- Letter
- Published: 27 May 2012
- Benjamin Quesada1,2,
- Robert Vautard1,
- Pascal Yiou1,
- Martin Hirschi3,4 &
- …
- Sonia I. Seneviratne4
Nature Climate Change volume2,pages 736–741 (2012)Cite this article
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Abstract
The mega heatwaves that struck western Europe in 2003 (ref.1) and Russia in 2010 (ref.2) are thought to provide a foretaste of future European summer climate3,4,5,6,7. Our ability to anticipate such events remains poor8, limiting adequate society adaptation. A deficit of precipitation in the preceding months favours summer heatwaves9,10,11,12,13, but the potential predictability from spring surface-moisture deficits, addressed in only a few case studies8,14,15, largely remains to be investigated. By analysing 64 years of observed temperature and precipitation we show that rainy winter/spring seasons over southern Europe inhibit hot summer days whereas dry seasons are followed by either a high or a low frequency of hot days, generalizing findings obtained over southeastern Europe10. Observations indicate that summer heat is more sensitive to the occurrence of specific weather regimes in initially dry cases than wet cases, inducing this asymmetry in summer heat predictability. Then, simulations from the Coupled Model Intercomparison Project (ref.16 and J-L., Dufresne, manuscript in preparation) indicate that projected drier conditions over southern Europe are likely to induce a widening in the frequency distribution of hot summer days, as the wet winter/spring seasons are likely to become rare. These mechanisms are found to play an increasingly important role in coming decades, with more hot extremes and a modified hot-day predictability.
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References
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Acknowledgements
The authors are thankful to the engineer team of the Institut Pierre–Simon Laplace (IPSL) Climate Modelling Centre for having carried out and provided the simulations made in the framework of the CMIP5 project. In particular M-A. Foujols provided priority access to the latest IPSL-CM5A-MR simulations. The authors also benefitted from discussions with P. Braconnot, J. Cattiaux, F. D’Andrea and H. Douville.
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Authors and Affiliations
LSCE, IPSL, CEA, UVSQ, Orme des merisiers, 91191 Gif-sur-Yvette, France
Benjamin Quesada,Robert Vautard&Pascal Yiou
ARIA Technologies, 8-10 rue de la Ferme, 92100 Boulogne-Billancourt, France
Benjamin Quesada
Federal Office for Meteorology and Climatology, MeteoSwiss, Krähbühlstrasse 58, 8044 Zürich, Switzerland
Martin Hirschi
ETH Zurich, Institute for Atmospheric and Climate Science, Universitätsstrasse 16, CH-8092Zürich, Switzerland
Martin Hirschi&Sonia I. Seneviratne
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- Robert Vautard
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- Martin Hirschi
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- Sonia I. Seneviratne
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Contributions
B.Q. and R.V. designed the experiments and B.Q. carried out the observational and model statistical analyses. P.Y. advised the team and carried out the weather regime analysis. M.H. helped with the computation of additional rainfall indices. M.H. and S.I.S. helped to provide essential interpretations of the results. All authors contributed to the writing and correcting of the manuscript.
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Correspondence to Benjamin Quesada.
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Quesada, B., Vautard, R., Yiou, P. et al. Asymmetric European summer heat predictability from wet and dry southern winters and springs. Nature Clim Change 2, 736–741 (2012). https://doi.org/10.1038/nclimate1536
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DOI: https://doi.org/10.1038/nclimate1536
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