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Integrated use of LiDAR and multibeam bathymetry reveals onset of ice streaming in the northern Bothnian Sea
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Physical Geography.
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Number of Authors: 6
2015 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 137, no 4, 284-292 p.Article in journal (Refereed) Published
Abstract [en]

Geomorphological mapping from the new LiDAR (Light Detection and Ranging)-derived digital elevation model for Sweden and a high-resolution multibeam bathymetry data-set for the Gulf of Bothnia reveals a continuous system of glacial landforms crossing the transition between the modern terrestrial and marine environments. A palaeo-ice stream in the northern Bothnian Sea is reconstructed, with an onset tributary over the present-day angstrom ngermanland-Vasterbotten coastline. Systematic contrasts in landform morphology and lineation length indicate that this ice stream comprised a relatively narrow (approximate to 40km) corridor of fast flow, flowing first SW then S, and likely fed by converging flow around the upper Bothnian Sea. The geometry and landform associations of this system imply that ice, at the time period represented here, did not flow across the Gulf of Bothnia: SSE-ward ice flow indicators on the northern Swedish coast do not correspond directly with landform assemblages of the large SE-oriented Finnish deglacial lobes. Instead, we suggest they may contribute to a late-stage fast-flow event to the S and SW. Multibeam bathymetry data offer entirely new access into the rich, landform-scale geomorphological record on the seafloor of the Gulf of Bothnia. The combination of offshore multibeam with the new terrestrial LiDAR data provides unprecedented insight into and renewed understanding of the glacial dynamics of the Bothnian Sea sector of the Fennoscandian Ice Sheet, hitherto interpreted over large areas of unmapped ice sheet bed.

Place, publisher, year, edition, pages
2015. Vol. 137, no 4, 284-292 p.
Keyword [en]
glacial geomorphology, Fennoscandian Ice Sheet, ice stream, lineations, Gulf of Bothnia
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-125873DOI: 10.1080/11035897.2015.1055513ISI: 000367018000003OAI: oai:DiVA.org:su-125873DiVA: diva2:897668
Available from: 2016-01-26 Created: 2016-01-19 Last updated: 2016-01-26Bibliographically approved

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Greenwood, Sarah L.Clason, Caroline C.
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