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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-41
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-41
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model experiment description paper 06 Mar 2019

Model experiment description paper | 06 Mar 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

The penultimate deglaciation: protocol for PMIP4 transient numerical simulations between 140 and 127 ka, version 1.0

Laurie Menviel1,*, Emilie Capron2,3,*, Aline Govin4, Andrea Dutton5, Lev Tarasov6, Ayako Abe-Ouchi7, Russell N. Drysdale8,9, Philip L. Gibbard10, Lauren Gregoire11, Feng He12, Ruza F. Ivanovic11, Masa Kageyama4, Kenji Kawamura13,14,15, Amaelle Landais4, Bette L. Otto-Bliesner16, Ikumi Oyabu13, Polychronis C. Tzedakis17, Eric Wolff18, and Xu Zhang19,20 Laurie Menviel et al.
  • 1Climate Change Research Center, PANGEA, the University of New South Wales, Sydney, Australia
  • 2Physics of Ice, Climate and Earth, Niels Bohr Institute, University of Copenhagen, Tagensvej 8, 2100 Copenhagen, Denmark
  • 3British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK
  • 4Laboratoire des Sciences du Climat et de l’Environnement (LSCE), Institut Pierre Simon Laplace (IPSL), CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-Sur-Yvette, 91190, France
  • 5Department of Geological Sciences, University of Florida, P.O. Box 112120, Gainesville, FL 32611, USA
  • 6Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St John’s, Canada
  • 7Atmosphere and Ocean Research Institute, The University of Tokyo, Tokyo, Japan
  • 8School of Geography, The University of Melbourne, Melbourne, Australia
  • 9Laboratoire EDYTEM UMR CNRS 5204, Université Savoie Mont Blanc, 73376 Le Bourget du Lac, France
  • 10Scott Polar Research Institute, University of Cambridge, Cambridge, CB2 1ER, UK
  • 11School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK
  • 12Center for Climatic Research, Nelson Institute for Environmental Studies, University of Wisconsin-Madison, Madison, WI 53706, USA
  • 13National Institute of Polar Research, Research Organizations of Information and Systems, 10-3 Midori-cho, Tachikawa,Tokyo 190-8518, Japan
  • 14Department of Polar Science, Graduate University for Advanced Studies (SOKENDAI), 10-3 Midori-cho, Tachikawa,Tokyo 190-8518, Japan
  • 15Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
  • 16Climate and Global Dynamics Laboratory, National Center for Atmospheric Research (NCAR), Boulder, CO 80305, USA
  • 17Environmental Change Research Centre, Department of Geography, University College London, London, UK
  • 18Department of Earth Sciences, University of Cambridge, Cambridge, CB2 3EQ, UK
  • 19Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, 27570 Bremerhaven, Germany
  • 20Key Laboratory of Western China’s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China
  • *Both authors contributed equally to this work.

Abstract. The penultimate deglaciation (PDG, ~ 138–128 thousand years before present, hereafter ka) is the transition from the penultimate glacial maximum to the Last Interglacial (LIG, ~ 129–116 ka). The LIG stands out as one of the warmest interglacials of the last 800 ka, with high-latitude temperature warmer than today and global sea level likely higher by at least 6 meters. Considering the transient nature of the Earth system, the LIG climate and ice-sheets evolution were certainly influenced by the changes occurring during the penultimate deglaciation. It is thus important to investigate, with coupled Atmosphere-Ocean General Circulation Models (AOGCMs), the climate and environmental response to the large changes in boundary conditions (i.e. orbital configuration, atmospheric greenhouse gas concentrations, ice-sheet geometry, and associated meltwater fluxes) occurring during the penultimate deglaciation.

A deglaciation working group has recently been set up as part of the Paleoclimate Modelling Intercomparison Project (PMIP) phase 4, with a protocol to perform transient simulations of the last deglaciation (19–11 ka; although the protocol covers 26–0 ka). Similar to the last deglaciation, the disintegration of continental ice-sheets during the penultimate deglaciation led to significant changes in the oceanic circulation during Heinrich Stadial 11 (~ 136–129 ka). However, the two deglaciations bear significant differences in magnitude and temporal evolution of climate and environmental changes.

Here, as part of the PAGES-PMIP working group on Quaternary Interglacials, we propose a protocol to perform transient simulations of the penultimate deglaciation under the auspices of PMIP4. This design includes time-varying changes in orbital forcing, greenhouse gas concentrations, continental ice-sheets as well as freshwater input from the disintegration of continental ice-sheets. This experiment is designed for AOGCMs to assess the coupled response of the climate system to all forcings. Additional sensitivity experiments are proposed to evaluate the response to each forcing. Finally, a selection of paleo records representing different parts of the climate system is presented, providing an appropriate benchmark for upcoming model-data comparisons across the penultimate deglaciation.

Laurie Menviel et al.
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Here, as part of the PAGES-PMIP working group on Quaternary Interglacials, we propose a protocol to perform transient simulations of the penultimate deglaciation under the auspices of PMIP4. This design includes time-varying changes in orbital forcing, greenhouse gas concentrations, continental ice-sheets as well as freshwater input from the disintegration of continental ice-sheets. This experiment is designed for AOGCMs to assess the coupled response of the climate system to all forcings.
Here, as part of the PAGES-PMIP working group on Quaternary Interglacials, we propose a protocol...
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