Spatial analysis of the French Pleistocene permafrost by a GIS database
GIS analysis of the French database of Pleistocene periglacial features allows an improved evaluation of the maximum extent of past permafrost. The distribution of typical ice‐wedge pseudomorphs does not extend south of 47°N and therefore suggests that widespread discontinuous permafrost did not aff...
Published in: | Permafrost and Periglacial Processes |
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Online Access: | https://doi.org/10.1002/ppp.1856 |
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ftrepec:oai:RePEc:wly:perpro:v:27:y:2016:i:1:p:17-30 2023-05-15T16:36:47+02:00 Spatial analysis of the French Pleistocene permafrost by a GIS database Eric Andrieux Pascal Bertran Kazuyuki Saito https://doi.org/10.1002/ppp.1856 unknown https://doi.org/10.1002/ppp.1856 article ftrepec https://doi.org/10.1002/ppp.1856 2020-12-04T13:31:25Z GIS analysis of the French database of Pleistocene periglacial features allows an improved evaluation of the maximum extent of past permafrost. The distribution of typical ice‐wedge pseudomorphs does not extend south of 47°N and therefore suggests that widespread discontinuous permafrost did not affect the regions south of the Paris Basin. The exclusive presence of sand wedges with primary infill between 45 and 47°N, mainly in the periphery of coversand areas, suggests that thermal contraction cracking of the ground occurred together with sand drifting in a context of deep seasonal frost or sporadic discontinuous permafrost, unfavourable for the growth of significant ground‐ice bodies. The latitudinal variation of the wedge dimensions clearly shows that the sand wedges were located in the southern margin of the area affected by thermal contraction. The proposed map of Pleistocene permafrost in France partially reconciles field data with palaeoclimatic simulations. The remaining discrepancies may arise primarily from the time lag between the Last Permafrost Maximum (c. 31–24 ka) and the Last Glacial Maximum (21 ka). Copyright © 2015 John Wiley & Sons, Ltd. Article in Journal/Newspaper Ice permafrost wedge* RePEc (Research Papers in Economics) Permafrost and Periglacial Processes 27 1 17 30 |
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Open Polar |
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RePEc (Research Papers in Economics) |
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ftrepec |
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unknown |
description |
GIS analysis of the French database of Pleistocene periglacial features allows an improved evaluation of the maximum extent of past permafrost. The distribution of typical ice‐wedge pseudomorphs does not extend south of 47°N and therefore suggests that widespread discontinuous permafrost did not affect the regions south of the Paris Basin. The exclusive presence of sand wedges with primary infill between 45 and 47°N, mainly in the periphery of coversand areas, suggests that thermal contraction cracking of the ground occurred together with sand drifting in a context of deep seasonal frost or sporadic discontinuous permafrost, unfavourable for the growth of significant ground‐ice bodies. The latitudinal variation of the wedge dimensions clearly shows that the sand wedges were located in the southern margin of the area affected by thermal contraction. The proposed map of Pleistocene permafrost in France partially reconciles field data with palaeoclimatic simulations. The remaining discrepancies may arise primarily from the time lag between the Last Permafrost Maximum (c. 31–24 ka) and the Last Glacial Maximum (21 ka). Copyright © 2015 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Eric Andrieux Pascal Bertran Kazuyuki Saito |
spellingShingle |
Eric Andrieux Pascal Bertran Kazuyuki Saito Spatial analysis of the French Pleistocene permafrost by a GIS database |
author_facet |
Eric Andrieux Pascal Bertran Kazuyuki Saito |
author_sort |
Eric Andrieux |
title |
Spatial analysis of the French Pleistocene permafrost by a GIS database |
title_short |
Spatial analysis of the French Pleistocene permafrost by a GIS database |
title_full |
Spatial analysis of the French Pleistocene permafrost by a GIS database |
title_fullStr |
Spatial analysis of the French Pleistocene permafrost by a GIS database |
title_full_unstemmed |
Spatial analysis of the French Pleistocene permafrost by a GIS database |
title_sort |
spatial analysis of the french pleistocene permafrost by a gis database |
url |
https://doi.org/10.1002/ppp.1856 |
genre |
Ice permafrost wedge* |
genre_facet |
Ice permafrost wedge* |
op_relation |
https://doi.org/10.1002/ppp.1856 |
op_doi |
https://doi.org/10.1002/ppp.1856 |
container_title |
Permafrost and Periglacial Processes |
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27 |
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1 |
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17 |
op_container_end_page |
30 |
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1766027105826504704 |