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Assessing the utility of barium isotopes to trace Eurasian riverine freshwater inputs to the Arctic Ocean
University of Oxford.
University of Oxford.
University of Oxford.
University of Oxford.
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2021 (English)In: Marine Chemistry, ISSN 0304-4203, E-ISSN 1872-7581, Vol. 236, p. 104029-104029, article id 104029Article in journal (Refereed) Published
Abstract [en]

Tracing riverine freshwater transport pathways within the Arctic Ocean is key to understanding changes in Arctic Ocean freshwater inventories. Dissolved Ba concentrations have been used in this capacity but are compromised by non-conservative processes. To assess the potential for Ba isotopes to provide insights into the impact of such processes on Arctic Ocean dissolved Ba inventories, Ba concentration and isotope data for surface seawater samples from the Siberian Shelf and Bering Sea/Strait are presented. These samples capture the mixing of riverine freshwater discharged by the rivers Yenisey, Lena and Ob, with Atlantic and Pacific derived seawater, which are traced by relationships between salinity, Ba concentration and δ138/134Ba. The δ138/134Ba of net river inputs, following modification by estuarine processes, are constrained to be 0.31 ± 0.04‰, 0.20 ± 0.06‰ and 0.23 ± 0.04‰, for the rivers Yenisey, Lena and Ob respectively. These values are used to estimate an average δ138/134Ba for Eurasian river freshwater input to the Arctic Ocean of 0.23 ± 0.04‰. The Ba concentration and δ138/134Ba of Lena River freshwater transported across the Laptev Sea are modified by non-conservative processes. These non-conservative processes do not result in distinctive modification of dissolved Ba concentration-δ138/134Ba mixing relationships between Eurasian riverine freshwater and Arctic seawater, which unfortunately limits the potential of Ba isotopes to improve tracing riverine freshwater sources in the central Arctic Ocean basins using dissolved Ba inventories. More generally the results of this study help advance understanding of Ba isotope cycling in the environment and their development as an emerging tracer of marine processes.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 236, p. 104029-104029, article id 104029
Keywords [en]
Water Science and Technology, Environmental Chemistry, General Chemistry, Oceanography
National Category
Natural Sciences Oceanography, Hydrology and Water Resources
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-4361DOI: 10.1016/j.marchem.2021.104029OAI: oai:DiVA.org:nrm-4361DiVA, id: diva2:1615722
Funder
Swedish Research Council, 621-2004-4283Knut and Alice Wallenberg FoundationAvailable from: 2021-11-30 Created: 2021-11-30 Last updated: 2024-01-08Bibliographically approved

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