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Holocene relative sea level changes in the Vastervik-Gamlebyviken region on the southeast coast of Sweden, southern Baltic Sea
Umeå University, Sweden.ORCID iD: 0000-0003-4881-2481
Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Environmental Science.ORCID iD: 0000-0003-2016-4857
Södertörn University, School of Historical and Contemporary Studies, MARIS (Maritime Archaeological Research Institute). Västerviks Museum, Sweden.
Södertörn University, School of Historical and Contemporary Studies, Archaeology. Södertörn University, School of Historical and Contemporary Studies, MARIS (Maritime Archaeological Research Institute).ORCID iD: 0000-0002-5442-1981
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2023 (English)In: Boreas, ISSN 0300-9483, E-ISSN 1502-3885, Vol. 52, no 2, p. 206-222Article in journal (Refereed) Published
Abstract [en]

We reconstruct the Holocene shore displacement of the Vastervik-Gamlebyviken area on the southeast coast of Sweden, characterised by a maritime cultural landscape and archaeological significance since the Mesolithic. Sediment cores were retrieved from four lake basins that have been raised above sea level due to the postglacial land uplift and eustatic sea level changes after the melting of the Fennoscandian Ice Sheet. The cores were radiocarbon dated and analysed for loss on ignition and diatoms. The isolation thresholds of the basins were determined using LiDAR data. The results provide evidence for the initiation of the first Littorina Sea transgression in this area at 8.5 thousand calibrated years before present (cal. ka BP). A relative sea level rise by similar to 7 m a.s.l. is recorded between 8.0 and 7.5 cal. ka BP with a highstand at similar to 22 m a.s.l. between 7.5 and 6.2 cal. ka BP. These phases coincide with the second and third Littorina Sea transgressions, respectively, in the Blekinge area, southern Sweden and are consistent with the final deglaciation of North America. After 6.2 cal. ka BP, the relative sea level dropped below 22 m a.s.l., and remained at similar to 20 m a.s.l. until 4.6 cal. ka BP coinciding with the fourth Littorina Sea transgression in Blekinge. From 4.6 to 4.2 cal. ka BP, the shore displacement shows a regression rate of 10 mm a(-1) followed by a slowdown with a mean value of 4.6 mm a(-1) until 1.6 cal. ka BP, when the relative sea level dropped below 3.3 m a.s.l. The Middle to Late Holocene highstand and other periods of minor sea level transgressions and/or higher salinity between 6.2 and 1.7 cal. ka BP are attributed to a combination of warmer climate and higher inflow of saline waters in the southern Baltic Sea due to stronger westerlies, caused by variations in the North Atlantic atmospheric patterns.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023. Vol. 52, no 2, p. 206-222
National Category
Archaeology Earth and Related Environmental Sciences
Research subject
Baltic and East European studies
Identifiers
URN: urn:nbn:se:sh:diva-50107DOI: 10.1111/bor.12605ISI: 000864284500001Scopus ID: 2-s2.0-85139201509OAI: oai:DiVA.org:sh-50107DiVA, id: diva2:1705197
Part of project
Seaside - A multidisciplinary study of maritime environmental history, The Foundation for Baltic and East European StudiesUnravelling the relative influence of climate and land-use change on nitrogen retention in Baltic Sea coastal sediments over the last 300 years, The Foundation for Baltic and East European Studies
Funder
The Foundation for Baltic and East European Studies, 55/2017The Foundation for Baltic and East European Studies, 21-PD2-0002Available from: 2022-10-21 Created: 2022-10-21 Last updated: 2023-04-13Bibliographically approved

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Dahl, MartinPalm, VeronicaRönnby, JohanAndrén, ThomasAndrén, Elinor

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