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Climate changes in polar and sub-polar regions during the Last Interglacial

Climate changes in polar and sub-polar regions during the Last Interglacial. Émilie CAPRON (British Antarctic Survey). Results presented in a paper currently under revision.

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Climate changes in polar and sub-polar regions during the Last Interglacial

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  1. Climate changes in polar and sub-polar regions during the Last Interglacial Émilie CAPRON (British Antarctic Survey) Results presented in a paper currently under revision Collaborators : A. Govin, E. J. Stone, V. Masson-Delmotte, S. Mulitza, B. Otto-Bliesner, L. C. Sime, C. Waelbroeck, E. W. Wolff

  2. Main points Whatweproduced : A synthesisof existingpaleoclimatic records covering the Last Interglacial (129 000-116 000 yearsago) Implications: • A temporal and spatial picture of the climatic changes in the high latitude regions • A useful benchmark for climatescientists to test Earth System modelsused for future climate and sealevelpredictions Icecore How wedidit : • Compilation of existing surface temperature records fromicecores and marine sedimentcores • Transfer of the paleoclimatic records onto a commonchronologyfor a precisecomparison of climatic variations from one site to the other Marine sedimentcore Results presented in a paper currently under revision

  3. Why this matters ? • The Last Interglacial • Most recent and best documentedpast warm time period • An opportunity to assessthe effect of warmerthanpresent-dayclimate on polar icesheets Antarctic temperature evolution Jouzel et al. Science 2007 • Polar and sub-polar regions • Witnesses and actors in climatic changes • A data synthesiswillenable to force modelswhichpredict how the melting of the icesheetscontribute to sealevelrise To assess the likely contribution of ice volume to future sealevel scenarios Results presented in a paper currently under revision

  4. What we did : Synthesis of existing air and sea surface temperature records 115 000 years 125 000 years 130 000 years 120 000 years UNPUBLISHED • A sequence of time slices representing thehigh-latitude climate variations • Asynchronoustemperature changes at the beginning of a warmer-than-present time period Results presented in a paper currently under revision

  5. What we did : Comparison with Last Interglacial climate model simulations 125 000 years ago Temperature anomaly relative to Modern-day (°C) Sea surface temperature UNPUBLISHED Reconstructed temperature (dots) superimposed onto simulated temperature from a climate model (background) Surface air temperature UNPUBLISHED Ourdata time slices represent unique targets for climate modelling for the Last Interglacial The “data” and “modeling” communities are working together to use the Past to help improving estimates about the Future. Results presented in a paper currently under revision

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