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High-resolution bathymetric mapping reveals subaqueous glacial landforms in the Arctic alpine lake Tarfala, Sweden
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. Stockholm Univ, Dept Phys Geog, Stockholm, Sweden.;Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden. (Ctr Naval Architecture)
Univ Ctr Svalbard, Dept Arctic Geol, Longyearbyen, Norway..
Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden. (Ctr Naval Architecture)ORCID iD: 0000-0003-3337-1900
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. (Ctr Naval Architecture)
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2019 (English)In: Journal of Quaternary Science, ISSN 0267-8179, E-ISSN 1099-1417Article in journal (Refereed) Epub ahead of print
Abstract [en]

In Arctic alpine regions, glacio-lacustrine environments respond sensitively to variations in climate conditions, impacting, for example,glacier extent and rendering former ice-contact lakes into ice distal lakes and vice versa. Lakefloors may hold morphological records of past glacier extent, but remoteness and long periods of ice cover on such lakes make acquisition of high-resolution bathymetric datasets challenging. Lake Tarfala and Kebnepakte Glacier, located in the Kebnekaise mountains, northern Sweden, comprise a small, dynamic glacio-lacustrine system holding a climate archive that is not well studied. Using an autonomous surface vessel, a high-resolution bathymetric dataset for Lake Tarfala was acquired in 2016, from which previously undiscovered end moraines and a potential grounding line feature were identified. For Kebnepakte Glacier, structure-from-motion photogrammetry was used to reconstruct its shape from photographs taken in 1910 and 1945. Combining these methods connects the glacial landform record identified at the lakefloor with the centennial-scale dynamic behaviour of Kebnepakte Glacier. During its maximum 20(th) century extent, attained c. 1910, Kebnepakte Glacier reached far into Lake Tarfala, but had retreated onto land by 1945, at an average of 7.9 m year(-1).

Place, publisher, year, edition, pages
Wiley , 2019.
Keywords [en]
autonomous, bathymetry, glacial lake, glacial landform, Tarfala
National Category
Geosciences, Multidisciplinary
Identifiers
URN: urn:nbn:se:kth:diva-257653DOI: 10.1002/jqs.3112ISI: 000480366900001OAI: oai:DiVA.org:kth-257653DiVA, id: diva2:1347988
Note

QC 20190903

Available from: 2019-09-03 Created: 2019-09-03 Last updated: 2019-09-03Bibliographically approved

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Kirchner, NinaStrandell Erstorp, Elias

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