Clim. Past Discuss., 5, 2053-2080, 2009
www.clim-past-discuss.net/5/2053/2009/
doi:10.5194/cpd-5-2053-2009
© Author(s) 2009. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Climate of the Past (CP). Please refer to the corresponding final paper in CP.
The importance of paleoclimate modelling for improving predictions of future climate change
J. C. Hargreaves and J. D. Annan
Global Change Projection Research Program, Research Institute for Global Change, JAMSTEC, 3173-25 Showa-machi, Kanazawa-ku, Yokohama City, Kanagawa, 236-0001, Japan

Abstract. We use an ensemble of runs from the MIROC3.2 AGCM with slab-ocean to explore the extent to which mid-Holocene simulations are relevant to predictions of future climate change. The results are compared with similar analyses for the Last Glacial Maximum (LGM) and pre-industrial control climate. We find evidence that the paleoclimate epochs can provide some independent validation of the models that is also relevant for future predictions. Considering the paleoclimate epochs, we find that the stronger global forcing and hence larger climate change at the LGM makes this likely to be the more powerful one for estimating the large-scale changes that are anticipated due to anthropogenic forcing. The regions from the mid-Holocene simulations which produce significant results (mid to high northern latitude land temperature and monsoon precipitation) do, however, coincide with areas where the LGM results are weak, and are also areas where the paleodata indicate significant climate changes have occurred. Thus, these areas should be a high priority for model improvement and validation.

Citation: Hargreaves, J. C. and Annan, J. D.: The importance of paleoclimate modelling for improving predictions of future climate change, Clim. Past Discuss., 5, 2053-2080, doi:10.5194/cpd-5-2053-2009, 2009.
 
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