A5060070041- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Geological formations and processes
- Geological Studies and Exploration
- Geological and Geophysical Studies
- Hydrocarbon exploration and reservoir analysis
- Cryospheric studies and observations
- Pleistocene-Era Hominins and Archaeology
- Oceanographic and Atmospheric Processes
- Marine and coastal ecosystems
- Paleontology and Stratigraphy of Fossils
- Marine and environmental studies
- Marine Biology and Ecology Research
- Geophysics and Gravity Measurements
- Arctic and Antarctic ice dynamics
- Groundwater and Isotope Geochemistry
- Atmospheric and Environmental Gas Dynamics
- Archaeology and ancient environmental studies
- Climate change and permafrost
- Climate variability and models
- Astro and Planetary Science
- Geological Modeling and Analysis
- Advanced Computational Techniques and Applications
- Maritime and Coastal Archaeology
Centre National de la Recherche Scientifique
2016-2025
Sorbonne Université
2020-2025
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
2020-2025
Institut de Recherche pour le Développement
2020-2025
Institut Pierre-Simon Laplace
2006-2023
CEA Paris-Saclay
2012-2022
Laboratoire des Sciences du Climat et de l'Environnement
2013-2022
Université de Versailles Saint-Quentin-en-Yvelines
2013-2022
Université Paris-Saclay
2016-2022
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2013-2022
Past glacial-interglacial increases in the concentration of atmospheric carbon dioxide (CO2) are thought to arise from rapid release CO2 sequestered deep sea, primarily via Southern Ocean. Here, we present radiocarbon evidence Atlantic sector Ocean that strongly supports this hypothesis. We show during last glacial period, water circulating around Antarctica was more than two times older today relative atmosphere. During deglaciation, dissipation old and presumably CO2-enriched played an...
Abstract. The EPICA (European Project for Ice Coring in Antarctica) Dome C drilling East Antarctica has now been completed to a depth of 3260 m, at only few meters above bedrock. Here we present the new EDC3 chronology, which is based on use 1) snow accumulation and mechanical flow model, 2) set independent age markers along core. These are obtained by pattern matching recorded parameters either absolutely dated paleoclimatic records, or insolation variations. We show that this time scale...
Abstract Rapid changes in ocean circulation and climate have been observed marine-sediment ice cores over the last glacial period deglaciation, highlighting non-linear character of system underlining possibility rapid shifts response to anthropogenic greenhouse gas forcing. To date, these are still not fully explained. One obstacle hindering progress our understanding interactions between past is difficulty accurately dating marine cores. Here, we present a set 92 sediment from Atlantic...
To develop a better understanding of the abrupt Dansgaard‐Oeschger mode climate change, it is essential that we establish whether ice sheets are actively involved, as trigger or amplifier, they merely respond in passive manner. This requires careful assessment fundamental issues magnitude and phasing global volume fluctuations within marine isotope stage 3 (MIS 3), which to date remain enigmatic. We review recent advances observational studies pertaining these key discuss implications for...
The Last Interglacial (LIG, 129–116 thousand of years BP, ka) represents a test bed for climate model feedbacks in warmer-than-present high latitude regions. However, mainly because aligning different palaeoclimatic archives and from parts the world is not trivial, spatio-temporal picture LIG temperature changes difficult to obtain. Here, we have selected 47 polar ice core sub-polar marine sediment records developed strategy align them onto recent AICC2012 chronology. We provide first...
The Last Interglacial (LIG) represents an invaluable case study to investigate the response of components Earth system global warming. However, scarcity absolute age constraints in most archives leads extensive use various stratigraphic alignments different reference chronologies. This feature sets limitations accuracy assignment climatic sequence events across globe during LIG. Here, we review strengths and methods that are commonly used date or develop chronologies for time span (∼140–100...
Abstract Millennial-scale climate changes during the last glacial period and deglaciation were accompanied by rapid in atmospheric CO 2 that remain unexplained. While role of Southern Ocean as a 'control valve' on ocean–atmosphere exchange has been emphasized, exact nature this role, particular relative contributions physical (for example, ocean dynamics air–sea gas exchange) versus biological processes export productivity), remains poorly constrained. Here we combine reconstructions...
Well‐dated benthic foraminifer oxygen isotopic records ( δ 18 O) from different water depths and locations within the Atlantic Ocean exhibit distinct patterns significant differences in timing over last deglaciation. This has two implications: on one hand, it confirms that O cannot be used as a global correlation tool with millennial‐scale precision, but other combination of independent dating provides wealth information past circulation changes. Comparing new South data published records,...
Abstract. Although the Last Interglacial (LIG) is often considered as a possible analogue for future climate in high latitudes, its precise evolution and associated causes remain uncertain. Here we compile high-resolution marine sediment records from North Atlantic, Labrador Sea, Norwegian Sea Southern Ocean. We document delay establishment of peak interglacial conditions Seas compared to In particular, observe persistent iceberg melting at northern latitudes beginning LIG. It with (1)...
Significance This study sheds light on the mechanisms of deglacial atmospheric CO 2 rise and, more specifically, hypothesized role a “bipolar seesaw” in deep Atlantic ventilation. Comparing new high-resolution radiocarbon reconstructions from Northeast with existing data Southern Ocean, we show that bipolar ventilation seesaw did indeed operate during last deglaciation. Whereas today Atlantic’s carbon pool is “flushed” north by North Deep Water export, it was flushed instead south Heinrich...
A new method of past sea surface temperature (SST) reconstruction based on the modern analog technique (Prell, 1985) and indirect approach (Bartlein et al., 1986) has been developed: revised (RAM). Applied to planktonic foraminifera, this leads significant improvements in SST with respect former methods: our estimates are characterized by much lower residuals a better coverage observed range. Moreover, error RAM SSTs is than that associated reconstructions, particularly at middle high...
We investigated deep water changes in the Southern Ocean during last glacial inception, relationship to surface hydrology and global climatology, better understand mechanisms of establishment a ocean circulation. Changes benthic foraminiferal δ 13 C from three high‐resolution cores are compared indicate decoupled intermediate Ocean. From comparison with records North Atlantic, South Ocean, we show that early southern drop observed at MIS 5.5–5.4 transition occurred before any significant...