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Submarine groundwater discharge at Forsmark, Gulf of Bothnia, providedby Ra isotopes
The Swedish Nuclear Fuel and Waste Management Company.
Universitat Autònoma de Barcelona.
Universitat Autònoma de Barcelona.
CEREGE, Aix-Marseille Université.
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2017 (English)In: Marine Chemistry, ISSN 0304-4203, E-ISSN 1872-7581, Vol. 196, 162-172 p.Article in journal (Refereed) Published
Abstract [en]

Submarine groundwater discharge (SGD) to the Gulf of Bothnia, Baltic Sea, has been believed to be insignificant from hydrological models, yet geochemical investigations of SGD in this basin are limited. In this study, 223Ra, 224Ra, 226Ra, and 228Ra have been complemented by stable δ18O and d2H isotopes to characterize and quantify SGD rates from the coast of Forsmark, Sweden to Öregrundsgrepen Strait (Gulf of Bothnia). In shallow bays, SGD has been traced using relations between Ra, d2H and d18O isotopes and salinity. Zonal SGD from deformation zones, expressed as hydraulically conductive fractures, overlain by the Börstilåsen esker, a strip of conductive gravel sediment, have been traced through offshore 224Raxs and 226Ra trends. On the basis of a 224Raxs mass balance, the SGD flow rate ranges from (5.5 ± 3.0) · 103 m3 d-1 to (950 ± 520) · 103 m3 d-1. These rates are up to two orders of magnitude higher than those determined from local hydrological models, which consider only the fresh component of SGD. From the divergence between the hydrological and 224Raxs models, it is inferred that the site is influenced by a component of recirculated seawater.

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2017. Vol. 196, 162-172 p.
Keyword [en]
Submarine groundwater, Ra isotopes, Forsmark, Baltic Sea
National Category
Geochemistry
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-2498DOI: 10.1016/j.marchem.2017.09.003OAI: oai:DiVA.org:nrm-2498DiVA: diva2:1154888
Funder
EU, FP7, Seventh Framework Programme, 748896
Available from: 2017-11-06 Created: 2017-11-06 Last updated: 2017-11-06Bibliographically approved

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