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Climate of the Past An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/cp-2019-172
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2019-172
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 17 Jan 2020

Submitted as: research article | 17 Jan 2020

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This preprint is currently under review for the journal CP.

PMIP4/CMIP6 Last Interglacial simulations using different versions of MIROC, with and without vegetation feedback

Ryouta O'ishi1, Wing-Le Chan1, Ayako Abe-Ouchi1,2,3, Sam Sherriff-Tadano1, and Rumi Ohgaito3 Ryouta O'ishi et al.
  • 1Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, 2778568, Japan
  • 2National Institute of Polar Research, Tachikawa, 1908518, Japan
  • 3Japan Agency for Marine-Earth Science and Technology, Yokohama, 2360001, Japan

Abstract. We carry out a Last Interglacial (LIG) experiment, named lig127k and a Tier1 experiment of PMIP4/CMIP6, using three versions of the MIROC model, MIROC4m, MIROC4m-LPJ and MIROC-ES2L. The results are compared with reconstructions from climate proxy data. All models show summer warming over northern high latitude land, reflecting the differences between the distributions of the LIG and present-day solar irradiance. Only MIROC4m-LPJ, which includes dynamical vegetation feedback from the change in vegetation distribution, shows warming signals, even for the annual mean, at northern high latitudes, as shown by proxy data. However, the latest Earth System Model (ESM) of MIROC, MIROC-ES2L, in which there is only a partial vegetation effect through the leaf area index, shows no change or even annual cooling over large parts of the northern hemisphere. Results from the series of experiments show that the inclusion of vegetation feedback is necessary for the reproduction of the strong annual warming over land at northern high latitudes. The LIG experimental results show that the warming predicted by models is still underestimated, even with dynamical vegetation, compared to reconstructions from proxy data, suggesting that further investigation and improvement to the climate feedback mechanism are needed.

Ryouta O'ishi et al.

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Latest update: 26 Feb 2020
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Short summary
The Last Interglacial is known as the warmest period in the recent glacial-interglacial cycle. We carry out a Last Interglacial experiment using three versions of general circulation models to reproduce the warm climate indicated by geological evidences. Our result clearly shows that vegetation change in the Last Interglacial is a necessary factor to predict a strong warming in northern high latitude which is indicated by geological evidences.
The Last Interglacial is known as the warmest period in the recent glacial-interglacial...
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