Evaluating model outputs using integrated global speleothem records of climate change since the last glacial

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dc.contributor.authorWurtzel, Jennifer
dc.contributor.authorComas-Bru, Laia
dc.contributor.authorHarrison, S.P.
dc.contributor.authorWerner, Martin
dc.contributor.authorRehfeld, Kira
dc.contributor.authorScroxton, Nick
dc.contributor.authorVeiga-Pires, Cristina
dc.date.accessioned2020-12-18T04:16:38Z
dc.date.available2020-12-18T04:16:38Z
dc.date.issued2019
dc.date.updated2020-09-06T08:19:09Z
dc.description.abstractAlthough quantitative isotope data from speleothems has been used to evaluate isotope-enabled model simulations, currently no consensus exists regarding the most appropriate methodology through which to achieve this. A number of modelling groups will be running isotope-enabled palaeoclimate simulations in the framework of the Coupled Model Intercomparison Project Phase 6, so it is timely to evaluate different approaches to using the speleothem data for data–model comparisons. Here, we illustrate this using 456 globally distributed speleothem δ18O records from an updated version of the Speleothem Isotopes Synthesis and Analysis (SISAL) database and palaeoclimate simulations generated using the ECHAM5-wiso isotope-enabled atmospheric circulation model. We show that the SISAL records reproduce the first-order spatial patterns of isotopic variability in the modern day, strongly supporting the application of this dataset for evaluating model-derived isotope variability into the past. However, the discontinuous nature of many speleothem records complicates the process of procuring large numbers of records if data–model comparisons are made using the traditional approach of comparing anomalies between a control period and a given palaeoclimate experiment. To circumvent this issue, we illustrate techniques through which the absolute isotope values during any time period could be used for model evaluation. Specifically, we show that speleothem isotope records allow an assessment of a model's ability to simulate spatial isotopic trends. Our analyses provide a protocol for using speleothem isotope data for model evaluation, including screening the observations to take into account the impact of speleothem mineralogy on δ18O values, the optimum period for the modern observational baseline and the selection of an appropriate time window for creating means of the isotope data for palaeo-time-slices.en_AU
dc.description.sponsorshipFinancial support for SISAL activities that have lead to this research has been provided by the Past Global Changes (PAGES) programme; the European Geosciences Union (grant no. W2017/413); the Irish Centre for Research in Applied Geosciences (iCRAG); the European Association of Geochemistry (Early Career Ambassadors program 2017); the Quaternary Research Association UK; the Navarino Environmental Observatory, Stockholm University; University College Dublin (grant no. SF1428), Savillex (UK); John Cantle; Ibn Zohr University, Morocco; the University of Reading; the European Research Council (grant no. 694481); the Natural Environment Research Council (JPI-Belmont project “PAleao-Constraints on Monsoon Evolution and Dynamics (PACMEDY)”); the Geological Survey Ireland (grant no. 2017-SC-056); the Royal Irish Academy (Charlemont Scholar award 2018); the Portuguese Science Foundation (grant no. UID/MAR/00350/2013); and the Deutsche Forschungsgemeinschaft (grant no. RE3994/2-1).en_AU
dc.format.mimetypeapplication/pdfen_AU
dc.identifier.issn1814-9324en_AU
dc.identifier.urihttp://hdl.handle.net/1885/217399
dc.language.isoen_AUen_AU
dc.provenance© Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License.en_AU
dc.publisherCopernicus GmbHen_AU
dc.rights© Author(s) 2019.en_AU
dc.rights.licenseCreative Commons Attribution 4.0 Licenseen_AU
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_AU
dc.sourceClimate of the Pasten_AU
dc.titleEvaluating model outputs using integrated global speleothem records of climate change since the last glacialen_AU
dc.typeJournal articleen_AU
dcterms.accessRightsOpen Accessen_AU
local.bibliographicCitation.issue4en_AU
local.bibliographicCitation.lastpage1579en_AU
local.bibliographicCitation.startpage1557en_AU
local.contributor.affiliationWurtzel, Jennifer, College of Science, ANUen_AU
local.contributor.affiliationComas-Bru, Laia, Reading Universityen_AU
local.contributor.affiliationHarrison, S.P., University of Readingen_AU
local.contributor.affiliationWerner, Martin, Helmholtz Centre for POlar and Marine Researchen_AU
local.contributor.affiliationRehfeld, Kira, Ruprecht-Karls-Universität Heidelbergen_AU
local.contributor.affiliationScroxton, Nick, University of Massachusettsen_AU
local.contributor.affiliationVeiga-Pires, Cristina, Universidade do Algarveen_AU
local.contributor.authoremailu5083225@anu.edu.auen_AU
local.contributor.authoruidWurtzel, Jennifer, u5083225en_AU
local.description.notesImported from ARIESen_AU
local.identifier.absfor040605 - Palaeoclimatologyen_AU
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciencesen_AU
local.identifier.ariespublicationu3102795xPUB4574en_AU
local.identifier.citationvolume15en_AU
local.identifier.doi10.5194/cp-15-1557-2019en_AU
local.identifier.thomsonIDWOS:000480317900001
local.identifier.uidSubmittedByu3102795en_AU
local.publisher.urlhttps://cp.copernicus.org/en_AU
local.type.statusPublished Versionen_AU

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