Main results of permafrost monitoring in the French Alps through the PermaFrance network over the period 2010–2022
Abstract This study presents data from the first years of permafrost monitoring in boreholes in the French Alps that started at the end of 2009 in the framework of the PermaFrance network. Nine boreholes are instrumented, among which six monitored permafrost temperature and active layer thickness (A...
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Online Access: | http://dx.doi.org/10.1002/ppp.2209 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2209 |
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crwiley:10.1002/ppp.2209 2024-09-30T14:21:34+00:00 Main results of permafrost monitoring in the French Alps through the PermaFrance network over the period 2010–2022 Magnin, Florence Ravanel, Ludovic Bodin, Xavier Deline, Philip Malet, Emmanuel Krysiecki, Jean‐Michel Schoeneich, Philippe 2023 http://dx.doi.org/10.1002/ppp.2209 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2209 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Permafrost and Periglacial Processes volume 35, issue 1, page 3-23 ISSN 1045-6740 1099-1530 journal-article 2023 crwiley https://doi.org/10.1002/ppp.2209 2024-09-11T04:17:42Z Abstract This study presents data from the first years of permafrost monitoring in boreholes in the French Alps that started at the end of 2009 in the framework of the PermaFrance network. Nine boreholes are instrumented, among which six monitored permafrost temperature and active layer thickness (ALT) over >10 years. Ice‐poor and cold permafrost in high‐elevation north‐facing rock walls has warmed by up to >1°C at 10 m depth over the reference decade (2011–2020), whereas ice‐rich permafrost (rock glacier) temperatures remained stable. ALT has increased at four of the five boreholes for which decadal data are available. Summer 2015 marks a turning point in ALT regime and greatest ALT values were observed in 2022 (available for six boreholes), but thawing intensity did not show an obvious change. At one site with a layer of coarse blocks about 2 m thick, ALT was stable over 2018–2022 and response to the hottest years was dampened. Linear trends suggest an ALT increase of 2 m per decade for some ice‐poor rock walls, independently of their thermal state. The data reveal a variety of permafrost patterns and evolution with significant intraregional and local differences. Snow modulates the response to air temperature signal in various ways, with an important effect on near‐surface temperature trends and ALT: early snow melting in spring favors an ALT increase in rock walls. Maintaining these monitoring systems and understanding the physical processes controlling heterogeneous responses to climate signals is crucial to better assess permafrost dynamics and to adapt to its consequences. Article in Journal/Newspaper Active layer thickness Ice permafrost Permafrost and Periglacial Processes Wiley Online Library Permafrost and Periglacial Processes 35 1 3 23 |
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English |
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Abstract This study presents data from the first years of permafrost monitoring in boreholes in the French Alps that started at the end of 2009 in the framework of the PermaFrance network. Nine boreholes are instrumented, among which six monitored permafrost temperature and active layer thickness (ALT) over >10 years. Ice‐poor and cold permafrost in high‐elevation north‐facing rock walls has warmed by up to >1°C at 10 m depth over the reference decade (2011–2020), whereas ice‐rich permafrost (rock glacier) temperatures remained stable. ALT has increased at four of the five boreholes for which decadal data are available. Summer 2015 marks a turning point in ALT regime and greatest ALT values were observed in 2022 (available for six boreholes), but thawing intensity did not show an obvious change. At one site with a layer of coarse blocks about 2 m thick, ALT was stable over 2018–2022 and response to the hottest years was dampened. Linear trends suggest an ALT increase of 2 m per decade for some ice‐poor rock walls, independently of their thermal state. The data reveal a variety of permafrost patterns and evolution with significant intraregional and local differences. Snow modulates the response to air temperature signal in various ways, with an important effect on near‐surface temperature trends and ALT: early snow melting in spring favors an ALT increase in rock walls. Maintaining these monitoring systems and understanding the physical processes controlling heterogeneous responses to climate signals is crucial to better assess permafrost dynamics and to adapt to its consequences. |
format |
Article in Journal/Newspaper |
author |
Magnin, Florence Ravanel, Ludovic Bodin, Xavier Deline, Philip Malet, Emmanuel Krysiecki, Jean‐Michel Schoeneich, Philippe |
spellingShingle |
Magnin, Florence Ravanel, Ludovic Bodin, Xavier Deline, Philip Malet, Emmanuel Krysiecki, Jean‐Michel Schoeneich, Philippe Main results of permafrost monitoring in the French Alps through the PermaFrance network over the period 2010–2022 |
author_facet |
Magnin, Florence Ravanel, Ludovic Bodin, Xavier Deline, Philip Malet, Emmanuel Krysiecki, Jean‐Michel Schoeneich, Philippe |
author_sort |
Magnin, Florence |
title |
Main results of permafrost monitoring in the French Alps through the PermaFrance network over the period 2010–2022 |
title_short |
Main results of permafrost monitoring in the French Alps through the PermaFrance network over the period 2010–2022 |
title_full |
Main results of permafrost monitoring in the French Alps through the PermaFrance network over the period 2010–2022 |
title_fullStr |
Main results of permafrost monitoring in the French Alps through the PermaFrance network over the period 2010–2022 |
title_full_unstemmed |
Main results of permafrost monitoring in the French Alps through the PermaFrance network over the period 2010–2022 |
title_sort |
main results of permafrost monitoring in the french alps through the permafrance network over the period 2010–2022 |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/ppp.2209 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2209 |
genre |
Active layer thickness Ice permafrost Permafrost and Periglacial Processes |
genre_facet |
Active layer thickness Ice permafrost Permafrost and Periglacial Processes |
op_source |
Permafrost and Periglacial Processes volume 35, issue 1, page 3-23 ISSN 1045-6740 1099-1530 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/ppp.2209 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
35 |
container_issue |
1 |
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3 |
op_container_end_page |
23 |
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1811636074877812736 |