Non‐Invasive Geophysical Investigation and Thermodynamic Analysis of a Palsa in Lapland, Northwest Finland
Non‐invasive geophysical prospecting and a thermodynamic model were used to examine the structure, depth and lateral extent of the frozen core of a palsa near Lake Peerajärvi in northwest Finland. A simple thermodynamic model verified that the current climatic conditions in the study area allow sust...
Published in: | Permafrost and Periglacial Processes |
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Online Access: | https://doi.org/10.1002/ppp.1798 |
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ftrepec:oai:RePEc:wly:perpro:v:25:y:2014:i:1:p:45-52 2023-05-15T15:06:37+02:00 Non‐Invasive Geophysical Investigation and Thermodynamic Analysis of a Palsa in Lapland, Northwest Finland Tomas Kohout Michał S. Bućko Kai Rasmus Matti Leppäranta Ilkka Matero https://doi.org/10.1002/ppp.1798 unknown https://doi.org/10.1002/ppp.1798 article ftrepec https://doi.org/10.1002/ppp.1798 2020-12-04T13:31:03Z Non‐invasive geophysical prospecting and a thermodynamic model were used to examine the structure, depth and lateral extent of the frozen core of a palsa near Lake Peerajärvi in northwest Finland. A simple thermodynamic model verified that the current climatic conditions in the study area allow sustainable palsa development. A ground penetrating radar (GPR) survey of the palsa under both winter and summer conditions revealed its internal structure and the size of its frozen core. GPR imaging in summer detected the upper peat/core boundary, and imaging in winter detected a deep reflector that probably represents the lower core boundary. This indicates that only a combined summer and winter GPR survey completely reveals the lateral and vertical extent of the frozen core of the palsa. The core underlies the active layer at a depth of ~ 0.6 m and extends to about 4 m depth. Its lateral extent is ~ 15 m x ~ 30 m. The presence of the frozen core could also be traced as minima in surface temperature and ground conductivity measurements. These field methods and thermodynamic models can be utilised in studies of climate impact on Arctic wetlands. Copyright © 2014 John Wiley & Sons, Ltd. Article in Journal/Newspaper Arctic palsa Lapland RePEc (Research Papers in Economics) Arctic Peerajärvi ENVELOPE(21.092,21.092,68.888,68.888) Permafrost and Periglacial Processes 25 1 45 52 |
institution |
Open Polar |
collection |
RePEc (Research Papers in Economics) |
op_collection_id |
ftrepec |
language |
unknown |
description |
Non‐invasive geophysical prospecting and a thermodynamic model were used to examine the structure, depth and lateral extent of the frozen core of a palsa near Lake Peerajärvi in northwest Finland. A simple thermodynamic model verified that the current climatic conditions in the study area allow sustainable palsa development. A ground penetrating radar (GPR) survey of the palsa under both winter and summer conditions revealed its internal structure and the size of its frozen core. GPR imaging in summer detected the upper peat/core boundary, and imaging in winter detected a deep reflector that probably represents the lower core boundary. This indicates that only a combined summer and winter GPR survey completely reveals the lateral and vertical extent of the frozen core of the palsa. The core underlies the active layer at a depth of ~ 0.6 m and extends to about 4 m depth. Its lateral extent is ~ 15 m x ~ 30 m. The presence of the frozen core could also be traced as minima in surface temperature and ground conductivity measurements. These field methods and thermodynamic models can be utilised in studies of climate impact on Arctic wetlands. Copyright © 2014 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Tomas Kohout Michał S. Bućko Kai Rasmus Matti Leppäranta Ilkka Matero |
spellingShingle |
Tomas Kohout Michał S. Bućko Kai Rasmus Matti Leppäranta Ilkka Matero Non‐Invasive Geophysical Investigation and Thermodynamic Analysis of a Palsa in Lapland, Northwest Finland |
author_facet |
Tomas Kohout Michał S. Bućko Kai Rasmus Matti Leppäranta Ilkka Matero |
author_sort |
Tomas Kohout |
title |
Non‐Invasive Geophysical Investigation and Thermodynamic Analysis of a Palsa in Lapland, Northwest Finland |
title_short |
Non‐Invasive Geophysical Investigation and Thermodynamic Analysis of a Palsa in Lapland, Northwest Finland |
title_full |
Non‐Invasive Geophysical Investigation and Thermodynamic Analysis of a Palsa in Lapland, Northwest Finland |
title_fullStr |
Non‐Invasive Geophysical Investigation and Thermodynamic Analysis of a Palsa in Lapland, Northwest Finland |
title_full_unstemmed |
Non‐Invasive Geophysical Investigation and Thermodynamic Analysis of a Palsa in Lapland, Northwest Finland |
title_sort |
non‐invasive geophysical investigation and thermodynamic analysis of a palsa in lapland, northwest finland |
url |
https://doi.org/10.1002/ppp.1798 |
long_lat |
ENVELOPE(21.092,21.092,68.888,68.888) |
geographic |
Arctic Peerajärvi |
geographic_facet |
Arctic Peerajärvi |
genre |
Arctic palsa Lapland |
genre_facet |
Arctic palsa Lapland |
op_relation |
https://doi.org/10.1002/ppp.1798 |
op_doi |
https://doi.org/10.1002/ppp.1798 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
25 |
container_issue |
1 |
container_start_page |
45 |
op_container_end_page |
52 |
_version_ |
1766338187806900224 |