Separating isotopic impacts of karst and in-cave processes from climate variability using an integrated speleothem isotope-enabled forward model

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dc.contributor.authorTreble, PCen_AU
dc.contributor.authorMah, Men_AU
dc.contributor.authorGriffiths, ADen_AU
dc.contributor.authorBaker, AAen_AU
dc.contributor.authorDeininger, Men_AU
dc.contributor.authorKelly, BFJen_AU
dc.contributor.authorScholtz, Den_AU
dc.contributor.authorHankin, SIen_AU
dc.date.accessioned2022-08-19T05:45:40Zen_AU
dc.date.available2022-08-19T05:45:40Zen_AU
dc.date.issued2019-03-12en_AU
dc.date.statistics2022-07-27en_AU
dc.descriptionThis is a Preprint and has not been peer reviewed. This is version 2 of this Preprint. CC BY Attribution 4.0 International License.en_AU
dc.description.abstractSpeleothem δ18O values are commonly used to infer past climate variability. However, both non-linear karst hydrological processes and in-cave disequilibrium isotope fractionation are recognised and hinder the interpretation of δ18O values. In recent years, proxy system models (PSMs) have emerged to quantitatively assess the confounding effects of these processes. This study presents the first integrated stalagmite δ18O PSM (Karstolution) by coupling an existing karst hydrology with an in cave fractionation PSM. The new modelling framework not only couples the two models, but also includes diffuse flow modelling, coupling of drip rate with infiltration, linking of surface with cave temperature, and incorporates cave seasonality effects. We test Karstolution using a cave monitoring dataset from Golgotha Cave, SW Australia. The predictive capacity of the model is assessed by comparing the output to stalagmite δ18O values. By comparing with observed stalagmite δ18O values, this study is also the first to quantify in-cave disequilibrium both kinetic isotopic fractionation in a speleothem and informs the conclusion that hydroclimatic processes contributes more to the variability of stalagmite δ18O values at Golgotha Cave than does in-cave processes. This is further supported via a sensitivity analysis performed by simulating the impacts of a wider range of cave temperature, ventilation, drip interval and pCO2 values than measured. © The Authors 2019en_AU
dc.description.sponsorshipThis study contributes to ARC Discovery Project 361DP140102059 awarded to PCT and to ARC Linkage Project LP130100177 awarded to AB and PCT. 362 MM was supported by DAAD funding. MD and DS acknowledges funding of the DFG through grants 363DE 2398/3-1 and SCHO 1274/9-1, respectively.en_AU
dc.identifier.citationTreble, P. C., Mah, M., Griffiths, A., Baker, A. A., Deininger, M., Kelly, B., Scholz, D. & Hankin, S. (2019). Separating isotopic impacts of karst and in-cave processes from climate variability using an integrated speleothem isotope-enabled forward model. EarthArxiv, Preprint (Version 2). doi:10.31223/osf.io/j4kn6en_AU
dc.identifier.journaltitleEarthArxiven_AU
dc.identifier.urihttps://doi.org/10.31223/osf.io/j4kn6en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13585en_AU
dc.identifier.volumePrepriinten_AU
dc.language.isoenen_AU
dc.publisherEarthArXiven_AU
dc.subjectBiogeochemistryen_AU
dc.subjectHydrologyen_AU
dc.subjectOxygen isotopesen_AU
dc.subjectCavesen_AU
dc.subjectClimatesen_AU
dc.subjectSimulationen_AU
dc.subjectAustraliaen_AU
dc.titleSeparating isotopic impacts of karst and in-cave processes from climate variability using an integrated speleothem isotope-enabled forward modelen_AU
dc.typeJournal Articleen_AU
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