Session: Benchmarking & cross-cutting Group 1 (Isotope modelling, COMPARE)
Author: Bronwen Konecky / firstname.lastname@example.org / CIRES, University of Colorado Boulder, USA
Co-author: Olga Churakova (Sidorova), (1) Institute for Environmental Sciences, University of Geneva, Switzerland; (2) Siberian Federal University, Krasnoyarsk, Russia;
Laia Comas-Bru, School of Earth Sciences, University College Dublin, Ireland;
Kristine L. DeLong, Department of Geography and Anthropology, Louisiana State University, USA;
Lukas Jonkers, MARUM, Universitaet Bremen, Germany;
Jud Partin, Institute for Geophysics, University of Texas Austin, USA;
Samantha Stevenson, National Center for Atmospheric Research, USA;
Diane M. Thompson, Department of Earth & Environment, Boston University, USA;
Jonathan J. Tyler, Department of Earth Sciences and Sprigg Geobiology Centre, The University of Adelaide, Australia;
Iso2k Project Members, ;
Much of our understanding of Earth’s hydro-climate history comes from proxies for the δ18O and δD of environmental waters (e.g., precipitation, seawater, groundwater, lake water, permafrost, ice). The δ18O and δD of environmental waters are recorded by sensors in a wide range of natural archives, such as glacier and ground ice, speleothems, corals, lake and marine sediments, and tree rings. Despite this diversity, reconstructed δ18O and δD can track common environmental signals such as moisture source and air mass transport history, precipitation characteristics, and temperature, and thus provide invaluable comparison targets for global climate models. However, no comprehensive synthesis of proxy δ18O or δD timeseries yet exists in a format suitable for regional-scale climate reconstructions or for comparison with model output.
The PAGES Iso2k project is creating a global database of paleo-δ18O and δD records for the Common Era based on a range of archives, with resolutions from annual to centennial, and with extensive metadata fields to facilitate interpretation and uncertainty quantification of the emergent hydroclimate signal(s). The database is being used to identify regional- and global-scale features in hydroclimate and atmospheric circulation during the past 2 kyr as well as their relationship with PAGES temperature reconstructions. As a formal project within the framework of PAGES2k Phases 2 and 3, the Iso2k effort is currently the only global, multi-archive hydroclimate database being constructed for the Common Era, with strong ties to other archive and climate target-specific groups within PAGES. Iso2k comprises the first steps towards a broader ‘Hydro2k’ synthesis.
Here, we present the status of the Iso2k database, a first look at initial results, and initial targets for data-model comparison using isotope-enabled Last Millennium simulations. The goal of this presentation is to introduce Iso2k to the broader PMIP4 community and to discuss plans for synergistic activities, such as an IsoMIP project for the Last Millennium and other time periods of interest.