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| Titel |
Geophysical mapping of palsa peatland permafrost |
| VerfasserIn |
Y. Sjöberg, P. Marklund, R. Pettersson, S. W. Lyon |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 9, no. 2 ; Nr. 9, no. 2 (2015-03-04), S.465-478 |
| Datensatznummer |
250116763
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| Publikation (Nr.) |
 copernicus.org/tc-9-465-2015.pdf |
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| Zusammenfassung |
| Permafrost peatlands are hydrological and biogeochemical hotspots in the
discontinuous permafrost zone. Non-intrusive geophysical methods offer a
possibility to map current permafrost spatial distributions in these
environments. In this study, we estimate the depths to the permafrost table
and base across a peatland in northern Sweden, using ground penetrating
radar and electrical resistivity tomography. Seasonal thaw frost tables (at
~0.5 m depth), taliks (2.1–6.7 m deep), and the permafrost
base (at ~16 m depth) could be detected. Higher occurrences
of taliks were discovered at locations with a lower relative height of
permafrost landforms, which is indicative of lower ground ice content at these
locations. These results highlight the added value of combining geophysical
techniques for assessing spatial distributions of permafrost within the
rapidly changing sporadic permafrost zone. For example, based on a
back-of-the-envelope calculation for the site considered here, we estimated
that the permafrost could thaw completely within the next 3
centuries. Thus there is a clear need to benchmark current permafrost
distributions and characteristics, particularly in under studied regions of
the pan-Arctic. |
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