Search Publications
An investigation into Venusian atmospheric chemistry based on an open-access photochemistry-transport model at 0–112 km
Sheng, Zheng; Dai, Longkang; Shao, Wencheng
Atmospheric chemistry plays a crucial role in the evolution of climate habitability on Venus. It has been widely explored by chemistry-transport models, but some characteristics are still poorly interpreted. This study is devoted to developing an open-access chemistry-transport model spanning both the middle and lower atmospheres of Venus. It prov…
One-dimensional Microphysics Model of Venusian Clouds from 40 to 100 km: Impact of the Middle-atmosphere Eddy Transport and SOIR Temperature Profile on the Cloud Structure
Vandaele, Ann Carine; Terada, Naoki; Imamura, Takeshi +4 more
We conducted a simulation of H2SO4 vapor, H2O vapor, and H2SO4–H2O liquid aerosols from 40 to 100 km, using a 1D Venus cloud microphysics model based on the one detailed in Imamura & Hashimoto. The cloud distribution obtained is in good agreement with in situ observations by Pio…
Atmospheric gravity waves in Venus dayside clouds from VIRTIS-M images
Cardesín-Moinelo, Alejandro; Hueso, Ricardo; Peralta, Javier +3 more
We perform a survey of the Visible and Infrared Thermal Imaging Spectrometer-Mapper (VIRTIS-M) images onboard the Venus Express space mission, at four narrow wavelength bands that target different altitude regions on the cloud deck of Venus' atmosphere (280–320, 365–400, 580–600, 900–920 nm). Our goal was to detect and characterize atmospheric gra…
Bimodal aerosol distribution in Venus' upper haze from joint SPICAV-UV and -IR observations on Venus Express
Montmessin, F.; Fedorova, A.; Korablev, O. +3 more
Spectroscopic solar occultation measurements by the Spectroscopy for Investigation of Characteristics of the Atmosphere of Venus/Solar Occultation at Infrared instrument (SPICAV/SOIR) onboard the Venus Express orbiter gave new data about upper haze aerosol properties, its vertical distribution and spatial and temporal variations. Early study with …
Do Solar Energetic Particle (SEP) Events Influence the Formation of the V0 Layer in the Venusian Ionosphere?
Choudhary, R. K.; Imamura, T.; Sánchez-Cano, Beatriz +2 more
This study investigates the potential impact of Solar Energetic Particles (SEPs) on the V0 layer of the Venus ionosphere. Electron density profiles obtained from radio occultation experiments conducted by the Venus Express (VEX) and Akatsuki missions were utilized for this purpose. Background data from the Analyzer of Space Plasma and E…
The Venus Global Ionosphere-Thermosphere Model (V-GITM): A Coupled Thermosphere and Ionosphere Formulation
Bougher, Stephen W.; Ridley, Aaron J.; Ponder, Brandon M. +2 more
This paper introduces the new Venus global ionosphere-thermosphere model (V-GITM) which incorporates the terrestrial GITM framework with Venus-specific parameters, ion-neutral chemistry, and radiative processes in order to simulate some of the observable features regarding the temperatures, composition, and dynamical structure of the Venus atmosph…
Unexpected increase of the deuterium to hydrogen ratio in the Venus mesosphere
Vandaele, Ann Carine; Robert, Séverine; Chamberlain, Sarah +14 more
Studying Venus's HDO and H2O sheds light on its water history. The HDO/H2O ratio in its bulk atmosphere, 120 times Earth's, suggests a significantly wetter past for Venus. Our study analyzes mesospheric (70 to 110 km) temperature, H2O, and HDO profiles taken in solar occultation by SOIR/Venus Express. We observe in…
Three-Dimensional Venus Cloud Structure Simulated by a General Circulation Model
Shao, Wencheng D.; Dai, Longkang; Mendonça, João. M.
The clouds have a great impact on Venus's energy budget and climate evolution, but its three-dimensional structure is still not well understood. Here we incorporate a simple Venus cloud physics scheme into a flexible GCM to investigate the three-dimensional cloud spatial variability. Our simulations show good agreement with observations in terms o…
Exploring sensitivity: Unveiling the impact of input parameters on Venus ionosphere V2 layer characteristics
Choudhary, R. K.; Ambili, K. M.; Tripathi, Keshav R.
This study investigates the impact of model input parameters on the characteristic features of the dayside V2 layer in the Venus ionosphere using an in-house developed one-dimensional photochemical model (1D-PCM) and observations from Venus Express radio science experiments (VeRa). 1D-PCM is simulated for different combinations of neutr…
H2CO, O3, NH3, HCN, N2O, NO2, NO, and HO2 upper limits of detection in the Venus lower-mesosphere using SOIR on board Venus Express
Aoki, S.; Vandaele, A. C.; Trompet, L. +6 more
We report on mean upper limit number densities and volume concentrations of H2CO, O3, NH3, HCN, N2O, NO2, NO, and HO2 at the Venus terminator above the cloud layer, computed from the SOIR/Venus Express transmittances measured during hundreds of solar occultations. An unsuccessful at…