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Late Holocene freshening of the Baltic Sea derived from high-resolution strontium isotope analyses of mollusk shells
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Laboratory for Isotope Geology. Swedish Museum of Natural History, Stockholm.
2011 (English)In: Geology, ISSN 0091-7613, E-ISSN 1943-2682, Vol. 39, no 2, p. 187-190Article in journal (Refereed) Published
Abstract [en]

Strontium isotopic composition (87Sr/86Sr) data from subfossil 14C-dated mollusk shells in raised beach sediments are used as a paleosalinity proxy in the brackish Baltic Sea, the precision (±5%) and accuracy (±0.7‰) of the method being judged from replicate analyses of modern shells. Paleosalinity data with an average time resolution of ~200 yr for the period 7130-2775 calibrated 14C yr B.P. indicate maximum surface salinities of 10‰-11‰, 11‰-12‰, and 12‰-13‰ for the Bothnian Bay, Bothnian Sea, and Baltic Proper (the three major Baltic subbasins). The relative salinity differences between the basins were small (≤30%) compared to the as much as eightfold present-day relative salinity differences (Bothnian Bay 1‰-3‰; Bothnian Sea 4‰-5‰; Baltic Proper 6‰-8‰). Late Holocene freshening (ca. 3000 calibrated 14C yr B.P. to present) is most pronounced in the northernmost subbasin, the Bothnian Bay, consistent with the absence of a permanent halocline, sequestering of phosphorus in well-oxygenated bottom sediments, and phosphorus limitation of primary production in the present-day Bothnian Bay. This study suggests that paleosalinity data may be crucial to improving our understanding of the possible effects of any future, climate-induced freshening of the Baltic Sea

Place, publisher, year, edition, pages
2011. Vol. 39, no 2, p. 187-190
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-4996DOI: 10.1130/G31524.1ISI: 000286505300023Scopus ID: 2-s2.0-78851469167Local ID: 302518c5-5853-4ead-b3b5-ab0866e6516cOAI: oai:DiVA.org:ltu-4996DiVA, id: diva2:977870
Note
Validerad; 2011; 20110203 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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