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Submarine groundwater discharge at Forsmark, Gulf of Bothnia, provided by Ra isotopes
Stockholm University, Faculty of Science, Department of Geological Sciences. The Swedish Nuclear Fuel and Waste Management Company, Sweden; Swedish Museum of Natural History, Sweden.
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Number of Authors: 62017 (English)In: Marine Chemistry, ISSN 0304-4203, E-ISSN 1872-7581, Vol. 196, p. 162-172Article 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, Ra-223, Ra-224, Ra-226, and Ra-228 a have been complemented by stable delta O-18 and delta H-2 isotopes to characterize and quantify SGD rates from the coast of Forsmark, Sweden to Oregrundsgrepen Strait (Gulf of Bothnia). In shallow bays, SGD has been traced using relations between Ra, delta H-2 and delta O-18 isotopes and salinity. Zonal SGD from deformation zones, expressed as hydraulically conductive fractures, overlain by the Borstilasen esker, a strip of conductive gravel sediment, have been traced through offshore Ra-224(xs) and Ra-226 trends. On the basis of a Ra-224(xs) mass balance, the SGD flow rate ranges from (5.5 +/- 3.0).10(3) m(3) d(-1) to (950 +/- 520).10(3) m(3) 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 Ra-224(xs) models, it is inferred that the site is influenced by a component of recirculated seawater.

Place, publisher, year, edition, pages
2017. Vol. 196, p. 162-172
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Chemical Sciences Earth and Related Environmental Sciences
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URN: urn:nbn:se:su:diva-149790DOI: 10.1016/j.marchem.2017.09.003ISI: 000415773500015OAI: oai:DiVA.org:su-149790DiVA, id: diva2:1167860
Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2017-12-19Bibliographically approved

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