A5018473015- Planetary Science and Exploration
- Astro and Planetary Science
- Space Exploration and Technology
- Cryospheric studies and observations
- Space Science and Extraterrestrial Life
- Geology and Paleoclimatology Research
- Meteorological Phenomena and Simulations
- Scientific Research and Discoveries
- Spaceflight effects on biology
- Atmospheric and Environmental Gas Dynamics
- Climate variability and models
- Atmospheric aerosols and clouds
- Arctic and Antarctic ice dynamics
- Atmospheric chemistry and aerosols
- Methane Hydrates and Related Phenomena
- Aeolian processes and effects
- Geological Studies and Exploration
- Atmospheric Ozone and Climate
- Climate change and permafrost
- Paleontology and Stratigraphy of Fossils
- Polar Research and Ecology
- Stellar, planetary, and galactic studies
- Geological and Geochemical Analysis
- Marine and environmental studies
- Spacecraft and Cryogenic Technologies
Laboratoire de Météorologie Dynamique
2014-2024
Sorbonne Université
2012-2024
Centre National de la Recherche Scientifique
2014-2024
École Polytechnique
2017-2024
Université Paris Sciences et Lettres
2017-2024
École Normale Supérieure - PSL
2017-2024
Institut Pierre-Simon Laplace
2010-2021
Linares Medical Devices (United States)
2021
Institut Polytechnique de Paris
2020
Université Paris-Saclay
2017
Abstract This study presents the global climate model IPSL‐CM6A‐LR developed at Institut Pierre‐Simon Laplace (IPSL) to natural variability and response anthropogenic forcings as part of sixth phase Coupled Model Intercomparison Project (CMIP6). article describes different components, their coupling, simulated in comparison previous versions. We focus here on representation physical along with main characteristics carbon cycle. The model's climatology, assessed from a range metrics (related...
Water ice clouds play a key role in the radiative transfer of Martian atmosphere, impacting its thermal structure, circulation, and, turn, water cycle. Recent studies including effects global climate models (GCMs) have found that corresponding feedbacks amplify model defaults. In particular, it prevents with simple microphysics from reproducing even basic characteristics Within context, we propose new implementation cycle GCMs, detailed cloud taking into account nucleation on dust particles,...
Abstract This study presents the version of LMDZ global atmospheric model used as component Institut Pierre Simon Laplace coupled (IPSL‐CM6A‐LR) to contribute 6th phase international Coupled Model Intercomparison Project (CMIP6). LMDZ6A includes original convective parameterizations that define “New Physics”: a mass flux parameterization organized structures boundary layer, “thermal plume model,” and cold pools created by reevaporation rainfall. The vertical velocity associated with thermal...
[1] Airborne dust is the main driver of Martian atmospheric temperature, and accurately accounting for its radiative effect in Global Climate Models (GCMs) essential. This requires modeling distribution properties, when trying to simulate true climate variability, use observed column opacity guide model. A recurrent problem has been inability Mars GCMs predict realistic temperatures while using both properties opacity. One would have drive model with a tuned reach an agreement observations,...
It has been suggested that the recently discovered exoplanet GJ581d might be able to support liquid water due its relatively low mass and orbital distance. However, receives 35% less stellar energy than Mars is probably locked in tidal resonance, with extremely insolation at poles possibly a permanent night side. Under such conditions, it unknown whether any habitable climate on planet would withstand global glaciation / or atmospheric collapse. Here we present three-dimensional simulations...
Radiatively active water ice clouds (RAC) play a key role in shaping the thermal structure of Martian atmosphere. In this paper, RAC are implemented LMD Mars Global Climate Model (GCM) and simulated temperatures compared to Thermal Emission Spectrometer observations over full year. change temperature gradients global dynamics atmosphere turn implies large‐scale adiabatic changes. Therefore, have both direct indirect effect on atmospheric temperatures. successfully reduce major GCM biases,...
Snowfall in Antarctica is a key term of the ice sheet mass budget that influences sea level at global scale. Over continental margins, persistent katabatic winds blow all year long and supply lower troposphere with unsaturated air. We show this dry air leads to significant low-level sublimation snowfall. found using unprecedented data collected over 1 on coast Adélie Land simulations from different atmospheric models accounts for 17% reduction total snowfall continent up 35% margins East...
Abstract. The first results of a campaign intensive observation precipitation in Dumont d'Urville, Antarctica, are presented. Several instruments collected data from November 2015 to February 2016 or longer, including polarimetric radar (MXPol), Micro Rain Radar (MRR), weighing gauge (Pluvio2), and Multi-Angle Snowflake Camera (MASC). These the ground-based measurements region Adélie Land (Terre Adélie), microphysics. Microphysical observations during austral summer 2015/2016 showed that,...
Abstract The development of parameterizations is a major task in the weather and climate models. Model improvement has been slow past decades, due to difficulty encompassing key physical processes into parameterizations, but also calibrating or “tuning” many free parameters involved their formulation. Machine learning techniques have recently used for speeding up process. While some studies propose replace by data‐driven neural networks, we rather advocate that keeping reliability...
The recently discovered exoplanet Gl581d is extremely close to the outer edge of its system's habitable zone, which has led much speculation on possible climate. We have performed a range simulations assess whether, given simple combinations chemically stable greenhouse gases, planet could sustain liquid water surface. For best estimates surface gravity, albedo and cloud coverage, we find that less than 10 bars CO2 sufficient maintain global mean temperature above melting point water....
Abstract Global climate models (GCMs) have been successfully employed to explain the origin of many glacial deposits on Mars. However, latitude‐dependent mantle (LDM), a dust‐ice mantling deposit that is thought represent recent “Ice Age,” remains poorly explained by GCMs. We reexamine this question considering effect radiatively active water‐ice clouds (RACs) and cloud microphysics. find when obliquity set 35°, as often occurred in past 2 million years, warming atmosphere polar caps...
Airborne dust is the main climatic agent in Martian environment. Local storms play a key role cycle; yet their life cycle poorly known. Here we use mesoscale modeling that includes transport of radiatively active to predict evolution local storm monitored by OMEGA on board Mars Express. We show this governed deep convective motions. The supply energy provided absorption incoming sunlight particles, rather than latent heating as moist convection Earth. propose terminology “rocket storm,” or...
Abstract Observations evidence extremely stable boundary layers (SBL) over the Antarctic Plateau and sharp regime transitions between weakly very conditions. Representing such features is a challenge for climate models. This study assesses modeling of dynamics layer in LMDZ general circulation model. It uses 1 year simulations with stretched‐grid Dome C. The model nudged reanalyses outside C region as can be directly compared to situ observations. We underline critical role downward longwave...
The Martian polar night distribution of 1.27 μ m (0–0) band emission from O 2 singlet delta [O ( 1 Δ g )] is determined an extensive set Mars Reconnaissance Orbiter (MRO) Compact Imaging Spectral Mapping (CRISM) limb scans observed over a wide range seasons, high latitudes, local times, and longitudes between 2009 2011. This nightglow reflects meridional transport winter descent atomic oxygen produced CO photodissociation. A distinct peak in appears prominently 70–90NS latitudes at 40–60 km...
Mapping of the aphelion clouds over Tharsis plateau and retrieval their particle size visible opacity are made possible by OMEGA imaging spectrometer aboard Mars Express. Observations cover period from MY26 L s = 330° to MY29 180° acquired at various local times, ranging 8 AM 6 PM. Cloud maps region constructed using 3.1 μ m ice absorption band reveal seasonal diurnal evolution clouds. Four distinct types identified: morning hazes , topographically controlled cumulus thick hazes. The...
Abstract. Supersaturation often occurs at the top of troposphere where cirrus clouds form, but is comparatively unusual near surface air generally warmer and laden with liquid and/or ice condensation nuclei. One exception high Antarctic Plateau. year atmospheric moisture measurement Dome C on East Plateau presented. The measurements are obtained using commercial hygrometry sensors modified to allow sampling without affecting content, even in case supersaturation. found be very frequent....
Abstract. Long-term, continuous in situ observations of the near-surface atmospheric boundary layer are critical for many weather and climate applications. Although there is a proliferation surface stations globally, especially around populous areas, notably fewer tall meteorological towers with multiple instrumented levels. This particularly true remote extreme environments such as East Antarctic plateau. In article, we present analyze 10 years data from six levels instrumentation mounted...