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Mega-heatwave temperatures due to combined soil desiccation and atmospheric heat accumulation

Abstract

The recent European mega-heatwaves of 2003 and 2010 broke temperature records across Europe1,2,3,4,5. Although events of this magnitude were unprecedented from a historical perspective, they are expected to become common by the end of the century6,7. However, our understanding of extreme heatwave events is limited and their representation in climate models remains imperfect8. Here we investigate the physical processes underlying recent mega-heatwaves using satellite and balloon measurements of land and atmospheric conditions from the summers of 2003 in France and 2010 in Russia, in combination with a soil–water–atmosphere model. We find that, in both events, persistent atmospheric pressure patterns induced land–atmosphere feedbacks that led to extreme temperatures. During daytime, heat was supplied by large-scale horizontal advection, warming of an increasingly desiccated land surface and enhanced entrainment of warm air into the atmospheric boundary layer. Overnight, the heat generated during the day was preserved in an anomalous kilometres-deep atmospheric layer located several hundred metres above the surface, available to re-enter the atmospheric boundary layer during the next diurnal cycle. This resulted in a progressive accumulation of heat over several days, which enhanced soil desiccation and led to further escalation in air temperatures. Our findings suggest that the extreme temperatures in mega-heatwaves can be explained by the combined multi-day memory of the land surface and the atmospheric boundary layer.

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Figure 1: Summer soil moisture–temperature coupling during 1980–2011 in Europe.
Figure 2: Air temperature and soil moisture in Europe during recent mega-heatwave summers.
Figure 3: ABL conditions during recent mega-heatwaves.
Figure 4: Land–atmosphere interactions during mega-heatwaves revisited.

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Acknowledgements

This work is partly funded by the European Space Agency (ESA) WACMOS-ET project (contract no. 4000106711/12/I-NB). A.J.T. acknowledges support from The Netherlands Organization for Scientific Research (Veni grant 016.111.002). We thank R. d. Jeu for his feedback on the interpretation of soil moisture data, and W. v. d. Berg and J. Wisse for the interpretation of the synoptic situation. We acknowledge the University of Wyoming for making the balloon sounding data available at http://weather.uwyo.edu/upperair/sounding.html.

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D.G.M., A.J.T. and J.V-G.d.A. jointly designed the study. D.G.M. led the large-scale analyses, A.J.T. the study of the sounding profiles, and J.V-G.d.A. the model experiments. C.C.v.H. contributed to the development of the atmospheric model. All co-authors contributed to the writing of the manuscript and the discussion and interpretation of results.

Corresponding author

Correspondence to Diego G. Miralles.

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The authors declare no competing financial interests.

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Miralles, D., Teuling, A., van Heerwaarden, C. et al. Mega-heatwave temperatures due to combined soil desiccation and atmospheric heat accumulation. Nature Geosci 7, 345–349 (2014). https://doi.org/10.1038/ngeo2141

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