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Bathymetric properties of the Baltic Sea
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences.ORCID iD: 0000-0002-6046-1488
Stockholm University, Faculty of Science, Department of Geological Sciences.
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Number of Authors: 72019 (English)In: Ocean Science, ISSN 1812-0784, E-ISSN 1812-0792, Vol. 15, no 4, p. 905-924Article in journal (Refereed) Published
Abstract [en]

Baltic Sea bathymetric properties are analysed here using the newly released digital bathymetric model (DBM) by the European Marine Observation and Data Network (EMODnet). The analyses include hypsometry, volume, descriptive depth statistics, and kilometre-scale seafloor ruggedness, i.e. terrain heterogeneity, for the Baltic Sea as a whole as well as for 17 sub-basins defined by the Baltic Marine Environment Protection Commission (HELCOM). We compare the new EMODnet DBM with IOWTOPO the previously most widely used DBM of the Baltic Se aproduced by the Leibniz-Institut fur Ostseeforschung Warnemiinde (IOW), which has served as the primary gridded bathymetric resource in physical and environmental studies for nearly two decades. The area of deep water exchange between the Bothnian Sea and the Northern Baltic Proper across the Aland Sea is specifically analysed in terms of depths and locations of critical bathymetric sills. The EMODnet DBM provides a bathymetric sill depth of 88 m at the northern side of the Aland Sea and 60 m at the southern side, differing from previously identified sill depths of 100 and 70 m, respectively. High-resolution multibeam bathymetry acquired from this deep water exchange path, where vigorous bottom currents interacted with the seafloor, allows us to assess what presently available DBMs are missing in terms of physical characterization of the seafloor. Our study highlights the need for continued work towards complete high-resolution mapping of the Baltic Sea seafloor.

Place, publisher, year, edition, pages
2019. Vol. 15, no 4, p. 905-924
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-171728DOI: 10.5194/os-15-905-2019ISI: 000475622800001OAI: oai:DiVA.org:su-171728DiVA, id: diva2:1350040
Available from: 2019-09-10 Created: 2019-09-10 Last updated: 2019-12-09Bibliographically approved

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Jakobsson, MartinStranne, ChristianO'Regan, MattGreenwood, Sarah L.Gustafsson, BoHumborg, Christoph
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Department of Geological SciencesStockholm University Baltic Sea Centre
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Ocean Science
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