Non-invasive geophysical investigation and thermodynamic analysis of a palsa in Lapland, northwest Finland

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http://hdl.handle.net/10138/43168

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Kohout , T , Bucko , M , Rasmus , K , Leppäranta , M & Matero , I 2014 , ' Non-invasive geophysical investigation and thermodynamic analysis of a palsa in Lapland, northwest Finland ' , Permafrost and Periglacial Processes , vol. 25 , pp. 45-52 . https://doi.org/10.1002/ppp.1798

Title: Non-invasive geophysical investigation and thermodynamic analysis of a palsa in Lapland, northwest Finland
Author: Kohout, Tomas; Bucko, Michal; Rasmus, Kai; Leppäranta, Matti; Matero, Ilkka
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2014
Language: eng
Number of pages: 8
Belongs to series: Permafrost and Periglacial Processes
ISSN: 1045-6740
URI: http://hdl.handle.net/10138/43168
Abstract: 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 utilized in studies of climate impact on Arctic wetlands.
Subject: 114 Physical sciences
GEOPHYSICS
GPR
thermodynamics
1171 Geosciences
PALSA
PERMAFROST
THERMODYNAMICS
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