A5067145732- Planetary Science and Exploration
- Astro and Planetary Science
- Space Exploration and Technology
- Space Science and Extraterrestrial Life
- Spaceflight effects on biology
- Geophysics and Gravity Measurements
- Spacecraft Design and Technology
- Scientific Research and Discoveries
- Geology and Paleoclimatology Research
- Stellar, planetary, and galactic studies
- Meteorological Phenomena and Simulations
- Atmospheric Ozone and Climate
- Climate variability and models
- Space exploration and regulation
- Spacecraft and Cryogenic Technologies
- Astronomy and Astrophysical Research
- Gas Dynamics and Kinetic Theory
- Atmospheric and Environmental Gas Dynamics
- Solar and Space Plasma Dynamics
- Technology Assessment and Management
- Engineering and Information Technology
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Ionosphere and magnetosphere dynamics
- Radiative Heat Transfer Studies
McGill University
2020-2024
Space Science Institute
2022-2024
Planetary Science Institute
2018-2021
University of California, Los Angeles
2018-2021
Ames Research Center
2021
University of California System
2020
University of Bern
2020
Laboratoire de Météorologie Dynamique
2013-2019
Centre National de la Recherche Scientifique
2012-2018
École Normale Supérieure - PSL
2017-2018
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,...
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,...
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...
Abstract The origin of the detached dust layers observed by Mars Climate Sounder aboard Reconnaissance Orbiter is still debated. Spiga et al. (2013, https://doi.org/10.1002/jgre.20046 ) revealed that deep mesoscale convective “rocket storms” are likely to play an important role in forming these layers. To investigate how generated this phenomenon and subsequently evolve at larger scales, a parameterization rocket storms represent convection designed included into Laboratoire de Météorologie...
Abstract The impact of gravity waves (GW) on diurnal tides and the global circulation in middle/upper atmosphere Mars is investigated using a general model (GCM). We have implemented stochastic parameterization non‐orographic GW into Laboratoire de Météorologie Dynamique (LMD) GCM (LMD‐MGCM) following an innovative approach. source assumed to be located above typical convective cells ( 250 Pa), effect predicted thermal structure 1 Pa 50 km) analyzed. focus comparison between simulations...
Data assimilation is carried out for the Martian atmosphere with Mars Climate Sounder (MCS) retrievals of temperature, dust, and ice. It performed period Ls = 180° to 320° Year 29 Local Ensemble Transform Kalman Filter scheme Laboratoire de Météorologie Dynamique (LMD) Global Model (GCM). In order deal forcings aerosols (dust water ice) on atmospheric temperatures, a framework given multivariate analysis. consists assimilating GCM variable help another that can be more easily related an...
Abstract Airborne dust modifies the thermal structure of Martian atmosphere. The Mars Climate Sounder (MCS) first revealed local maxima mass mixing ratio detached from surface, not reproduced by global climate models (GCM). In this paper, signature such layers is detected using data assimilation, an optimal combination a GCM and observations. As influences atmospheric temperatures, MCS temperature profiles are used to estimate amount in Data assimilation only information reproduces layers,...
Abstract Planetary‐scale mountain waves have been observed at the cloud top of Venus and throughout deck. As they propagate from surface to layers, multiple observations numerical simulations shown that grow in size do not break. However, fate transition region thermosphere, above super‐rotating atmosphere, has only addressed with two‐dimensional models. We conduct for first time a simulation state‐of‐the‐art climate model includes thermosphere. find can up least 150 km altitude, well...
A numerical simulation of the upper atmosphere Venus is carried out with an improved version Institut Pierre-Simon Laplace (IPSL) full-physics General Circulation Model (GCM). This reveals organization atmospheric circulation at altitude above 80 km in unprecedented detail. Converging flow towards antisolar point results supersonic wind speeds and generates a shock-like feature past terminator altitudes 110 km. greatly decreases nightside thermospheric speeds, favoring variability on hourly...
A 2-D spectral full-wave model is described that simulates the generation and propagation of mountain waves over idealized topography in Venus' atmosphere. Modeled temperature perturbations are compared with Akatsuki observations. Lower atmosphere eddy diffusivity stability play a major role upward gravity from their sources. Two local times (LT) considered. For LT = 11 h blocked by critical level near 100 km altitude, while for 16 propagate into thermosphere. As result small scale height...
Abstract Planetary‐scale waves are thought to play a role in powering the yet unexplained atmospheric superrotation of Venus. Puzzlingly, while Kelvin, Rossby, and stationary manifest at upper clouds (65–70 km), no planetary‐scale or patterns have been reported intervening level lower (48–55 although latter probably Lee waves. Using observations by Akatsuki orbiter ground‐based telescopes, we show that follow regular cycle punctuated between 30°N 40°S sharp discontinuity disruption with...