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Evaluating model outputs using integrated global speleothem records of climate change since the last glacial
Univ Reading, Sch Archaeol Geog & Environm Sci, Reading RG6 6AH, Berks, England;Univ Coll Dublin, Sch Earth Sci, Dublin 4, Ireland.
Univ Reading, Sch Archaeol Geog & Environm Sci, Reading RG6 6AH, Berks, England.
Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, Climate Sci Div, Div Climate Sci Paleoclimate Dynam, Bussestr 24, D-27570 Bremerhaven, Germany.
Heidelberg Univ, Inst Environm Phys, Neuenheimer Feld 229, D-69120 Heidelberg, Germany.
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2019 (engelsk)Inngår i: Climate of the Past, ISSN 1814-9324, E-ISSN 1814-9332, Vol. 15, nr 4, s. 1557-1579Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Although 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 delta O-18 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 delta O-18 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.

sted, utgiver, år, opplag, sider
COPERNICUS GESELLSCHAFT MBH , 2019. Vol. 15, nr 4, s. 1557-1579
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Identifikatorer
URN: urn:nbn:se:uu:diva-393615DOI: 10.5194/cp-15-1557-2019ISI: 000480317900001OAI: oai:DiVA.org:uu-393615DiVA, id: diva2:1355168
Forskningsfinansiär
EU, European Research Council, 694481Tilgjengelig fra: 2019-09-27 Laget: 2019-09-27 Sist oppdatert: 2019-09-27bibliografisk kontrollert

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