Search Publications
Protracted Hydrogeological Activity in Arabia Terra, Mars: Evidence From the Structure and Mineralogy of the Layered Deposits of Becquerel Crater
Rossi, A. P.; Pondrelli, M.; Schmidt, G. +3 more
The formation of layered mounds on Mars remains a major topic of debate, with the relationship between their deposition and chemical alteration a major aspect still to be constrained. The association these deposits have with hydrated minerals indicates aqueous processes were active in their past, however the extent and duration of this aqueous per…
Thermal Structure and Aerosols in Mars' Atmosphere From TIRVIM/ACS Onboard the ExoMars Trace Gas Orbiter: Validation of the Retrieval Algorithm
Grigoriev, A.; Forget, F.; Montmessin, F. +12 more
The Atmospheric Chemistry Suite (ACS) onboard the ExoMars Trace Gas Orbiter monitors the Martian atmosphere through different spectral intervals in the infrared light. We present a retrieval algorithm tailored to the analysis of spectra acquired in nadir geometry by Thermal InfraRed channel in honor of professor Vassilii Ivanovich Moroz (TIRVIM), …
Orbital Observations of a Marker Horizon at Gale Crater
Arvidson, Raymond E.; Weitz, Catherine M.; Grant, John A. +5 more
A dark-toned, indurated, smooth horizon, and (or) bed (herein called "marker horizon") is exposed across much of the northwestern, southwestern, and southeastern portions of Mount Sharp in Gale crater. Compact Reconnaissance Imaging Spectrometer for Mars spectra taken from the marker horizon exhibit evidence for the presence of high calcium pyroxe…
New Insights Into Subsurface Stratigraphy Northwest of Ascraeus Mons, Mars, Using the SHARAD and MARSIS Radar Sounders
Plaut, J. J.; Carter, L. M.; Morgan, G. A. +2 more
The Tharsis Montes volcanoes on Mars are the source of laterally extensive lava flows and other volcanic deposits generating a complex stratigraphy throughout the Tharsis Volcanic Province. We use SHAllow RADar (SHARAD) and Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) observations in a region northwest of Ascraeus Mons to d…
A Simple Condensation Model for the H2SO4-H2O Gas-Cloud System on Venus
Shao, Wencheng D.; Zhang, Xi; Cui, Jun +2 more
The current Venus climate is largely regulated by globally covered concentrated sulfuric acid clouds from binary condensation of sulfuric acid (H2SO4) and water (H2O). To understand this complicated H2SO4-H2O gas-cloud system, previous theoretical studies either adopted complicated …
Density and Temperature of the Upper Mesosphere and Lower Thermosphere of Mars Retrieved From the OI 557.7 nm Dayglow Measured by TGO/NOMAD
Aoki, S.; Vandaele, A. C.; Daerden, F. +15 more
The upper mesosphere and lower thermosphere of Mars (70-150 km) is of high interest because it is a region affected by climatological/meteorological events in the lower atmosphere and external solar forcing. However, only a few measurements are available at this altitude range. OI 557.7 nm dayglow emission has been detected at these altitudes by t…
Carbon Dioxide Ice Glaciers at the South Pole of Mars
Smith, I. B.; Putzig, N. E.; Schlegel, N. -J. +4 more
Massive, kilometer thick deposits of carbon dioxide (CO2) ice have been detected at the south polar cap of Mars by radar investigations. These deposits are divided into several units that are separated by thin water ice bounding layers. Recent studies investigated the accumulation history of CO2 ice and found that the deposit…
Improved Modeling of Mars' HDO Cycle Using a Mars' Global Climate Model
Montmessin, Franck; Trokhimovskiy, Alexander; Korablev, Oleg +11 more
HDO and the D/H ratio are essential to understand Mars past and present climate, in particular with regard to the evolution through ages of the Martian water cycle. We present here new modeling developments of the HDO cycle with the Laboratoire de Météorologie Dynamique Mars Global Climate Model (GCM). The present study aims at exploring the behav…
Layered Ejecta Craters in the Candidate Landing Areas of China's First Mars Mission (Tianwen-1): Implications for Subsurface Volatile Concentrations
Di, Kaichang; Gou, Sheng; Yue, Zongyu +2 more
One important scientific objective of China's first Mars mission (Tianwen-1) is to investigate the martian surface soil characteristics and water-ice distribution. Layered ejecta craters (LECs) on Mars are characterized by their fluidized ejecta deposits which have been interpreted to indicate volatiles in the substrate where the impact occurred. …
Compositional Measurements of Saturn's Upper Atmosphere and Rings From Cassini INMS: An Extended Analysis of Measurements From Cassini's Grand Finale Orbits
Yelle, R. V.; Hörst, S. M.; Koskinen, T. T. +5 more
The Cassini spacecraft's final orbits sampled Saturn's atmosphere and returned surprisingly complex mass spectra from the Ion and Neutral Mass Spectrometer. Signal returned from the instrument included native Saturn species, as expected, as well as a significant amount of signal attributed to vaporized ices and higher mass organics believed to be …