Temporal variations in spectral reflectivity and vertical cloud structure of Jupiter’s Great Red Spot and its surroundings
(2022)
Abstract:
New Constraints on Titan’s Stratospheric n-Butane Abundance
The Planetary Science Journal American Astronomical Society 3:3 (2022) 59-59
Abstract:
Hazy blue worlds: A holistic aerosol model for Uranus and Neptune, including Dark Spots
(2022)
Isotopic composition of CO2 in the atmosphere of Mars: Fractionation by diffusive separation observed by the ExoMars Trace Gas Orbiter
Journal of Geophysical Research: Planets American Geophysical Union 126:12 (2021) e2021JE006992
Abstract:
Isotopic ratios in atmospheric CO2 are shaped by various processes throughout Mars' history, and can help understand what the atmosphere of early Mars was like to sustain liquid water on its surface. In this study, we monitor the O and C isotopic composition of CO2 between 70 and 130 km for more than half a Martian year using solar occultation observations by the Atmospheric Chemistry Suite onboard the ExoMars Trace Gas Orbiter. We find the vertical trends of the isotopic ratios to be consistent with the expectations from diffusive separation above the homopause, with average values below this altitude being consistent with Earth-like fractionation (δ13C = −3 ± 37‰; δ18O = −29 ± 38‰; and δ17O = −11 ± 41‰). Using these measurements, we estimate that at least 20%–40% of primordial C on Mars has escaped to space throughout history. The total amount of C lost from the atmosphere is likely to be well in excess of this lower limit, due to carbonate formation and further sink processes. In addition, we propose a photochemical transfer of light O from H2O to CO2 to explain the larger enrichment in the 18O/16O ratio in H2O than in CO2.Vertical distribution of aerosols and hazes over Jupiter's great red spot and its surroundings in 2016 from HST/WFC3 imaging
Journal of Geophysical Research: Planets American Geophysical Union 126:11 (2021) e2021JE006996