Groundwater discharge impacts marine isotope budgets of Li, Mg, Ca, Sr, and Ba

@article{Mayfield2021,
  Title = {Groundwater discharge impacts marine isotope budgets of Li, Mg, Ca, Sr, and Ba},
  Author = {Mayfield, Kimberly K. and Eisenhauer, Anton and Santiago Ramos, Danielle P. and Higgins, John A. and Horner, Tristan J. and Auro, Maureen and Magna, Thomas and Moosdorf, Nils and Charette, Matthew A. and Gonneea, Meagan E. and Brady, Carolyn E. and Komar, Nemanja and Peucker-Ehrenbrink, Bernhard and Paytan, Adina},
  Editor = {},
  Journal = {Nature Communications},
  Year = {2021},
  Volume = {12},
  Doi = {10.1038/s41467-020-20248-3},
  Abstract = {Groundwater-derived solute fluxes to the ocean have long been assumed static and subordinate to riverine fluxes, if not neglected entirely, in marine isotope budgets. Here we present concentration and isotope data for Li, Mg, Ca, Sr, and Ba in coastal groundwaters to constrain the importance of groundwater discharge in mediating the magnitude and isotopic composition of terrestrially derived solute fluxes to the ocean. Data were extrapolated globally using three independent volumetric estimates of groundwater discharge to coastal waters, from which we estimate that groundwater-derived solute fluxes represent, at a minimum, 5% of riverine fluxes for Li, Mg, Ca, Sr, and Ba. The isotopic compositions of the groundwater-derived Mg, Ca, and Sr fluxes are distinct from global riverine averages, while Li and Ba fluxes are isotopically indistinguishable from rivers. These differences reflect a strong dependence on coastal lithology that should be considered a priority for parameterization in Earth-system models.},
}

TY  - JOUR
AU  - Mayfield, Kimberly K.
AU  - Eisenhauer, Anton
AU  - Santiago Ramos, Danielle P.
AU  - Higgins, John A.
AU  - Horner, Tristan J.
AU  - Auro, Maureen
AU  - Magna, Thomas
AU  - Moosdorf, Nils
AU  - Charette, Matthew A.
AU  - Gonneea, Meagan E.
AU  - Brady, Carolyn E.
AU  - Komar, Nemanja
AU  - Peucker-Ehrenbrink, Bernhard
AU  - Paytan, Adina
TI  - Groundwater discharge impacts marine isotope budgets of Li, Mg, Ca, Sr, and Ba
T2  - Nature Communications
PY  - 2021
VL  - 12
DO  - 10.1038/s41467-020-20248-3
AB  - Groundwater-derived solute fluxes to the ocean have long been assumed static and subordinate to riverine fluxes, if not neglected entirely, in marine isotope budgets. Here we present concentration and isotope data for Li, Mg, Ca, Sr, and Ba in coastal groundwaters to constrain the importance of groundwater discharge in mediating the magnitude and isotopic composition of terrestrially derived solute fluxes to the ocean. Data were extrapolated globally using three independent volumetric estimates of groundwater discharge to coastal waters, from which we estimate that groundwater-derived solute fluxes represent, at a minimum, 5% of riverine fluxes for Li, Mg, Ca, Sr, and Ba. The isotopic compositions of the groundwater-derived Mg, Ca, and Sr fluxes are distinct from global riverine averages, while Li and Ba fluxes are isotopically indistinguishable from rivers. These differences reflect a strong dependence on coastal lithology that should be considered a priority for parameterization in Earth-system models.
ER  -