Tracing organic carbon processes in a shallow coastal sandy aquifer

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dc.contributor.authorMeredith, KTen_AU
dc.contributor.authorAndersen, MSen_AU
dc.contributor.authorBaker, AAen_AU
dc.contributor.authorO'Carroll, DMen_AU
dc.contributor.authorBryan, Een_AU
dc.contributor.authorZainuddin, NSen_AU
dc.contributor.authorRutlidge, Hen_AU
dc.contributor.authorMcDonough, LKen_AU
dc.date.accessioned2022-12-02T05:07:19Zen_AU
dc.date.available2022-12-02T05:07:19Zen_AU
dc.date.issued2017-12-14en_AU
dc.date.statistics2022-11-28en_AU
dc.description.abstractCoastal groundwater resources are likely to be impacted by climate change due to changes in recharge patterns, surface water flow and sea-level rise, which all have the potential to change how carbon is transported and stored within a catchment. Large quantities of carbon are currently stored within coastal wetland systems, so understanding carbon dynamics is important for climate change predictions into the future. Furthermore, dissolved organic carbon (DOC) can play a major role in weathering processes and deterioration of water quality, therefore understanding the sources, degradation pathways and its reactivity is important. Groundwater samples were collected from five nested sites (15 wells) from a shallow (0-20m) coastal sandy aquifer system located at Anna Bay, New South Wales, Australia. Surface water samples were also collected from the adjacent wetland. Waters were measured for major ion chemistry, carbon isotopes (δ13CDIC, δ13CDOC and 14CDIC) and tritium (3H). The dissolved organic matter (DOM) character was determined using optical spectroscopy and liquid chromatography. DOC was found to be elevated in the wetland (18 ppm) and had the lowest δ13CDOC value (-30.3 ‰). The shallow (3.5 m) groundwater located closest to but downgradient of the wetland (5 m) had similar characteristics to the wetland sample but contained significantly lower DOC concentrations (5 ppm) and were 1 ‰ more enriched in δ13CDOC values. This suggests that the aquifer is a sink for organic matter and the process fractionates the carbon isotopes. Higher resolution studies are underway to characterise and constrain timescales for the DOC transformation processes.en_AU
dc.identifier.articlenumberB42B-03en_AU
dc.identifier.booktitleAGU Fall Meeting Abstractsen_AU
dc.identifier.citationMeredith, K., Andersen, M. S., Baker, A., O'Carroll, D. M., Bryan, E., Zainuddin, N. S., Rutlidge, H., & McDonough, L. (2017). Tracing organic carbon processes in a shallow coastal sandy aquifer. Poster presented at the AGU Fall Meeting, 2017, New Orleans, Louisiana, USA, 11-15 December 2017. In AGU Fall Meeting Abstracts, Vol. 2017, B42B-03. Retrieved from: https://agu.confex.com/agu/fm17/meetingapp.cgi/Paper/246905en_AU
dc.identifier.conferenceenddate15 December 2017en_AU
dc.identifier.conferencenameAGU Fall Meeting, 2017en_AU
dc.identifier.conferenceplaceNew Orleans, Louisiana, USAen_AU
dc.identifier.conferencestartdate11 December 2017en_AU
dc.identifier.urihttps://agu.confex.com/agu/fm17/meetingapp.cgi/Paper/246905en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14136en_AU
dc.identifier.volume2017en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Union (AGU)en_AU
dc.subjectTracer techniquesen_AU
dc.subjectGround wateren_AU
dc.subjectCarbonen_AU
dc.subjectAquifersen_AU
dc.subjectCoastal regionsen_AU
dc.subjectClimatic changeen_AU
dc.titleTracing organic carbon processes in a shallow coastal sandy aquiferen_AU
dc.typeConference Posteren_AU
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