Articles | Volume 10, issue 2
Geosci. Model Dev., 10, 889–901, 2017

Special issue: Paleoclimate Modelling Intercomparison Project phase 4 (PMIP4)...

Geosci. Model Dev., 10, 889–901, 2017

Model experiment description paper 23 Feb 2017

Model experiment description paper | 23 Feb 2017

The DeepMIP contribution to PMIP4: experimental design for model simulations of the EECO, PETM, and pre-PETM (version 1.0)

Daniel J. Lunt1, Matthew Huber2, Eleni Anagnostou9, Michiel L. J. Baatsen3, Rodrigo Caballero4, Rob DeConto5, Henk A. Dijkstra3, Yannick Donnadieu6, David Evans31, Ran Feng8, Gavin L. Foster9, Ed Gasson5, Anna S. von der Heydt3, Chris J. Hollis10, Gordon N. Inglis32, Stephen M. Jones34, Jeff Kiehl29, Sandy Kirtland Turner11, Robert L. Korty12, Reinhardt Kozdon13, Srinath Krishnan7, Jean-Baptiste Ladant6, Petra Langebroek14, Caroline H. Lear15, Allegra N. LeGrande16, Kate Littler17, Paul Markwick18, Bette Otto-Bliesner8, Paul Pearson15, Christopher J. Poulsen19, Ulrich Salzmann20, Christine Shields8, Kathryn Snell21, Michael Stärz22, James Super7, Clay Tabor8, Jessica E. Tierney23, Gregory J. L. Tourte1, Aradhna Tripati33, Garland R. Upchurch24, Bridget S. Wade25, Scott L. Wing26, Arne M. E. Winguth27, Nicky M. Wright28, James C. Zachos29, and Richard E. Zeebe30 Daniel J. Lunt et al.
  • 1School of Geographical Sciences, University of Bristol, Bristol, UK
  • 2Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, USA
  • 3Institute for Marine and Atmospheric research Utrecht (IMAU), Utrecht University, Utrecht, Netherlands
  • 4Department of Meteorology (MISU), Stockholm University, Stockholm, Sweden
  • 5Department of Geosciences, University of Massachusetts, Amherst, USA
  • 6Laboratoire des Sciences du Climat et de l'Environnement, CNRS/CEA, Gif-sur-Yvette, France
  • 7Department of Geology and Geophysics, Yale University, New Haven, USA
  • 8National Centre for Atmospheric Research, Boulder, USA
  • 9Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, UK
  • 10GNS Science, Lower Hutt, Wellington, New Zealand
  • 11Department of Earth Sciences, University of California, Riverside, USA
  • 12Department of Atmospheric Sciences, Texas A&M University, College Station, USA
  • 13Lamont-Doherty Earth Observatory of Columbia University, Palisades, USA
  • 14Uni Research Climate, Bjerknes Centre for Climate Research, Bergen, Norway
  • 15School of Earth and Ocean Sciences, Cardiff University, Cardiff, UK
  • 16NASA-GISS, New York, USA
  • 17Camborne School of Mines, University of Exeter, Exeter, UK
  • 18Getech Group plc, Leeds, UK
  • 19Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, USA
  • 20Department of Geography, Northumbria University, Newcastle upon Tyne, UK
  • 21Department of Geological Sciences, University of Colorado, Boulder, USA
  • 22Alfred Wegener Institute, Bremerhaven, Germany
  • 23Department of Geosciences, University of Arizona, Tucson, USA
  • 24Department of Biology, Texas State University, San Marcos, USA
  • 25Department of Earth Sciences, University College London, London, UK
  • 26Department of Paleobiology, Smithsonian Institution, Washington, D.C., USA
  • 27Earth and Environmental Science, University of Texas, Arlington, USA
  • 28School of Geosciences, University of Sydney, Sydney, Australia
  • 29PBSci-Earth & Planetary Sciences Department, Institute of Marine Sciences, University of California, Santa Cruz, USA
  • 30Department of Oceanography, University of Hawaii at Manoa, USA
  • 31Department of Earth Sciences, University of St Andrews, St Andrews, UK
  • 32School of Chemistry, University of Bristol, Bristol, UK
  • 33Earth, Planetary, and Space Sciences, Atmospheric and Oceanic Sciences, Institute of the Environment and Sustainability, University of California, Los Angeles, USA
  • 34School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, UK

Abstract. Past warm periods provide an opportunity to evaluate climate models under extreme forcing scenarios, in particular high ( >  800 ppmv) atmospheric CO2 concentrations. Although a post hoc intercomparison of Eocene ( ∼  50  Ma) climate model simulations and geological data has been carried out previously, models of past high-CO2 periods have never been evaluated in a consistent framework. Here, we present an experimental design for climate model simulations of three warm periods within the early Eocene and the latest Paleocene (the EECO, PETM, and pre-PETM). Together with the CMIP6 pre-industrial control and abrupt 4 ×  CO2 simulations, and additional sensitivity studies, these form the first phase of DeepMIP – the Deep-time Model Intercomparison Project, itself a group within the wider Paleoclimate Modelling Intercomparison Project (PMIP). The experimental design specifies and provides guidance on boundary conditions associated with palaeogeography, greenhouse gases, astronomical configuration, solar constant, land surface processes, and aerosols. Initial conditions, simulation length, and output variables are also specified. Finally, we explain how the geological data sets, which will be used to evaluate the simulations, will be developed.

Short summary
In this paper we describe the experimental design for a set of simulations which will be carried out by a range of climate models, all investigating the climate of the Eocene, about 50 million years ago. The intercomparison of model results is called 'DeepMIP', and we anticipate that we will contribute to the next IPCC report through an analysis of these simulations and the geological data to which we will compare them.