A general reactive transport modeling framework for simulating and interpreting groundwater 14C age and δ13C

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dc.contributor.authorSalmon, SUen_AU
dc.contributor.authorPrommer, Hen_AU
dc.contributor.authorPark, Jen_AU
dc.contributor.authorMeredith, KTen_AU
dc.contributor.authorTurner, JVen_AU
dc.contributor.authorMcCallum, JLen_AU
dc.date.accessioned2022-07-22T03:59:07Zen_AU
dc.date.available2022-07-22T03:59:07Zen_AU
dc.date.issued2014-12-12en_AU
dc.date.statistics2022-06-29en_AU
dc.description.abstractA reactive transport modeling framework is presented that allows simultaneous assessment of groundwater flow, water quality evolution including δ13C, and 14C activity or “age”. Through application of this framework, simulated 14C activities can be directly compared with measured 14C activities. This bypasses the need for interpretation of a 14C age prior to flow simulation through factoring out processes other than radioactive decay, which typically involves simplifying assumptions regarding spatial and temporal variability in reactions, flow, and mixing. The utility of the approach is demonstrated for an aquifer system with spatially variable carbonate mineral distribution, multiple organic carbon sources, and transient boundary conditions for 14C activity in the recharge water. In this case, the simulated 14C age was shown to be relatively insensitive to isotopic fractionation during DOC oxidation and variations in assumed DOC degradation behavior. We demonstrate that the model allows quantitative testing of hypotheses regarding controls on groundwater age and water quality evolution for all three carbon isotopes. The approach also facilitates incorporation of multiple environmental tracers and combination with parameter optimization techniques. ©2014 American Geophysical Unionen_AU
dc.description.sponsorshipNational Centre for Groundwater Research and Training (NCGRT) Australian Research Council - Grant Number: ARC Project ID SR0800001en_AU
dc.identifier.citationSalmon, S. U., Prommer, H., Park, J., Meredith, K. T., Turner, J. V., & McCallum, J. L. (2015). A general reactive transport modeling framework for simulating and interpreting groundwater 14C age and δ13C. Water Resources Research, 51(1), 359-376. doi:10.1002/2014WR015779en_AU
dc.identifier.issn1944-7973en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleWater Resources Researchen_AU
dc.identifier.pagination359-376en_AU
dc.identifier.urihttps://doi.org/10.1002/2014WR015779en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13422en_AU
dc.identifier.volume51en_AU
dc.language.isoenen_AU
dc.publisherJohn Wiley & Sons, Incen_AU
dc.subjectEnvironmental transporten_AU
dc.subjectGround wateren_AU
dc.subjectCarbonen_AU
dc.subjectCarbon 14en_AU
dc.subjectTracer techniquesen_AU
dc.subjectWater qualityen_AU
dc.titleA general reactive transport modeling framework for simulating and interpreting groundwater 14C age and δ13Cen_AU
dc.typeJournal Articleen_AU
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