Future equivalent of 2010 Russian heatwave intensified by weakening soil moisture constraints

L. M. Rasmijn, G. Schrier (), R. Bintanja, J. Barkmeijer, A. Sterl and W. Hazeleger
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L. M. Rasmijn: Royal Netherlands Meteorological Institute (KNMI)
G. Schrier: Royal Netherlands Meteorological Institute (KNMI)
R. Bintanja: Royal Netherlands Meteorological Institute (KNMI)
J. Barkmeijer: Royal Netherlands Meteorological Institute (KNMI)
A. Sterl: Royal Netherlands Meteorological Institute (KNMI)
W. Hazeleger: Wageningen University

Nature Climate Change, 2018, vol. 8, issue 5, 381-385

Abstract: Abstract The 2010 heatwave in eastern Europe and Russia ranks among the hottest events ever recorded in the region1,2. The excessive summer warmth was related to an anomalously widespread and intense quasi-stationary anticyclonic circulation anomaly over western Russia, reinforced by depletion of spring soil moisture1,3–5. At present, high soil moisture levels and strong surface evaporation generally tend to cap maximum summer temperatures6–8, but these constraints may weaken under future warming9,10. Here, we use a data assimilation technique in which future climate model simulations are nudged to realistically represent the persistence and strength of the 2010 blocked atmospheric flow. In the future, synoptically driven extreme warming under favourable large-scale atmospheric conditions will no longer be suppressed by abundant soil moisture, leading to a disproportional intensification of future heatwaves. This implies that future mid-latitude heatwaves analogous to the 2010 event will become even more extreme than previously thought, with temperature extremes increasing by 8.4 °C over western Russia. Thus, the socioeconomic impacts of future heatwaves will probably be amplified beyond current estimates.

Date: 2018
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DOI: 10.1038/s41558-018-0114-0

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