A5068330082- Planetary Science and Exploration
- Space Exploration and Technology
- Astro and Planetary Science
- Space Science and Extraterrestrial Life
- Spaceflight effects on biology
- Solar and Space Plasma Dynamics
- Space exploration and regulation
- Geophysics and Gravity Measurements
- Spacecraft Design and Technology
- Scientific Research and Discoveries
- Fluid Dynamics and Turbulent Flows
- Geomagnetism and Paleomagnetism Studies
- Atmospheric and Environmental Gas Dynamics
- Fluid Dynamics and Vibration Analysis
- Aeolian processes and effects
- Spacecraft and Cryogenic Technologies
- Ionosphere and magnetosphere dynamics
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Gas Dynamics and Kinetic Theory
- Meteorological Phenomena and Simulations
- Atmospheric chemistry and aerosols
- Wind and Air Flow Studies
- Climate variability and models
- Aerodynamics and Fluid Dynamics Research
Sorbonne Université
2012-2024
Laboratoire de Météorologie Dynamique
2012-2024
Space Science Institute
2014-2024
Université Paris Cité
2008-2024
Centre National de la Recherche Scientifique
2008-2024
Institut National de l'Énergie Solaire
2022-2024
École Polytechnique
2018-2022
École Normale Supérieure - PSL
2019-2022
Université Paris Sciences et Lettres
2010-2022
University of Oxford
2004-2021
We have reconstructed longitude-latitude maps of column dust optical depth (CDOD) for Martian year (MY) 34 (May 5, 2017 --- March 23, 2019) using observations by the Mars Climate Sounder (MCS) aboard NASA's Reconnaissance Orbiter spacecraft. Our methodology works gridding standard and newly available estimates CDOD from MCS limb observations, "iterative weighted binning" methodology. In this work, we reconstruct four gridded per sol, at different Universal Times. Together with seasonal...
General introductionThe Mars Climate Database (MCD) is a database of meteorological fields derived from Circulation Model (GCM) numerical simulations the Martian atmosphere using Planetary (PCM) and validated available observational data. The MCD includes complementary post-processing schemes such as high spatial resolution interpolation environmental data means reconstructing variability thereof [1].The latest version MCD, 6.1, was released in December 2022. The PCM (formerly known...
[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,...
Large-scale planetary waves are diagnosed from an analysis of profiles retrieved the Thermal Emission Spectrometer aboard Mars Global Surveyor spacecraft during its scientific mapping phase. The is conducted by assimilating thermal and total dust opacity retrievals into a global circulation model. Transient largest throughout northern hemisphere autumn, winter spring period almost absent summer. southern exhibits generally weaker transient wave behaviour. A striking feature low-altitude in...
The Reanalysis derived from the UK Mars general circulation model assimilation of Thermal Emission Spectrometer temperature and dust opacity retrievals at present provides best estimate evolving state Martian atmosphere over course Global Surveyor mapping mission. A Control simulation has also been carried out using same distribution as Reanalysis, but without assimilation. Differences in zonal mean temperatures between these two simulations reflect possible biases representation dynamical...
Using a ground-to-exosphere general circulation model for Mars we have simulated the variability of dayside temperatures at exobase during eight Martian years (MY, from MY24 to MY31, approximately 1998 2013), taking into account observed day-to-day solar and dust load variability. We show that are in good agreement with exospheric derived Precise Orbit Determination Global Surveyor. then study effects two planetary-encircling storms on temperatures. The seasonal effect produced by large...
The Mars Analysis Correction Data Assimilation ( MACDA ) dataset version 1.0 contains the reanalysis of fundamental atmospheric and surface variables for planet covering a period about three Martian years (a year is 1.88 terrestrial years). This has been produced by data assimilation observations from NASA 's Global Surveyor MGS spacecraft during its science mapping phase (February 1999–August 2004). In particular, we have used retrieved thermal profiles total dust optical depths Thermal...
Abstract We report observations by the Mars Climate Sounder showing strong diurnal variations in temperature and vertical dust distribution during 2018 (Mars Year 34) global event. The field shows weak tidal activity at equatorial latitudes but a tide middle to high with maximum amplitude of 29 K lower atmosphere south polar region. variability is small region increases toward higher latitudes. At low latitudes, comparable amounts are found about 5–10 km on dayside than nightside. reaches...
<p class="western" lang="en-US" align="justify"><strong>Introduction:</strong></p> align="justify">The Mars Climate Database (MCD) is a database of meteorological fields derived from General Circulation Model (GCM) numerical simulations the Martian atmosphere and validated using available observational data. The MCD includes complementary post-processing...
Polar vortices on Mars provide case-studies to aid understanding of geophysical vortex dynamics and may help resolve long-standing issues regarding polar Earth. Due the recent development first publicly available Martian reanalysis dataset (MACDA), for time we are able characterise thoroughly structure evolution vortices, hence perform a systematic comparison with The winter atmospheric circulations two planets compared, specific focus vortices. residual meridional overturning circulation is...
Light atmospheric species such as helium (He) serve tracers of global circulation in Mars' upper atmosphere (>100 km). Due to its low mass and large scale-height, He exhibits unique behaviour, including the formation bulges, their spatiotemporal variations, response Global Dust Storm (GDS). The significant variability observed during nominal dust conditions (i.e., absence a GDS) highlights helium's sensitivity across different locations seasons on Mars. In recent years, seminal studies...
Abstract The structure and evolution of the Martian polar vortices is examined using two recently available reanalysis systems: version 1.0 Mars Analysis Correction Data Assimilation (MACDA) a preliminary Ensemble Atmosphere Reanalysis System (EMARS). There quantitative agreement between reanalyses in lower atmosphere, where Global Surveyor (MGS) Thermal Emission Spectrometer (TES) data are assimilated, but there differences at higher altitudes reflecting free‐running general circulation...
Abstract Mars regional and global dust storms are able to impact the lower/upper atmospheres through aerosol radiative heating cooling atmospheric circulation. Here we present first attempt globally investigate how transfers from neutral upper atmosphere ionosphere induced magnetosphere above 100‐km altitude. This is achieved by running a multifluid magnetohydrodynamic model under nondusty dusty conditions for 2017 late‐winter storm 1971–1972 storm. Our results show that dayside main...
Previous observations have shown that, during Martian dust storms, the peak of ionosphere rises in altitude. Observational studies this type, however, been extremely limited. Using 13 years ionospheric altitude data from Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) instrument on Express, we study how responded to storms six different Years (MY). The increased $\sim$10-15 km all events, which include a local storm (MY 33), three regional (MYs 27, 29, 32), two global 28...
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...
Hydrogen chloride was discovered in the atmosphere of Mars for first time during global dust storm year (MY) 34 (July 2018) using Atmospheric Chemistry Suite mid-infrared channel (ACS MIR) on ExoMars Trace Gas Orbiter. The simultaneity variations and HCl, a correlation between water vapour led to proposal novel surface-atmosphere coupling analogous terrestrial HCl production troposphere from salt aerosols. After seasonal activity restarted MY 35 (August 2020), we have been monitoring...
The mapping IR channel of the Visual and Infrared Thermal Imaging Spectrometer (VIRTIS‐M) on board Venus Express spacecraft observes CO 2 band at 4.3 μ m a spectral resolution adequate to retrieve atmospheric temperature profiles in 65–96 km altitude range. Observations acquired period June 2006 July 2008 were used derive average fields as function latitude, subsolar longitude (i.e., local time, LT), pressure. Coverage presented here is limited nighttime because adverse effects daytime...
The climate on Earth is generally determined by the amount and distribution of incoming solar radiation, which must be balanced in equilibrium emission thermal radiation from surface atmosphere. precise routes energy transferred within atmosphere back out to space, however, are important features that characterize current climate. This has been analyzed past several groups over years, based combinations numerical model simulations direct observations Earth's system. results often presented...
Abstract We present and discuss here the average fields of Venus atmosphere derived from nighttime observations in 1960–2350 cm −1 spectral range by VIRTIS‐M instrument on board Express satellite. These include: (a) air temperatures 1–100 mbar pressure (~85–65 km above surface), (b) altitude clouds top, (c) CO mixing ratio. A new retrieval code based Bayesian formalism has been developed validated simulated observations, to statistically assess capabilities scheme once applied VIRTIS data....