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

Authors: Comas-Bru, Laia; Harrison, Sandy P.; Werner, Martin; Rehfeld, Kira; Scroxton, Nick; C. Veiga-Pires, C.; Ahmad, Syed Masood; +81 Authors

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

Abstract

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. European Geosciences Union - W2017/413; Irish Centre for Research in Applied Geosciences (iCRAG); European Association of Geochemistry (Early Career Ambassadors program 2017); Quaternary Research Association UK; Navarino Environmental Observatory, Stockholm University; University College Dublin, Savillex (UK) - SF1428; Ibn Zohr University, Morocco; University of Reading; European Research Council - 694481; Natural Environment Research Council (JPI-Belmont project "PAleao-Constraints on Monsoon Evolution and Dynamics (PACMEDY)"); Geological Survey Ireland - 2017-SC-056; Royal Irish Academy; Deutsche Forschungsgemeinschaft - RE3994/2-1; Past Global Changes (PAGES) programme; info:eu-repo/semantics/publishedVersion

Countries
Singapore, Germany, Germany, Italy, Portugal, United Kingdom, Belgium, Sweden
Subjects by Vocabulary

Microsoft Academic Graph classification: Time windows Glacial period geography.geographical_feature_category Climatology δ18O Climate change Speleothem Baseline (configuration management) Coupled model intercomparison project geography Spatial ecology Environmental science

Dewey Decimal Classification: ddc:550

Library of Congress Subject Headings: lcsh:TD169-171.8 lcsh:Environmental sciences lcsh:GE1-350 lcsh:TD172-193.5 lcsh:Environmental protection lcsh:Environmental pollution

Keywords

Growth frequency variations, Stratigraphy, F800, Palaeoclimate, Asian Monsoon, Klimatforskning, STABLE-ISOTOPE VARIATIONS, Meteorology & Atmospheric Sciences, ASIAN MONSOON, Speleothem Records, Geosciences, Multidisciplinary, DELTA-O-18 WATER ISOTOPE, General-circulation model, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Global and Planetary Change, Geology, Speleothem, PMIP4 contribution, OXYGEN-ISOTOPE, [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology, Physical Sciences, Institut für Geowissenschaften, High-resolution, ATMOSPHERIC CIRCULATION, North-Atlantic, Climate Research, [SDE.MCG]Environmental Sciences/Global Changes, Climate Change, PMIP4 CONTRIBUTION, :Geology [Science], Atmospheric circulation, Stable-isotope variations, GENERAL-CIRCULATION MODEL, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, Science & Technology, Paleontology, Model testing, GROWTH FREQUENCY VARIATIONS, Oxygen-isotope, NORTH-ATLANTIC, Delta-O-18 water isotope, HIGH-RESOLUTION

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    38
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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download
citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
views
OpenAIRE UsageCountsViews provided by UsageCounts
downloads
OpenAIRE UsageCountsDownloads provided by UsageCounts
38
Top 10%
Average
Top 10%
226
417
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gold
Funded by
EC| GC2.0
Project
GC2.0
Global Change 2.0: Unlocking the past for a clearer future
  • Funder: European Commission (EC)
  • Project Code: 694481
  • Funding stream: H2020 | ERC | ERC-ADG
Validated by funder
,
FCT| Centre for Marine and Environmental Research
Project
  • Funder: Fundação para a Ciência e a Tecnologia, I.P. (FCT)
  • Project Code: UID/MAR/00350/2013
  • Funding stream: 6817 - DCRRNI ID
sysimport:crosswalk:repository
,
University College Dublin
Project
  • Funder: University College Dublin
,
Royal Irish Academy
Project
  • Funder: Royal Irish Academy
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