LANDAIS, Amaelle; STENNI, B.; MASSON-DELMOTTE, V.; JOUZEL, J.; CAUQUOIN, A.; FOURRÉ, E.; MINSTER, B.; SELMO, E.; EXTIER, Thomas; WERNER, M.; VIMEUX, F.; UEMURA, R.; CROTTI, I.; GRISART, A.

doi:10.1038/s41561-021-00856-4

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LANDAIS, Amaelle
Glaces et Continents, Climats et Isotopes Stables [GLACCIOS]

STENNI, B.
Department of Environmental Sciences, Informatics and Statistics [Venezia]

MASSON-DELMOTTE, V.
Glaces et Continents, Climats et Isotopes Stables [GLACCIOS]

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Article de revue

Ce document a été publié dans

Nature Geoscience. 2021-11-29, vol. 14, p. 918-923

Résumé en anglais

Succession of cold glacials and warm interglacials during the Quaternary results from large global climate responses to variable orbital configurations, accompanied by fluctuating greenhouse gas concentrations. Despite the influences of sea ice and atmospheric and ocean circulations in the Southern Ocean on atmospheric CO2 concentrations and climate, past changes in this region remain poorly documented. Here, we present the 800 ka deuterium excess record from the East Antarctica EPICA Dome C ice core, tracking sea surface temperature in evaporative regions of the Indian sector of the Southern Ocean from which moisture precipitated in East Antarctica is derived. We find that low obliquity leads to surface warming in evaporative moisture source regions during each glacial inception, although this relative temperature increase is counterbalanced by global cooling during glacial maxima. Links between the two regions during interglacials depends on the existence of a temperature maximum at the interglacial onset. In its absence, temperature maxima in the evaporative moisture source regions and in East Antarctica were synchronous. For the other interglacials, temperature maxima in the source areas lag early local temperature maxima by several thousand years, probably because of a change in the position of the evaporative source areas.< Réduire

Mots clés en anglais

Cryospheric science

Palaeoclimate

URI

https://oskar-bordeaux.fr/handle/20.500.12278/188228

DOI

http://dx.doi.org/10.1038/s41561-021-00856-4

Projet Européen

Collaborative Research: Recurring Patterns in Molecular Science: Reusable Learning Resources

Project ANR

450-350 ka : un seuil dans l'évolution humaine ? Comprendre les racines du monde néandertalien - ANR-19-CE27-0011

Unités de recherche

EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805