Evolution of chemical and isotopic composition of inorganic carbon in the unsaturated and saturated zones of a semi-arid zone environment

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dc.contributor.authorMeredith, KTen_AU
dc.contributor.authorHan, LFen_AU
dc.contributor.authorHollins, SEen_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorJacobsen, GEen_AU
dc.contributor.authorBaker, AAen_AU
dc.date.accessioned2021-12-24T00:11:29Zen_AU
dc.date.available2021-12-24T00:11:29Zen_AU
dc.date.issued2017-07-12en_AU
dc.date.statistics2021-11-02en_AU
dc.description.abstractEstimating groundwater age is important for any groundwater resource assessment and radiocarbon (14C) dating can provide this information. However a thorough investigation of the water in the soil-plant-atmosphere continuum leading to the evolution of dissolved inorganic carbon (DIC) in groundwater is required for interpretation in a water-limited environment. In this study we trace the evolution of DIC through the unsaturated and saturated zones after prolonged drought and post-flooding of a major river system, the Darling River. In doing so, we quantified the contribution of carbon from various processes influencing the 14C content of DIC in groundwater. None of the simple 14C adjustment models could be applied for age estimation. Therefore, we used a combination of a graphical method and mass-balance calculations. It was found that the saline groundwaters evolved via carbon exchange between DIC- carbon dioxide gas (CO2(g)) in the unsaturated zone and DIC-carbonate minerals in the saturated zone with water-sediment reactions driving ion exchange on clay minerals facilitating carbonate dissolution. This study shows the problems associated with using radiocarbon dating in a semi-arid zone or water-limited environment and the required carbon measurements needed to reduce this uncertainty.en_AU
dc.identifier.citationMeredith, K. T., Han, L. F., Hollins, S. E., Cendón, D. I., Jacobsen, G. E., & Baker, A. (2017). Evolution of chemical and isotopic composition of inorganic carbon in the unsaturated and saturated zones of a semi-arid zone environment. Paper presented to the 2017 Biennial Australasian Groundwater Conference, UNSW Sydney, 11 - 13 July 2017. Retrieved from: http://agc-2017.p.agc2017.currinda.com/days/2017-07-12/abstract/264en_AU
dc.identifier.conferenceenddate13 July 2017en_AU
dc.identifier.conferencename2017 Biennial Australasian Groundwater Conferenceen_AU
dc.identifier.conferenceplaceSydney, Australiaen_AU
dc.identifier.conferencestartdate11 July 2017en_AU
dc.identifier.urihttp://agc-2017.p.agc2017.currinda.com/days/2017-07-12/abstract/264en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12661en_AU
dc.language.isoenen_AU
dc.publisherNational Centre for Groundwater Research And Trainingen_AU
dc.subjectCarbonen_AU
dc.subjectArid landsen_AU
dc.subjectEnvironmenten_AU
dc.subjectCarbon 14en_AU
dc.subjectWateren_AU
dc.subjectGround wateren_AU
dc.subjectClaysen_AU
dc.subjectMineralsen_AU
dc.titleEvolution of chemical and isotopic composition of inorganic carbon in the unsaturated and saturated zones of a semi-arid zone environmenten_AU
dc.typeConference Presentationen_AU
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