Understanding the co-evolution of complex life with Earth’s geology is an enduring challenge. The rock record evidences remarkable correlations between changes in biology and the wider Earth system, yet cause […]
Atmospheres, Climate, Weather
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Inferring Atmospheric Properties of Exoplanets with Flow Matching and Neural Importance Sampling
Atmospheric retrievals (AR) characterize exoplanets by estimating atmospheric parameters from observed light spectra, typically by framing the task as a Bayesian inference problem. However, traditional approaches such as nested sampling […]
Posted inAnalog Studies, Arctic / Antarctic / Alpine, Atmospheres, Climate, Weather, Away Teams & Field Reports, Biogeochemical Cycles & Geobiology, Cryobiology, Exploration Gear & Tech, Icy Worlds, Press Release
Ice World Surveys: Laser-based Ice-core Sampling For Studying Climate Change
Editor’s note: as we prepare to visit ice-covered ocean worlds such as Europa and Enceladus – and one day to actually drill beneath their outer surface – we’re certainly going […]
Posted inAtmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Gaia - Planetary Perspectives, Press Release, Terraforming & Geoengineering, Venus
Turning Earth Into Venus: A Stochastic Model of Possible Evolutions of Terrestrial Topography
Venus may have had both an Earth-like climate as well as extensive water oceans and active (or incipient) plate tectonics for an extended interval of its history. The topographical power […]
![An illustration of the anticorrelation between the HCl abundance and water ice from a single observation (Panels A, B, and C) and from all “HCl in ice-holes'' cases (Panel D). Panel A. The aerosol extinction profiles at 3.09-3.46 μm (water ice band, yellow and red) and 0.76-1.6 μm (aerosol continuum, green and blue) measured by MIR and NIR, respectively. Panel B: Retrieved aerosol mass loading profiles of dust (red) and water ice (blue), bottom axes; temperature profile with uncertainties retrieved from NIR data (Fedorova et al., 2023), orange area and top axes. Panel C: volume mixing ratio of HCl (black lines and bottom axes) and H2O (blue lines and top axes) retrieved from MIR and NIR, respectively. Panel D: profiles of HCl VMR (black lines) and aerosol extinction at 3.1 μm (blue lines) normalized to [0, 1] and shifted to align all HCl maxima at 45 km; mean profiles are shown in bold. Error bars of the experimental data correspond to 1−σ uncertainty level. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2023/12/AnEvidenceOf.png?resize=1200%2C719&ssl=1)
Posted inAstrochemistry, Astrogeology, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Mars, Status Report
An Evidence Of Rapid Hydrogen Chloride Uptake On Water Ice In The Atmosphere Of Mars
In 2020, hydrogen chloride (HCl) in the gas phase was discovered in the atmosphere of Mars with the Atmospheric Chemistry Suite (ACS) onboard the Trace Gas Orbiter (TGO) mission (Korablev […]
Posted inAtmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Status Report
Spin and Orbital Dynamics Of Planets Undergoing Thermal Atmospheric Tides Using A Vectorial Approach
Earth-mass planets are expected to have atmospheres and experience thermal tides raised by the host star.
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Mars, Status Report, Titan, Venus
Dynamics And Clouds In Planetary Atmospheres From Telescopic Observations
This review presents an insight into our current knowledge of the atmospheres of the planets Venus, Mars, Jupiter, Saturn, Uranus and Neptune, the satellite Titan, and those of exoplanets.
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems V: Do Self-Consistent Atmospheric Models Represent JWST Spectra? A Showcase With VHS 1256 b
The unprecedented medium-resolution (R=1500-3500) near- and mid-infrared (1-18um) spectrum provided by JWST for the young (120-160Myr) low-mass (12-20MJup) L-T transition (L7) companion VHS1256b has opened new avenues for the in-depth […]
Posted inAstrochemistry, Atmospheres, Climate, Weather, Brown Dwarfs, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
The Carbon-to-Oxygen Ratio in Cool Brown Dwarfs and Giant Exoplanets. I. The Benchmark Late-T dwarfs GJ 570D, HD 3651B and Ross 458C
Measurements of the C/O ratio in brown dwarfs are lacking, in part due to past models adopting solar C/O only. We have expanded the ATMO 2020 atmosphere model grid to […]
Posted inArctic / Antarctic / Alpine, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Icy Worlds, Status Report
The Largely Linear Response Of Earth’s Ice Volume To Orbital Forcing
Orbital forcing plays a key role in pacing the glacial-interglacial cycles. However, the mechanistic linkages between the orbital parameters – eccentricity, obliquity, and precession – and global ice volume remain […]