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Cryogenic Soil Activity along Bioclimatic Gradients in Northern Sweden: Insights from Eight Different Proxies
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2013 (English)In: Permafrost and Periglacial Processes, ISSN 1045-6740, E-ISSN 1099-1530, Vol. 24, no 3, p. 210-223Article in journal (Refereed) Published
Abstract [en]

Cryogenic soil activity caused by differential soil movements during freeze-thaw cycles is of fundamental importance for Arctic ecosystem functioning, but its response to climate warming is uncertain. Eight proxies of cryogenic soil activity (including measurements of soil surface motion, vegetation and grey values of aerial photographs) were examined at eight study sites where non-sorted patterned ground spans an elevation gradient (400–1150 m asl) and a precipitation gradient (300–1000 mm yr-1) near Abisko, northern Sweden. Six proxies were significantly correlated with each other (mean |r| = 0.5). Soil surface motion increased by three to five times along the precipitation gradient and was two to four times greater at intermediate elevations than at low and high elevations, a pattern reflected by vegetation assemblages. The results suggest that inferences about how cryogenic soil activity changes with climate are independent of the choice of the proxy, although some proxies should be applied carefully. Four preferred proxies indicate that cryogenic soil activity may respond differently to climate warming along the elevation gradient and could be greatly modified by precipitation. This underlines the strong but spatially complex response of cryogenic processes to climate change in the Arctic. Copyright © 2013 John Wiley & Sons, Ltd.

Place, publisher, year, edition, pages
2013. Vol. 24, no 3, p. 210-223
Keywords [en]
periglacial geomorphology, climosequence, cryoturbation, differential frost heave, non-sorted circle, soil disturbance
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:polar:diva-4234DOI: 10.1002/ppp.1778OAI: oai:DiVA.org:polar-4234DiVA, id: diva2:1179093
Available from: 2018-01-31 Created: 2018-01-31 Last updated: 2018-01-31

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