BRAHIM, Yassine Ait; WASSENBURG, Jasper; CRUZ, Francisco; SIFEDDINE, Abdel; SCHOLZ, Denis; BOUCHAOU, Lhoussaine; DASSIE, Emilie; JOCHUM, Klaus; EDWARDS, R. Lawrence; CHENG, Hai

doi:10.1038/s41598-018-35498-x

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BRAHIM, Yassine Ait
Xi'an Jiaotong University [Xjtu]

WASSENBURG, Jasper
Max Planck Institute for Chemistry [MPIC]

CRUZ, Francisco
Universidade de São Paulo = University of São Paulo [USP]

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Scientific Reports. 2018, vol. 8, n° 1, p. 17446

Résumé en anglais

Here we present a new composite record from two well-dated speleothem records from two caves in Northern Morocco. The high-resolution record covers the last millennium allowing to detect multi-decadal to centennial periodicities. Over the industrial period, δ18O values of our speleothems are shown to be dominated by the main mode of decadal variability in the North Atlantic region: the North Atlantic Oscillation (NAO). Statistical analyses confirm the previously reported multi-decadal variability related to the influence of the Atlantic Multidecadal Oscillation (AMO) in the region. High power and persistent centennial-scale periodicities, similar to the Vries-Suess 200-year solar cycle, are observed as well. Indeed, comparison between solar activity reconstructions and our record confirms the in-phase relationship on centennial time-scales. Low δ18O values, and hence negative phases of NAO that bring precipitation towards the Western Mediterranean, are observed during well-known solar minima periods. The results are consistent with previous models which describe low irradiance as a trigger for southward shifts of precipitation-bearing westerlies during winter.< Réduire

Mots clés en anglais

Palaeoclimate