A5003237366- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Methane Hydrates and Related Phenomena
- Climate variability and models
- Geological and Geophysical Studies
- Marine and coastal ecosystems
- Geological Studies and Exploration
- Oceanographic and Atmospheric Processes
- Geological formations and processes
- Hydrocarbon exploration and reservoir analysis
- Cryospheric studies and observations
- Evolution and Paleontology Studies
- Atmospheric and Environmental Gas Dynamics
- Isotope Analysis in Ecology
- Polar Research and Ecology
- Geological and Geochemical Analysis
- Species Distribution and Climate Change
- Geochemistry and Elemental Analysis
- Plant Water Relations and Carbon Dynamics
- Plant Diversity and Evolution
- Pleistocene-Era Hominins and Archaeology
- Arctic and Antarctic ice dynamics
- Geological Modeling and Analysis
- Marine Biology and Ecology Research
- Geological and Geophysical Studies Worldwide
Centre National de la Recherche Scientifique
2014-2024
CEA Paris-Saclay
2014-2024
Université de Versailles Saint-Quentin-en-Yvelines
2014-2024
Université Paris-Saclay
2016-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2014-2024
Laboratoire des Sciences du Climat et de l'Environnement
2015-2024
University of Michigan–Ann Arbor
2019-2022
UNSW Sydney
2022
Institute of Geography
2022
CEA Paris-Saclay - Etablissement de Saclay
2022
Abstract. We present results from an ensemble of eight climate models, each which has carried out simulations the early Eocene optimum (EECO, ∼ 50 million years ago). These have been in framework Deep-Time Model Intercomparison Project (DeepMIP; http://www.deepmip.org, last access: 10 January 2021); thus, all models configured with same paleogeographic and vegetation boundary conditions. The indicate that these non-CO2 conditions contribute between 3 5 ∘C to warmth. Compared previous...
Abstract. Past warm periods provide an opportunity to evaluate climate models under extreme forcing scenarios, in particular high ( > 800 ppmv) atmospheric CO2 concentrations. Although a post hoc intercomparison of Eocene ∼ 50 Ma) model simulations and geological data has been carried out previously, past high-CO2 have never evaluated consistent framework. Here, we present experimental design for three within the early latest Paleocene (the EECO, PETM, pre-PETM). Together with CMIP6...
Abstract The Ordovician glaciation represents the acme of one only three major icehouse periods in Earth's Phanerozoic history and is notorious for setting scene “big five” mass extinction events. Nevertheless, mechanisms that drove ice sheet growth remain poorly understood final extent crudely constrained. Here using an Earth system model with innovative coupling method between ocean, atmosphere, land accounting climate feedback processes, we report simulations portraying first time...
The continental scale initiation of the Antarctic ice sheet at Eocene-Oligocene boundary (Eocene-Oligocene transition (EOT), 34 Ma) is associated with a global reorganization climate. If data studies have assessed precise timing and magnitudes steps, modeling been unable to reproduce transient evolution during in agreement data. Here we simulate this using general circulation models coupled an model. Our simulations reveal threshold for glaciation 900 ppm, 100 150 ppm higher than previous...
Abstract. Based on the fifth phase of Coupled Model Intercomparison Project (CMIP5)-generation previous Institut Pierre Simon Laplace (IPSL) Earth system model, we designed a new version, IPSL-CM5A2, aiming at running multi-millennial simulations typical deep-time paleoclimate studies. Three priorities were followed during setup model: (1) improving overall model computing performance, (2) overcoming persistent cold bias depicted in generation and (3) making able to handle specific...
Abstract Earth's hydrological cycle is expected to intensify in response global warming, with a “wet‐gets‐wetter, dry‐gets‐drier” anticipated over the ocean. Subtropical regions (∼15°–30°N/S) are predicted become drier, yet proxy evidence from past warm climates suggests these may be characterized by wetter conditions. Here we use an integrated data‐modeling approach reconstruct and zonal‐mean rainfall patterns during early Eocene (∼56–48 million years ago). The Deep‐Time Model...
Abstract The historical view of a uniformly warm Cretaceous is being increasingly challenged by the accumulation new data hinting at possibility glacial events, even during Cenomanian–Turonian (∼95 Myr ago), warmest interval Cretaceous. Here we show that palaeogeography typifying renders Earth System resilient to glaciation with no perennial ice occurring under prescribed CO 2 levels as low 420 p.p.m. Conversely, late Aptian (∼115 ago) and Maastrichtian (∼70 continental configurations set...
Abstract The opening of the Drake Passage (DP) during Cenozoic is a tectonic event paramount importance for development modern ocean characteristics. Notably, it has been suggested that exerts primary role in onset Antarctic Circumpolar Current (ACC) formation, cooling high‐latitude South Atlantic waters and initiation North Deep Water (NADW) formation. Several model studies have aimed to assess impacts DP on climate, but most them focused surface only few used realistic Eocene boundary...
Abstract. The Cenozoic inception and development of the Asian monsoons remain unclear have generated much debate, as several hypotheses regarding circulation patterns at work in Asia during Eocene been proposed few last decades. These include (a) existence modern-like since early Eocene; (b) that a weak South monsoon (SAM) little to no East (EAM); or (c) prevalence Intertropical Convergence Zone (ITCZ) migrations, also referred Indonesian–Australian (I-AM). As SAM EAM are supposed triggered...
Abstract The first major build-up of Antarctic glaciation occurred in two consecutive stages across the Eocene–Oligocene transition (EOT): EOT-1 cooling event at ~34.1–33.9 Ma and Oi-1 ~33.8–33.6 Ma. Detailed orbital-scale terrestrial environmental responses to these events remain poorly known. Here we present magnetic geochemical climate records from northeastern Tibetan Plateau margin that are dated precisely ~35.5 31 by combined magneto- astro-chronology. These suggest a hydroclimate...
Abstract. Understanding of the role ocean circulation on climate during Late Cretaceous is contingent ability to reconstruct its modes and evolution. Geochemical proxies used infer past provide conflicting interpretations for reorganization through Cretaceous. Here, we present model simulations Cenomanian (100.5–93.9 Ma) Maastrichtian (72.1–66.1 stages with CCSM4 earth system model. We focus intermediate (500–1500 m) deep (> 1500 show that while there continuous deep-water production in...
Abstract Across the Miocene–Pliocene boundary (MPB; 5.3 million years ago, Ma), late Miocene cooling gave way to early-to-middle Pliocene Warm Period. This transition, across which atmospheric CO 2 concentrations increased levels similar present, holds potential for deciphering regional climate responses in Asia—currently home more than half of world’s population— global change. Here we find that -induced MPB warming both summer monsoon moisture transport over East Asia, and enhanced...
Usually overlooked orbital forcing unlocks persistent mismatch between model and paleobotanical data across the EOT.
Abstract Here, we compare the ocean overturning circulation of early Eocene (47–56 Ma) in eight coupled climate model simulations from Deep‐Time Model Intercomparison Project (DeepMIP) and investigate causes observed inter‐model spread. The most common global meridional (MOC) feature these is anticlockwise bottom cell, fed by sinking Southern Ocean. In North Pacific, one (GFDL) displays strong deepwater formation (CESM) shows weak formation, while Atlantic two models show signs intermediate...
Abstract. At the junction of greenhouse and icehouse climate states, Eocene–Oligocene Transition (EOT) is a key moment in Cenozoic history. While it associated with severe extinctions biodiversity turnovers on land, role terrestrial evolution remains poorly resolved, especially changes seasonality. Some paleobotanical geochemical continental records parts Northern Hemisphere suggest EOT marked cooling winter, leading to development more pronounced seasons (i.e., an increase mean annual range...
The Late Eocene is a period of global cooling and high-latitude tectonic changes culminating in the Oligocene Transition (34 Ma ago), one major climatic shifts Cenozoic. Across Eocene, Earth went from largely ice-free greenhouse during early optimum to an icehouse with ice sheet inception over Antarctica. This long-term happened simultaneously decrease atmospheric content carbon dioxide whose causes are still unclear. During same period, marine gateways surrounding Antarctica (Drake Passage...