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(Article of periodic en Anglais - 2014)

Document title

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

Authors(s) and Affiliation(s)

KOHOUT T. (1 2) ; BUĆKO M.S. (1) ; RASMUS K. (3 4) ; LEPPÄRANTA M. (1) ; MATERO I. (1 5) ;
(1) Dept. of Physics, Univ., Helsinki, FINLANDE
(2) Inst. of Geology ASCR, Prague, TCHEQUE, REPUBLIQUE
(3) Luode Consulting Oy, Jyväskylä, FINLANDE
(4) SYKE. Freshwater Center, Jyväskylä, FINLANDE
(5) Finnish Meteorological Inst., Helsinki, FINLANDE

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. 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 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

Source

Article of periodic

published at : Permafrost and periglacial processes / ISSN 1045-6740 / CODEN PEPPED

Editor : Wiley, Chichester - ROYAUME-UNI (1990)

Millesime : 2014, vol. 25, no1 [pp. 45-52]

Bibliographic references : 25 ref.

Collation : 9 fig.

Language

Anglais

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/ppp.1798

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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