Session: Benchmarking & cross-cutting Group 1 (Isotope modelling, COMPARE)
Author: Laia Comas-Bru / email@example.com / UCD School of Earth Sciences, University College Dublin, Belfield, Dublin 4, Ireland
Co-author: Michael Deininger, UCD School of Earth Sciences, University College Dublin, Belfield, Dublin 4, Ireland;
Sandy P. Harrison, Centre for Past Climate Change, School of Archaeology, Geography and Environmental Sciences, University of Reading, Whiteknights, PO Box 227, Reading RG6 6AB, United Kingdom;
SISAL Working Group Members, ;
Speleothems can provide high-resolution records of changes in both climate and atmospheric composition. These records have the potential to be used to document regional changes in mean climate and climate variability on annual to centennial timescales. They can also be used to refine our understanding of regional changes in climate forcings, such as dust and volcanic aerosols, through time. Since many climate models now explicitly include isotopic tracers, the isotopic records from speleothems can also be used explicitly for model evaluation. Previous attempts to compile speleothem data have not provided a globally-comprehensive synthesis, nor have they provided rigorous assessments of measurement, chronological or interpretation uncertainties. SISAL (Speleothem Isotopes Synthesis and Analysis) is a new community-based working group sponsored by Past Global Changes (PAGES) to synthesise the 400+ speleothem isotopic records available globally and develop a public-access database, that can be used both to explore past climate changes and in model evaluation. In this presentation, we will showcase preliminary results of the SISAL synthesis of δ18O and δ13C records for the Last Glacial Maximum (21 ka), the mid-Holocene (6 ka) and the Last Millennium (850-1850 CE) and highlight robust signals that would be primary targets for model evaluation.