A new conceptual framework for the transformation of groundwater dissolved organic matter

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dc.contributor.authorMcDonough, LKen_AU
dc.contributor.authorAndersen, MSen_AU
dc.contributor.authorBehnke, MIen_AU
dc.contributor.authorRutlidge, Hen_AU
dc.contributor.authorOudone, PPen_AU
dc.contributor.authorMeredith, KTen_AU
dc.contributor.authorO'Carroll, DMen_AU
dc.contributor.authorSantos, IRen_AU
dc.contributor.authorMarjo, CEen_AU
dc.contributor.authorSpencer, RGMen_AU
dc.contributor.authorMcKenna, AMen_AU
dc.contributor.authorBaker, AAen_AU
dc.date.accessioned2023-01-13T02:18:54Zen_AU
dc.date.available2023-01-13T02:18:54Zen_AU
dc.date.issued2022-04-20en_AU
dc.date.statistics2022-11-10en_AU
dc.descriptionThis article is licensed under a Creative Commons Attribution 4.0 International License.en_AU
dc.description.abstractGroundwater comprises 95% of the liquid fresh water on Earth and contains a diverse mix of dissolved organic matter (DOM) molecules which play a significant role in the global carbon cycle. Currently, the storage times and degradation pathways of groundwater DOM are unclear, preventing an accurate estimate of groundwater carbon sources and sinks for global carbon budgets. Here we reveal the transformations of DOM in aging groundwater using ultra-high resolution mass spectrometry combined with radiocarbon dating. Long-term anoxia and a lack of photodegradation leads to the removal of oxidised DOM and a build-up of both reduced photodegradable formulae and aerobically biolabile formulae with a strong microbial signal. This contrasts with the degradation pathway of DOM in oxic marine, river, and lake systems. Our findings suggest that processes such as groundwater extraction and subterranean groundwater discharge to oceans could result in up to 13 Tg of highly photolabile and aerobically biolabile groundwater dissolved organic carbon released to surface environments per year, where it can be rapidly degraded. These findings highlight the importance of considering groundwater DOM in global carbon budgets. Crown Copyright © 2022en_AU
dc.description.sponsorshipThis research was funded by the Australian Research Council under Discovery Project DP160101379 (awarded to A.B., M.A., D.O. and K.M.). The authors acknowledge the financial support of the Centre for Accelerator Science at ANSTO through the Australian National Collaborative Research Infrastructure Strategy (NCRIS). The National High Magnetic Field Laboratory ICR User Facility is supported by the National Science Foundation Division of Chemistry through DMR-1644779, DMR-1157490 and the State of Florida.en_AU
dc.identifier.citationMcDonough, L. K., Andersen, M. S., Behnke, M. I., Rutlidge, H., Oudone, P., Meredith, K., O'Carroll, D. M., Santos, I. R., Marjo, C. E., Spencer, R. G. M., McKenna, A. M. & Baker, A. (2022). A new conceptual framework for the transformation of groundwater dissolved organic matter. Nature communications, 13(1), 1-11. doi:10.1038/s41467-022-29711-9en_AU
dc.identifier.issn2041-1723en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleNature communicationsen_AU
dc.identifier.pagination1-11en_AU
dc.identifier.urihttps://doi.org/10.1038/s41467-022-29711-9en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14343en_AU
dc.identifier.volume13en_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.subjectCarbon cycleen_AU
dc.subjectHydrologyen_AU
dc.subjectGround wateren_AU
dc.subjectLakesen_AU
dc.subjectCarbonen_AU
dc.subjectOrganic matteren_AU
dc.subjectMass spectroscopyen_AU
dc.titleA new conceptual framework for the transformation of groundwater dissolved organic matteren_AU
dc.typeJournal Articleen_AU
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