Estuarine processes modify the isotope composition of dissolved riverine barium fluxes to the ocean
Journal
Chemical Geology
Journal Volume
579
Date Issued
2021
Author(s)
Abstract
Barium (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. ? 2021 Elsevier B.V.
Subjects
Ba isotopes
Estuaries
Marine Ba cycle
Riverine Ba fluxes
Budget control
Catchments
Dissolution
Oceanography
Rivers
Sediments
Submarine geology
Sulfur compounds
Barium fluxes
Barium isotope
Dissolved load
Environmental process
Estuarine process
Isotope compositions
Isotope variation
Long-term changes
Marine barium cycle
Riverine barium flux
Isotopes
barium
concentration (composition)
dissolved matter
estuarine chemistry
isotopic composition
river discharge
Amazonas [Brazil]
Brazil
Fly Estuary
Johor
Johor River
Malaysia
New Guinea
Papua New Guinea
West Malaysia
Western Province [Papua New Guinea]
SDGs
Type
journal article