A5044841682- Astro and Planetary Science
- Planetary Science and Exploration
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- Space Exploration and Technology
- Isotope Analysis in Ecology
- Geology and Paleoclimatology Research
- Space exploration and regulation
- Stellar, planetary, and galactic studies
- Atmospheric and Environmental Gas Dynamics
- Spacecraft and Cryogenic Technologies
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Methane Hydrates and Related Phenomena
- Astrophysics and Star Formation Studies
- Meteorological Phenomena and Simulations
- Geomagnetism and Paleomagnetism Studies
- Ionosphere and magnetosphere dynamics
Laboratoire de Météorologie Dynamique
2019-2024
École Polytechnique
2019-2024
Centre National de la Recherche Scientifique
2015-2024
École Normale Supérieure - PSL
2019-2024
Sorbonne Université
2019-2024
Université Paris Sciences et Lettres
2019-2024
University of Leicester
2020-2022
Université Paris-Saclay
2019
Institut Pierre-Simon Laplace
2015
Abstract Observations of Titan through Cassini’s mission allowed Saturn’s moon’s stratospheric thermal structure and composition to be mapped over half a year. Seasonal variations revealed various unexplained phenomena, such as mechanisms within the polar vortex, evolution at high latitudes, impact enrichment in trace compounds during winter nights. We have developed Planetary Climate Model (Titan PCM)—an improved version IPSL Global (GCM)—including upgraded radiative transfer, now based on...
Abstract Observations of Titan have long revealed the presence seasonal cycles, including haze, clouds, and gases. The lack information on different processes that govern these cycles prevents us from understanding all phenomena taking place in Titan’s atmosphere. In this work, we survey exhaustively to understand their mechanisms, particular haze cloud a large part climate its surface. Planetary Climate Model (Titan PCM)—an upgraded version IPSL Global Model—incorporates microphysical model...
Abstract A detailed one‐dimensional analysis of the energy balance in Venus atmosphere is proposed this work, based on Net Exchange Rate formalism that allows identification each altitude region dominant exchanges controlling temperature. Well‐known parameters control temperature profile are solar flux deposition and cloud particle distribution. Balance between heating infrared analyzed for region: upper (from top to 100 km), cloud, middle base, deep (cloud base surface). The accumulated...
We present a study of the seasonal evolution Titan’s thermal field and distributions haze, C 2 H , 4 6 CH 3 H, 8 HCN, HC N from March 2015 ( L s = 66°) to September 2017 93°) (i.e., last third northern spring early summer). analyzed emission atmosphere acquired by Cassini Composite Infrared Spectrometer with limb nadir geometry retrieve stratospheric mesospheric temperature mixing ratios pole-to-pole meridional cross sections 5 mbar 50 μ bar (120–650 km). The southern stratopause varied in...
We have developed a new version of the IPSL Titan GCM, now called Planetary Climate Model (Titan PCM), including microphysical model for haze and clouds. Observations long revealed presence seasonal cycles on (haze, clouds, organic compounds), ins outs which are still poorly understood. In particular, lack information different flows that govern these prevents us from understanding all phenomena taking place in Titan’s atmosphere. The need to develop complete climate model,...
Amongst the numerous achievements of Cassini-Huygens mission, exploration Titan environment has had an unprecedented impact on knowledge this planet-like satellite Saturn. The next milestone is Dragonfly mission selected for a launch in 2026 and arrival 2034 (Turtle et al. LPSC abstract 2019).Now moment to bridge gap between end measurements preparation operations by prospecting work needed take Titan’s science level prior DragonFly’s future discoveries. Those first...
We present a study of the seasonal evolution Titan’s thermal field and distributions haze, C2H2, C2H4, C2H6, CH3C2H, C3H8, C4H2, C6H6, HCN HC3N from March 2015 (Ls = 66°) to September 2017 93°), i.e. last third northern spring early summer. analyzed emission atmosphere acquired by Cassini Composite Infrared Spectrometer (CIRS) with limb nadir geometry retrieve stratospheric mesospheric temperature mixing ratios pole-to-pole meridional cross sections 5 mbar 50...
Above the dynamic clouds in Neptune’s atmosphere, temperatures and photochemical composition within stratosphere are expected to respond slowly modulating insolation over decades [1].  With seasons stretching more than forty years, entire history of reliable infrared observations resolving planet’s disk comprises a mere fraction season. Yet, as we shall show, this relatively brief window, appear show changes emission that would imply sub-seasonal processes...
ContextOne-dimensional modelling efforts for icy giant atmospheres have been performed in the past, from pioneering works to more recent comprehensive studies [2]. Circulation patterns troposphere and stratosphere inferred visible, infrared, microwave observations models discussed [3], but few fully three-dimensional of Ice Giants ever presented.Among differences between these are estimated radiative time constants consequences atmospheric circulation on Uranus Neptune.  For...
Uranus and Neptune’s atmospheres are active worlds, with vigorous meteorological activity strong zonal winds occurring despite small absorbed solar radiation internal heat fluxes. A few 3-D General Circulation Models (GCM) of their exist in the literature, focusing mostly on understanding jet structure [1,2] or evolution large disturbances [3,4].Building a complete realistic GCM is challenging task, given long orbital radiative timescales involved, along rather high spatial...
<p>Uranus and Neptune have a tropopause, stratosphere thermosphere inexplicably too hot. This problem is called "Energy Crisis" [1,2]. Radio occultation measurements [3,4] UV stellar solar [5,6] by Voyager 2 revealed that their reach values of 150 K 800 K. Globally-averaged temperature observations [7,8] also shown warmer than expected. Current radiative equilibrium models can’t explain the observed temperatures [9,10], one or several unknown...