Recent European drought extremes beyond Common Era background variability

@article{Bntgen2021RecentED,
  title={Recent European drought extremes beyond Common Era background variability},
  author={Ulf B{\"u}ntgen and Otmar Urban and Paul J Krusic and Michal Rybn{\'i}{\vc}ek and Tom{\'a}{\vs} Kol{\'a}ř and Tom{\'a}{\vs} Kyncl and Alexander A{\vc} and Eva Koňasov{\'a} and Josef {\vC}{\'a}slavsk{\'y} and Jan Esper and Sebastian Wagner and Matthias Saurer and Willy Tegel and Petr Dobrovoln{\'y} and Paolo Cherubini and Frederick Reinig and Miroslav Trnka},
  journal={Nature Geoscience},
  year={2021},
  volume={14},
  pages={190 - 196}
}
Europe’s recent summer droughts have had devastating ecological and economic consequences, but the severity and cause of these extremes remain unclear. Here we present 27,080 annually resolved and absolutely dated measurements of tree-ring stable carbon and oxygen (δ13C and δ18O) isotopes from 21 living and 126 relict oaks (Quercus spp.) used to reconstruct central European summer hydroclimate from 75 bce to 2018 ce. We find that the combined inverse δ13C and δ18O values correlate with the June… 

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