Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.chemgeo.2021.120340
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dc.titleEstuarine processes modify the isotope composition of dissolved riverine barium fluxes to the ocean
dc.contributor.authorBridgestock, Luke
dc.contributor.authorNathan, Joseph
dc.contributor.authorPaver, Robert
dc.contributor.authorHsieh, Yu-Te
dc.contributor.authorPorcelli, Don
dc.contributor.authorTanzil, Jani
dc.contributor.authorHoldship, Phil
dc.contributor.authorCarrasco, Gonzalo
dc.contributor.authorAnnammala, Kogila Vani
dc.contributor.authorSwarzenski, Peter W
dc.contributor.authorHenderson, Gideon M
dc.date.accessioned2021-07-22T01:49:08Z
dc.date.available2021-07-22T01:49:08Z
dc.date.issued2021-09-30
dc.identifier.citationBridgestock, Luke, Nathan, Joseph, Paver, Robert, Hsieh, Yu-Te, Porcelli, Don, Tanzil, Jani, Holdship, Phil, Carrasco, Gonzalo, Annammala, Kogila Vani, Swarzenski, Peter W, Henderson, Gideon M (2021-09-30). Estuarine processes modify the isotope composition of dissolved riverine barium fluxes to the ocean. Chemical Geology 579 : 120340-120340. ScholarBank@NUS Repository. https://doi.org/10.1016/j.chemgeo.2021.120340
dc.identifier.issn00092541
dc.identifier.urihttps://scholarbank.nus.edu.sg/handle/10635/194737
dc.description.abstractBarium (Ba) isotope variations offer the potential to trace environmental processes, including long-term changes in river discharge and marine export production. Riverine inputs are an important source of dissolved Ba to the ocean, which we estimate to be ~10 to 20 Gmol yr−1. A large fraction (~20 to 75%) of this net riverine dissolved Ba flux to the ocean is derived from estuarine processes, in particular the release of exchangeable Ba from riverine suspended particles due to exchange with major cations in seawater. Despite the importance of this process for controlling the input of dissolved Ba to the ocean, its impact on the δ138/134Ba of net riverine dissolved Ba fluxes remains unknown. To address this observational gap, Ba concentration and isotope data from across the estuarine mixing zones of the Amazon (Brazil), Fly (Papua New Guinea) and Johor (Malaysia) Rivers are presented. Desorption from suspended riverine particles releases Ba with δ138/134Ba 0.2 to 0.3‰ lower than corresponding river dissolved loads, modifying the isotope composition of net riverine dissolved Ba fluxes that reach the ocean. This offset likely represents an isotope fractionation accompanying the adsorption of Ba by particulate phases within river catchments, which can explain the systematic enrichment of heavier Ba isotopes in river dissolved loads relative to weathering lithologies. River dissolved loads are also systematically offset to higher δ138/134Ba than the main oceanic Ba sink: burial of BaSO4 in marine sediment. This represents an apparent imbalance in the modern marine Ba isotope budget. Our results suggest that accounting for modification of the δ138/134Ba of net riverine Ba fluxes to the ocean by estuarine processes is likely to play a key role towards balancing the modern marine Ba isotope budget.
dc.publisherElsevier BV
dc.sourceElements
dc.subjectBa isotopes
dc.subjectestuaries
dc.subjectriverine Ba fluxes
dc.subjectmarine Ba cycle
dc.typeArticle
dc.date.updated2021-07-21T06:32:02Z
dc.contributor.departmentTROPICAL MARINE SCIENCE INSTITUTE
dc.description.doi10.1016/j.chemgeo.2021.120340
dc.description.sourcetitleChemical Geology
dc.description.volume579
dc.description.page120340-120340
dc.published.statePublished
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