of Oslo 2011 http://dx.doi.org/10.1002/ppp.733 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.733 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.733 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 22, issue 4, page 343-360 ISSN 1045-6740 1099-1530 journal-article 2011 crwiley https://doi.org/10.1002/ppp.733 2024-08-06T04:12:57Z ABSTRACT The coupling between air and ground temperatures in the mountains of southern Norway was examined using 12 shallow boreholes drilled in August 2008. Three borehole arrays (at Juvvass, Jetta and Tron), each with boreholes at different elevations, were established along a continentality gradient. At the least continental site (Juvvass), the transect includes boreholes with shallow seasonal frost to continuous permafrost, while at Jetta and Tron, the arrays covered the transition from relatively deep seasonal frost to marginal permafrost. On the north slope of Tron, however, ground surface temperatures indicate more widespread permafrost conditions, apparently due to the negative thermal anomaly associated with an openwork block field. The surface offsets (mean ground surface temperature (MGST) minus mean air temperature (MAT)) ranged from < 1 °C for unvegetated wind‐scoured sites to up to 4.5 °C for sites with a thick, prolonged snow cover. Active‐layer thicknesses at the borehole sites close to the lower limit of mountain permafrost were up to 10 m in bedrock, even under a low thermal diffusivity sediment cover. The mean ground temperature at 10‐m depth differed significantly from the MGST, mainly due to the 3D thermal effects of the varying snow cover. Our air temperature measurements do not support the inference that the observed decrease in the lower elevational limit of mountain permafrost with continentality is mainly due to lower MAT. Rather, the pattern fits with an eastwards decrease in the lower limit of block fields and snowfall amounts. Copyright © 2011 John Wiley & Sons, Ltd. Article in Journal/Newspaper permafrost Permafrost and Periglacial Processes Wiley Online Library Permafrost and Periglacial Processes 22 4 343 360 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
ABSTRACT The coupling between air and ground temperatures in the mountains of southern Norway was examined using 12 shallow boreholes drilled in August 2008. Three borehole arrays (at Juvvass, Jetta and Tron), each with boreholes at different elevations, were established along a continentality gradient. At the least continental site (Juvvass), the transect includes boreholes with shallow seasonal frost to continuous permafrost, while at Jetta and Tron, the arrays covered the transition from relatively deep seasonal frost to marginal permafrost. On the north slope of Tron, however, ground surface temperatures indicate more widespread permafrost conditions, apparently due to the negative thermal anomaly associated with an openwork block field. The surface offsets (mean ground surface temperature (MGST) minus mean air temperature (MAT)) ranged from < 1 °C for unvegetated wind‐scoured sites to up to 4.5 °C for sites with a thick, prolonged snow cover. Active‐layer thicknesses at the borehole sites close to the lower limit of mountain permafrost were up to 10 m in bedrock, even under a low thermal diffusivity sediment cover. The mean ground temperature at 10‐m depth differed significantly from the MGST, mainly due to the 3D thermal effects of the varying snow cover. Our air temperature measurements do not support the inference that the observed decrease in the lower elevational limit of mountain permafrost with continentality is mainly due to lower MAT. Rather, the pattern fits with an eastwards decrease in the lower limit of block fields and snowfall amounts. Copyright © 2011 John Wiley & Sons, Ltd. |
author2 |
Norwegian Research Council Department of Geosciences, University of Oslo |
format |
Article in Journal/Newspaper |
author |
Farbrot, Herman Hipp, Tobias Florian Etzelmüller, Bernd Isaksen, Ketil Ødegård, Rune Strand Schuler, Thomas Vikhamar Humlum, Ole |
spellingShingle |
Farbrot, Herman Hipp, Tobias Florian Etzelmüller, Bernd Isaksen, Ketil Ødegård, Rune Strand Schuler, Thomas Vikhamar Humlum, Ole Air and Ground Temperature Variations Observed along Elevation and Continentality Gradients in Southern Norway |
author_facet |
Farbrot, Herman Hipp, Tobias Florian Etzelmüller, Bernd Isaksen, Ketil Ødegård, Rune Strand Schuler, Thomas Vikhamar Humlum, Ole |
author_sort |
Farbrot, Herman |
title |
Air and Ground Temperature Variations Observed along Elevation and Continentality Gradients in Southern Norway |
title_short |
Air and Ground Temperature Variations Observed along Elevation and Continentality Gradients in Southern Norway |
title_full |
Air and Ground Temperature Variations Observed along Elevation and Continentality Gradients in Southern Norway |
title_fullStr |
Air and Ground Temperature Variations Observed along Elevation and Continentality Gradients in Southern Norway |
title_full_unstemmed |
Air and Ground Temperature Variations Observed along Elevation and Continentality Gradients in Southern Norway |
title_sort |
air and ground temperature variations observed along elevation and continentality gradients in southern norway |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1002/ppp.733 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.733 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.733 |
genre |
permafrost Permafrost and Periglacial Processes |
genre_facet |
permafrost Permafrost and Periglacial Processes |
op_source |
Permafrost and Periglacial Processes volume 22, issue 4, page 343-360 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.733 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
22 |
container_issue |
4 |
container_start_page |
343 |
op_container_end_page |
360 |
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1810471092183105536 |