Geophysical mapping of palsa peatland permafrost
2015 (English)In: The Cryosphere, ISSN 1994-0416, E-ISSN 1994-0424, Vol. 9, 465-478 p.Article in journal (Refereed) Published
Permafrost peatlands are hydrological and biogeochemicalhotspots in the discontinuous permafrost zone.Non-intrusive geophysical methods offer a possibility tomap current permafrost spatial distributions in these environments.In this study, we estimate the depths to the permafrosttable and base across a peatland in northern Sweden,using ground penetrating radar and electrical resistivitytomography. Seasonal thaw frost tables (at 0.5m depth),taliks (2.1–6.7m deep), and the permafrost base (at 16mdepth) could be detected. Higher occurrences of taliks werediscovered at locations with a lower relative height of permafrostlandforms, which is indicative of lower ground icecontent at these locations. These results highlight the addedvalue of combining geophysical techniques for assessing spatialdistributions of permafrost within the rapidly changingsporadic permafrost zone. For example, based on a back-ofthe-envelope calculation for the site considered here, we estimatedthat the permafrost could thaw completely within thenext 3 centuries. Thus there is a clear need to benchmark currentpermafrost distributions and characteristics, particularlyin under studied regions of the pan-Arctic.
Place, publisher, year, edition, pages
2015. Vol. 9, 465-478 p.
permafrost, ground penetrating radar, electrical resistivity tomography
Other Earth and Related Environmental Sciences
Research subject Physical Geography
IdentifiersURN: urn:nbn:se:su:diva-115888DOI: 10.5194/tc-9-465-2015ISI: 000353878400004OAI: oai:DiVA.org:su-115888DiVA: diva2:800718