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PhD Defense

Véronique Mariotti-Epelbaum (LSCE)

Title : Carbon cycle in glacial times: mean state and variability

Date and time : The 16-10-2013 at 14h00

Type : thèse

Université qui délivre le diplôme : Université de Versailles Saint-Quentin

Location : CEA - Amphithéâtre Claude Bloch (bât. 773), Orme des Merisiers, Gif-sur-Yvette.
Members of jury :

Matthieu ROY-BARMAN (UVSQ-LSCE, Gif/Yvette)
Birgit SCHNEIDER (Université de Kiel, Allemagne) - Rapporteur
Fortunat JOOS (Université de Bern, Suisse) - Rapporteur
Laurence Vidal (CEREGE, Aix-en-Provence) - Examinateur
Laurent BOPP (LSCE, Gif/Yvette) - Directeur de thèse
Didier PAILLARD (LSCE, Gif/Yvette) - Co-directeur de thèse

Summary :

Atmospheric CO2 variations, of around 100 ppm, between glacial and interglacial climates, and 14C variations, are not well understood. This is also the case for the 20 ppm variations of CO2 associated to abrupt events at glacial times.

Combining both models and data, I have shown (1) that the sinking of brines mechanism - pockets of salt rejected by sea-ice formation - around Antarctica, likely able to explain glacial-interglacial CO2 variations according to previous studies, could also explain the 14C, (2) that an oscillation of this mechanism could also induce the 20 ppm variations of CO2 during abrupt events, (3) that marine productivity was correctly simulated on the glacial-interglacial time scale and during abrupts events and (4) that for both kinds of variations, it had a limited role on CO2.

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