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Article Dans Une Revue Nature Communications Année : 2023

Moist and warm conditions in Eurasia during the last glacial of the Middle Pleistocene Transition

María Fernanda Sánchez Goñi
Josué Polanco-Martínez
Coralie Zorzi
Teresa Rodrigues
  • Fonction : Auteur
André Bahr

Résumé

Abstract The end of the Middle Pleistocene Transition (MPT, ~ 800-670 thousand years before present, ka) was characterised by the emergence of large glacial ice-sheets associated with anomalously warm North Atlantic sea surface temperatures enhancing moisture production. Still, the direction and intensity of moisture transport across Eurasia towards potential ice-sheets is poorly constrained. To reconstruct late MPT moisture production and dispersal, we combine records of upper ocean temperature and pollen-based Mediterranean forest cover, a tracer of westerlies and precipitation, from a subtropical drill-core collected off South-West Iberia, with records of East Asia summer monsoon (EASM) strength and West Pacific surface temperatures, and model simulations. Here we show that south-western European winter precipitation and EASM strength reached high levels during the Marine Isotope Stage 18 glacial. This anomalous situation was caused by nearly-continuous moisture supply from both oceans and its transport to higher latitudes through the westerlies, likely fuelling the accelerated expansion of northern hemisphere ice-sheets during the late MPT.
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hal-04374190 , version 1 (05-01-2024)

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María Fernanda Sánchez Goñi, Thomas Extier, Josué Polanco-Martínez, Coralie Zorzi, Teresa Rodrigues, et al.. Moist and warm conditions in Eurasia during the last glacial of the Middle Pleistocene Transition. Nature Communications, 2023, 14 (1), pp.2700. ⟨10.1038/s41467-023-38337-4⟩. ⟨hal-04374190⟩

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