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  • 1. Jakobsson, Martin
    et al.
    Björck, Svante
    Alm, Göran
    Andrén, Thomas
    Lindeberg, Greger
    Svensson, Nils-Olof
    Department of Geology, Quaternary Sciences, Lund University.
    Reconstructing the Younger Dryas ice dammed lake in the Baltic Basin: bathymetry, area and volume2007In: Global and Planetary Change, ISSN 0921-8181, E-ISSN 1872-6364, Vol. 57, no 3-4, p. 355-370Article in journal (Refereed)
    Abstract [en]

    A digital 3D-reconstruction of the Baltic Ice Lake's (BIL) configuration during the termination of the Younger Dryas cold phase (ca. 11700 cal. yr BP) was compiled using a combined bathymetric–topographic Digital Terrain Model (DTM), Scandinavian ice

    sheet limits, Baltic Sea Holocene bottom sediment thickness information, and a  paleoshoreline database maintained at the Lund University. The bathymetric–topographic DTM, assembled from publicly available data sets, has a resolution of 500×500 m on Lambert Azimuthal Equal Area projection allowing area and volume calculations of the BIL to be made with an unprecedented accuracy. When the damming Scandinavian ice sheet margin eventually retreated north of Mount Billingen, the high point in terrain of Southern central Sweden bordering to lower terrain further to the north, the BIL was catastrophically drained resulting in a 25 m drop of the lake level. With our digital reconstruction, we estimate that approximately 7800 km3 of water drained during this event and that the ice dammed lake area was reduced by ca. 18%. Building on previous results suggesting drainage over 1 to 2 years, our lake volume calculations imply that the freshwater flux to the contemporaneous sea in the west was between about 0.12 and 0.25 Sv. The BIL reconstruction provides new detailed information on the paleogeography in the area of southern Scandinavia, both before and after the drainage event, with implications for interpretations of geological records concerning the post-glacial environmental development.

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