Details

Title

Modelling of the thermal regime of permafrost during 1990–2014 in Hornsund, Svalbard

Journal title

Polish Polar Research

Yearbook

2016

Volume

vol. 37

Numer

No 2

Publication authors

Keywords

Arctic ; Hornsund ; permafrost evolution ; Permafrost modelling ; Spitsbergen

Divisions of PAS

Nauki o Ziemi

Coverage

219-242

Abstract

The thermal state of permafrost is a crucial indicator of environmental changes occurring in the Arctic. The monitoring of ground temperatures in Svalbard has been carried out in instrumented boreholes, although only few are deeper than 10 m and none are located in southern part of Spitsbergen. Only one of them, Janssonhaugen, located in central part of the island, provides the ground temperature data down to 100 m. Recent studies have proved that significant warming of the ground surface temperatures, observed especially in the last three decades, can be detected not only just few meters below the surface, but reaches much deeper layers. The aim of this paper is evaluation of the permafrost state in the vicinity of the Polish Polar Station in Hornsund using the numerical heat transfer model CryoGrid 2. The model is calibrated with ground temperature data collected from a 2 m deep borehole established in 2013 and then validated with data from the period 1990-2014 from five depths up to 1 m, measured routinely at the Hornsund meteorological station. The study estimates modelled ground thermal profile down to 100 m in depth and presents the evolution of the ground thermal regime in the last 25 years. The simulated subsurface temperature trumpet shows that multiannual variability in that period can reach 25 m in depth. The changes of the ground thermal regime correspond to an increasing trend of air temperatures observed in Hornsund and general warming across Svalbard.

Publisher

Polish Academy of Sciences ; Committee on Polar Research

Date

2016

Type

Artykuły / Articles

Identifier

ISSN 0138-0338 ; eISSN 2081-8262

References

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DOI

10.1515/popore-2016-0013

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