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Effects of short-term variability of meteorological variables on soil temperature in permafrost regions
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry. Bjerknes Centre for Climate Research, Norway.
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
Number of Authors: 42018 (English)In: The Cryosphere, ISSN 1994-0416, E-ISSN 1994-0424, Vol. 12, no 2, p. 741-757Article in journal (Refereed) Published
Abstract [en]

Effects of the short-term temporal variability of meteorological variables on soil temperature in northern high-latitude regions have been investigated. For this, a process-oriented land surface model has been driven using an artificially manipulated climate dataset. Short-term climate variability mainly impacts snow depth, and the thermal diffusivity of lichens and bryophytes. These impacts of climate variability on insulating surface layers together substantially alter the heat exchange between atmosphere and soil. As a result, soil temperature is 0.1 to 0.8 degrees C higher when climate variability is reduced. Earth system models project warming of the Arctic region but also increasing variability of meteorological variables and more often extreme meteorological events. Therefore, our results show that projected future increases in permafrost temperature and active-layer thickness in response to climate change will be lower (i) when taking into account future changes in short-term variability of meteorological variables and (ii) when representing dynamic snow and lichen and bryophyte functions in land surface models.

Place, publisher, year, edition, pages
2018. Vol. 12, no 2, p. 741-757
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-154812DOI: 10.5194/tc-12-741-2018ISI: 000426627500001OAI: oai:DiVA.org:su-154812DiVA, id: diva2:1197529
Available from: 2018-04-13 Created: 2018-04-13 Last updated: 2018-04-13Bibliographically approved

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