Shallow active layer temperature and DC resistivity of a rock glacier in the Argentera Massif, Maritime Alps, Italy
A monitoring of shallow active layer temperature and DC resistivity soundings were performed in the Portette rock glacier, in a region which is considered the southern boundary of permafrost existence in the European Alps. The aim of the work is to recognize the most important seasonal processes tha...
Published in: | Zeitschrift für Geomorphologie, Supplementary Issues |
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Online Access: | http://hdl.handle.net/11568/111352 https://doi.org/10.1127/0372-8854/2007/0051S2-0055 |
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ftunivpisairis:oai:arpi.unipi.it:11568/111352 2024-04-21T07:43:34+00:00 Shallow active layer temperature and DC resistivity of a rock glacier in the Argentera Massif, Maritime Alps, Italy RIBOLINI, ADRIANO FABRE D. Ribolini, Adriano Fabre, D. 2007 STAMPA http://hdl.handle.net/11568/111352 https://doi.org/10.1127/0372-8854/2007/0051S2-0055 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000252082900005 volume:51 firstpage:55 lastpage:77 numberofpages:23 journal:ZEITSCHRIFT FÜR GEOMORPHOLOGIE http://hdl.handle.net/11568/111352 doi:10.1127/0372-8854/2007/0051S2-0055 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84903415239 permafrost thermal regime geoelectrical resistivity Argentera Massif info:eu-repo/semantics/article 2007 ftunivpisairis https://doi.org/10.1127/0372-8854/2007/0051S2-0055 2024-03-28T01:24:35Z A monitoring of shallow active layer temperature and DC resistivity soundings were performed in the Portette rock glacier, in a region which is considered the southern boundary of permafrost existence in the European Alps. The aim of the work is to recognize the most important seasonal processes that condition the existence or thaw of the permafrost. A one-dimensional geo-electrical survey was adopted to define the permafrost thickness. The active layer temperature was monitored hourly for four years using a digital data logger and a thermistor placed at 20 cm depth. The active layer temperature of three other rock glaciers in the surrounding area was monitored at the same depth and using the same instrumentation. The observed resistivities exceeding 100 k Omega m have been interpreted as permafrost affected layers, in accordance with other active rock glaciers in the Southwestern Alps. The thickness of the permafrost layer exceeds tens of metres both in the upper and middle part of the Portette rock glacier. The thermal behaviour of the active layer is strongly characterized by the occurrence of non-conductive and seasonal heat transfer processes, i.e. release of latent heat during phase change, snow melt infiltration and evidence of air circulation. Thermal events associated with these processes were synchronously registered in the shallow active layers of the other three rock glaciers, evidencing a common thermal behaviour of the Argentera rock glacier during the monitoring period. The ground-air temperature coupling/decoupling indicates that the thickness and establishment of snow cover strongly regulates the occurrence and intensity of these seasonal processes. Delayed and thin snow cover in autumn represents a forcing factor for permafrost maintenance/aggradation because it allows i) a strong cold penetration into the ground, ii) a lack/reduction of the Zero Curtain effect and iii) a downward cold and dense air funnelling. The comparison of the results with regional climatic data indicates that in the ... Article in Journal/Newspaper Active layer temperature permafrost ARPI - Archivio della Ricerca dell'Università di Pisa Zeitschrift für Geomorphologie, Supplementary Issues 51 2 55 77 |
institution |
Open Polar |
collection |
ARPI - Archivio della Ricerca dell'Università di Pisa |
op_collection_id |
ftunivpisairis |
language |
English |
topic |
permafrost thermal regime geoelectrical resistivity Argentera Massif |
spellingShingle |
permafrost thermal regime geoelectrical resistivity Argentera Massif RIBOLINI, ADRIANO FABRE D. Shallow active layer temperature and DC resistivity of a rock glacier in the Argentera Massif, Maritime Alps, Italy |
topic_facet |
permafrost thermal regime geoelectrical resistivity Argentera Massif |
description |
A monitoring of shallow active layer temperature and DC resistivity soundings were performed in the Portette rock glacier, in a region which is considered the southern boundary of permafrost existence in the European Alps. The aim of the work is to recognize the most important seasonal processes that condition the existence or thaw of the permafrost. A one-dimensional geo-electrical survey was adopted to define the permafrost thickness. The active layer temperature was monitored hourly for four years using a digital data logger and a thermistor placed at 20 cm depth. The active layer temperature of three other rock glaciers in the surrounding area was monitored at the same depth and using the same instrumentation. The observed resistivities exceeding 100 k Omega m have been interpreted as permafrost affected layers, in accordance with other active rock glaciers in the Southwestern Alps. The thickness of the permafrost layer exceeds tens of metres both in the upper and middle part of the Portette rock glacier. The thermal behaviour of the active layer is strongly characterized by the occurrence of non-conductive and seasonal heat transfer processes, i.e. release of latent heat during phase change, snow melt infiltration and evidence of air circulation. Thermal events associated with these processes were synchronously registered in the shallow active layers of the other three rock glaciers, evidencing a common thermal behaviour of the Argentera rock glacier during the monitoring period. The ground-air temperature coupling/decoupling indicates that the thickness and establishment of snow cover strongly regulates the occurrence and intensity of these seasonal processes. Delayed and thin snow cover in autumn represents a forcing factor for permafrost maintenance/aggradation because it allows i) a strong cold penetration into the ground, ii) a lack/reduction of the Zero Curtain effect and iii) a downward cold and dense air funnelling. The comparison of the results with regional climatic data indicates that in the ... |
author2 |
Ribolini, Adriano Fabre, D. |
format |
Article in Journal/Newspaper |
author |
RIBOLINI, ADRIANO FABRE D. |
author_facet |
RIBOLINI, ADRIANO FABRE D. |
author_sort |
RIBOLINI, ADRIANO |
title |
Shallow active layer temperature and DC resistivity of a rock glacier in the Argentera Massif, Maritime Alps, Italy |
title_short |
Shallow active layer temperature and DC resistivity of a rock glacier in the Argentera Massif, Maritime Alps, Italy |
title_full |
Shallow active layer temperature and DC resistivity of a rock glacier in the Argentera Massif, Maritime Alps, Italy |
title_fullStr |
Shallow active layer temperature and DC resistivity of a rock glacier in the Argentera Massif, Maritime Alps, Italy |
title_full_unstemmed |
Shallow active layer temperature and DC resistivity of a rock glacier in the Argentera Massif, Maritime Alps, Italy |
title_sort |
shallow active layer temperature and dc resistivity of a rock glacier in the argentera massif, maritime alps, italy |
publishDate |
2007 |
url |
http://hdl.handle.net/11568/111352 https://doi.org/10.1127/0372-8854/2007/0051S2-0055 |
genre |
Active layer temperature permafrost |
genre_facet |
Active layer temperature permafrost |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000252082900005 volume:51 firstpage:55 lastpage:77 numberofpages:23 journal:ZEITSCHRIFT FÜR GEOMORPHOLOGIE http://hdl.handle.net/11568/111352 doi:10.1127/0372-8854/2007/0051S2-0055 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84903415239 |
op_doi |
https://doi.org/10.1127/0372-8854/2007/0051S2-0055 |
container_title |
Zeitschrift für Geomorphologie, Supplementary Issues |
container_volume |
51 |
container_issue |
2 |
container_start_page |
55 |
op_container_end_page |
77 |
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