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.accessioned2023-12-21T00:27:15Zen_AU
dc.date.available2023-12-21T00:27:15Zen_AU
dc.date.issued2022-04-20en_AU
dc.date.statistics2022-07-21en_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. © The Authors, Open Access under CC 4.0en_AU
dc.description.sponsorshipA portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by the National Science Foundation Division of Materials Research and Division of Chemistry through DMR-1644779, and the State of Florida. This 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). Groundwater sampling was possible at Wellington and Maules Creek through the NCRIS Groundwater Infrastructure Project. 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. The National High Magnetic Field Laboratory ICR User Facility is supported by the National Science Foundation Division of Chemistry and Division of Materials Research through DMR-1644779, DMR-1157490 and the State of Florida.en_AU
dc.identifier.articlenumber2153en_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), 2153. doi:10.1038/s41467-022-29711-9en_AU
dc.identifier.issn2041-1723en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleNature Communicationsen_AU
dc.identifier.urihttps://doi.org/10.1038/s41467-022-29711-9en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15293en_AU
dc.identifier.volume12en_AU
dc.language.isoenen_AU
dc.publisherSpringer Nature Limiteden_AU
dc.relation.urihttps://doi.org/10.1038/s41467-022-29711-9en_AU
dc.subjectGround wateren_AU
dc.subjectFresh wateren_AU
dc.subjectEarth planeten_AU
dc.subjectCarbon cycleen_AU
dc.subjectCarbon sinksen_AU
dc.subjectMass spectroscopyen_AU
dc.subjectSeasen_AU
dc.titleA new conceptual framework for the transformation of groundwater dissolved organic matteren_AU
dc.typeJournal Articleen_AU
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