A5041540294- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Cryospheric studies and observations
- Atmospheric and Environmental Gas Dynamics
- Geological Studies and Exploration
- Oceanographic and Atmospheric Processes
- Climate variability and models
- Tree-ring climate responses
- Marine and environmental studies
- Isotope Analysis in Ecology
- Pleistocene-Era Hominins and Archaeology
- Marine and coastal ecosystems
- Geological formations and processes
- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Groundwater and Isotope Geochemistry
- Clinical Nutrition and Gastroenterology
- Healthcare Systems and Challenges
- Winter Sports Injuries and Performance
- Ocean Acidification Effects and Responses
- Paleontology and Stratigraphy of Fossils
- Polar Research and Ecology
Laboratoire des Sciences du Climat et de l'Environnement
2020-2024
Université de Versailles Saint-Quentin-en-Yvelines
2020-2024
CEA Paris-Saclay
2020-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2020-2024
Centre National de la Recherche Scientifique
2020-2024
Institut Pierre-Simon Laplace
2020-2024
École Normale Supérieure de Lyon
2024
Université Paris-Saclay
2020-2022
Max Planck Institute for Meteorology
2022
Abstract. The Last Glacial Maximum (LGM, ∼ 21 000 years ago) has been a major focus for evaluating how well state-of-the-art climate models simulate changes as large those expected in the future using paleoclimate reconstructions. A new generation of used to generate LGM simulations part Paleoclimate Modelling Intercomparison Project (PMIP) contribution Coupled Model (CMIP). Here, we provide preliminary analysis and evaluation results these experiments (PMIP4, most which are PMIP4-CMIP6)...
Abstract. During the last deglaciation, climate evolves from a cold state at Last Glacial Maximum (LGM) 21 ka (thousand years ago) with large ice sheets to warm Holocene ∼9 reduced sheets. The deglacial sheet melt can impact through multiple ways: changes of topography and albedo, bathymetry coastlines, freshwater fluxes (FWFs). In PMIP4 (Paleoclimate Modelling Intercomparison Project – Phase 4) protocol for simulations, these be accounted or not depending on modelling group choices....
Abstract. Changes in water mass distribution are considered to be a significant contributor the atmospheric CO2 concentration drop around 186 ppm recorded during Last Glacial Maximum (LGM). Yet simulating glacial Atlantic Meridional Overturning Circulation (AMOC) agreement with paleotracer data remains challenge, most models from previous Paleoclimate Modelling Intercomparison Project (PMIP) phases showing tendency simulate strong and deep North Deep Water (NADW) instead of shoaling inferred...
Abstract. The Last Glacial Maximum (LGM, ~ 21,000 years ago) has been a major focus for evaluating how well state-of-the-art climate models simulate changes as large those expected in the future using paleoclimate reconstructions. A new generation of have used to generate LGM simulations part Palaeoclimate Modelling Intercomparison Project (PMIP) contribution Coupled Model (CMIP). Here we provide preliminary analysis and evaluation results these experiments (PMIP4-CMIP6) compare them with...
Abstract Model intercomparison studies of coupled carbon‐climate simulations have the potential to improve our understanding processes explaining drawdown at Last Glacial Maximum (LGM) and identify related model biases. Models participating in Paleoclimate Modeling Intercomparison Project (PMIP) now frequently include carbon cycle. The ongoing PMIP‐carbon project provides first opportunity conduct multimodel comparisons simulated content for LGM time window. However, such a study remains...
Abstract. The last deglaciation offers an unique opportunity to understand the climate–ice-sheet interactions in a global warming context. In this paper, tackle question, we use Earth system model of intermediate complexity coupled ice sheet covering Northern Hemisphere simulate and Holocene (26–0 ka). We synchronous coupling every year between rest climate ensure closed water cycle considering release freshwater flux ocean due melting. Our reference experiment displays gradual response...
Abstract. The last deglaciation offers an unique opportunity to understand the climate – ice sheet interactions in a global warming context. In this paper, tackle question, we use Earth system model of intermediate complexity coupled covering Northern Hemisphere simulate and Holocene (26–0 ka BP). We synchronous coupling every year between rest ensure closed water cycle considering release freshwater flux ocean due melting. Our reference experiment displays gradual response forcings, with no...
Abstract. The quaternary climate is characterised by glacial-interglacial cycles, with the most recent transition from last glacial maximum to present interglacial (the deglaciation) occurring between ~ 21 and 9 ka. While deglacial warming at southern high latitudes mostly in phase atmospheric CO2 concentrations, some proxy records have suggested that onset of occurred before increase. In addition, exhibit a cooling event middle deglaciation (15–13 ka) known as Antarctic Cold Reversal (ACR)....
Abstract. Changes in water mass distribution are considered to be a significant contributor the atmospheric CO2 concentration drop around 186 ppm recorded during Last Glacial Maximum (LGM). Yet simulating glacial Atlantic Meridional Overturning Circulation (AMOC) agreement with paleotracer data remains challenge, most models from previous Paleoclimate Modelling Intercomparison Project (PMIP) phases showing tendency simulate strong and deep North Deep Water (NADW) instead of shoaling inferred...
The ocean contained a larger carbon content at the Last Glacial Maximum (LGM, ~21kyr before present) compared to late Holocene, making considerable contribution deglacial atmospheric CO2 rise of about 90 ppm. Yet, there’s no consensus on mechanisms controlling glacial-interglacial changes in oceanic storage due uncertainties and sparseness proxy data. Numerical simulations have been widely used quantify impact key factors, such as sea surface temperatures, circulation biological...
The quaternary climate is characterised by glacial-interglacial cycles, with the most recent transition from last glacial maximum to present interglacial (the deglaciation) occurring between ~ 21 and 9 ka. While deglacial warming at southern high latitudes mostly in phase atmospheric CO2 concentrations, some proxy records have suggested that onset of occurred before increase. In addition, exhibit a cooling event middle deglaciation (15–13 ka) known as Antarctic Cold Reversal (ACR)....
Abstract. During the Last Deglaciation, climate evolves from a cold state at Glacial Maximum 21 ka with large ice sheets, to warm Holocene ~9 reduced sheets. The deglacial sheet melt can impact through multiple ways: changes of topography and albedo, bathymetry coastlines, as well fresh water fluxes. In PMIP4 protocol for simulations, these be accounted or not depending on modelling group choices. addition, two reconstructions are available (ICE-6G_C GLAC-1D). this study, we evaluate all...
The global carbon cycle is a complex system with many drivers, including slow ones such as the chemical weathering of rocks. At long enough timescales, changes in rates influence CO2 consumption, but also river loads carbon, nutrients, and alkalinity. In particular, ocean inventory alkalinity critical driver sequestration into ocean. Thus, any transitory imbalance between sources sinks can lead to chemistry impact atmospheric concentration. During last deglaciation (ca. 19-11 ka BP),...
<p>There is compelling evidence of a strong relation between the Atlantic Meridional Overturning Circulation (AMOC) and millennial scale climate variability during last glacial period. Part advances in understanding underlying mechanisms rely on analysis sedimentary Pa/Th ratio, which can be used to qualitatively infer past flow rates Atlantic. The compilation existing North records indicates repeated, consistent significant increases across millennial-scale events, indicating...
<p><span> At the interface of atmosphere and oceans, sea ice is a thin reactive layer which depends on surface temperatures two with significant impact both. In this vein, affects regional energy budget due to its high albedo, modulates transfer gas at ocean-atmosphere by simple presence modifies water column vertical structure through brine rejection during freezing freshwater input melting. As densification waters can lead deep formation, has an ocean...
Description of the semi-automated method to generate CLIO bathymetriesThis remplaces tedious manual changes that have been done on grid in past, order be able a bathymetry quickly from any topography file -a technical development which fastens start new PMIP phases and enables run transient simulations with an interactive bathymetry.It has used here (re)generate pre-industrial (using high resolution etopo1 topography), PMIP2 ICE-5G reconstruction), two PMIP4 bathymetries either GLAC-1D or...