Séminaire ISTerre

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Climatic insights into our future from past warm periods recorded in natural archives

jeudi 6 avril 2023 - 10h45

Emilie Capron (introduction: Gino de Gelder) - IGE Grenoble, médaille de bronze CNRS 2022
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The anthropogenic-induced high-latitude warming has global climatic implications due to polar ice mass loss, sea level rise and ocean circulation changes. To evaluate the risk of major current and future environmental changes, it is essential to explore climate dynamics and associated cryosphere and carbon cycle feedbacks that occurred during past warm time intervals. I would like to illustrate through this talk that the interglacials of the Quaternary recorded in natural archives are of particular interest in this context. They provide a basis for comparison with our current interglacial. Also, interglacials of the past 450 ka exhibit a polar warming comparable to that projected by 2100 due to specific combinations of orbital and CO2 forcing. In particular, I will use as a case-study the last interglacial (~129-116 thousand of years), a warm interval characterized by a global sea level 6-9 m higher than today. I will present the advances in characterizing the state of polar ice sheets as well as global and regional climate variations during this warm interval combining climate data syntheses from natural archives and outputs from state-of-the-art climate models. I will show that these results provide an improved understanding of the mechanisms and feedbacks occurring during a warmer-than-preindustrial context.

Replay du séminaire

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Equipe organisatrice : Grands Séminaires ISTerre

Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères

Informations de visio :

https://univ-grenoble-alpes-fr.zoom.us/j/94991233378?pwd=Y1RwbFJRSFM0ZVRzbkF4TnZkbVM3dz09
Meeting ID : 949 9123 3378
Passcode : 740890