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The fingerprint of the summer 2018 drought in Europe on ground-based atmospheric CO 2 measurements: Atmospheric CO 2 anomaly, Ramonet, M., Ciais P., Apadula F., Bartyzel J., Bastos A., Bergamaschi P., Blanc P.E., Brunner D., L. Di Torchiarolo Caracciolo, Calzolari F., et al. , Philosophical Transactions of the Royal Society B: Biological Sciences, Feb-10-2022, Volume 375, Issue 1810, Number 1810, p.20190513, (2020)