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  • 1.
    Regnell, Carl
    et al.
    Stockholm Univ, Sweden; Geol Survey Sweden, Sweden.
    Becher, Gustaf Peterson
    Geol Survey Sweden, Sweden.
    Ohrling, Christian
    Geol Survey Sweden, Sweden.
    Greenwood, Sarah L.
    Stockholm Univ, Sweden.
    Gyllencreutz, Richard
    Stockholm Univ, Sweden.
    Blomdin, Robin
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten. Geol Survey Sweden, Sweden.
    Brendryen, Jo
    Univ Bergen, Norway.
    Goodfellow, Bradley W.
    Geol Survey Sweden, Sweden.
    Mikko, Henrik
    Geol Survey Sweden, Sweden.
    Ransed, Gunnel
    Geol Survey Sweden, Sweden.
    Smith, Colby
    Geol Survey Sweden, Sweden.
    Ice-dammed lakes and deglaciation history of the Scandinavian Ice Sheet in central Jaeuromtland, Sweden2023Ingår i: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 314, artikel-id 108219Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Extensive glacial lakes dammed in the Scandinavian Mountains during the retreat of the last Scandinavian Ice Sheet were first hypothesised over a century ago. Here, using high-resolution LiDAR, we report >4500 relict shorelines, deltas and palaeo-channels related to ice-dammed lakes over a -30 000 km2 area of central Jaeuromtland, west-central Sweden. Shorelines occur as flights on the valley sides, a consequence of sequential lowering of palaeo-lake levels during ice margin retreat and lower threshold outlets becoming ice-free. Based on the extent and elevation of shorelines, we identify requisite lake-damming ice-margin positions and lake drainage outlets, and we reconstruct the coupled evolution of ice-dammed lakes and the retreating ice margin. Beginning as a series of smaller ice-dammed lakes along the Swedish-Norwegian border, draining westward across the present-day water divide and into the Atlantic Ocean, the lakes successively coalesced during eastward ice margin retreat to form water bodies covering 1000s of km2 with 10s of km-long calving margins. Ultimately, the lake system coalesced into a single lake: the Central Jaeuromtland Ice Lake, which exceeded 3500 km2 in area and 360 km3 in volume. Eventually, the damming ice-margin split in two, resulting in a large (-200 km2) catastrophic glacial lake outburst flood (GLOF) that reversed the drainage of the entire lake system from the west to an eastern outlet draining to the Baltic basin. We present new radiocarbon ages for one lake drainage event prior to the eastward outburst flood and, together with previously published deglacial ages and local varve records, we suggest that the region was possibly deglaciated within just 350 years, sometime between 10.5 and 9.2 cal ka BP. We tentatively correlate the penultimate drainage of the Central Jaeuromtland Ice Lake to the zero-varve of the Swedish Time Scale, a drainage varve at Doeuroviken, eastern Jaeuromtland, raising the tantalising prospect of using the evolution of the ice-dammed lake system to tie the varve-based Swedish Time Scale to the radiocarbon timescale with a new programme of radiocarbon dating in central Jaeuromtland. & COPY; 2023 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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