Search Publications
Development and Evolution of Icy Layer Outcrops on Mars' North Polar Ice Cap: Observations of Vertical and Lateral Variability
Mustard, John F.; Becerra, Patricio; Bramson, Ali M. +1 more
Mars' north polar ice cap features troughs that cut into the ice, exposing subsurface layers of different brightness and topographic expression. Specifically, these layers represent two different stratum types: lower albedo (higher dust content) marker beds, which protrude out of the wall topographically, and higher albedo (i.e., icier) interbeds,…
Global Transport of Chlorine Species in the Martian Atmosphere and the Resulting Surface Distribution of Perchlorates
Patel, M. R.; Korablev, O.; Olsen, K. S. +5 more
Recent observations by instruments aboard the ExoMars Trace Gas Orbiter (TGO) have revealed the seasonal presence of hydrogen chloride ($\text{HCl}$) in the Martian atmosphere. This discovery may have important implications for Martian photochemistry as chlorine species are chemically active, and it may provide a link between the atmosphere and kn…
Shallow Water Ice Detection From SHARAD Data in Central Utopia Planitia, Mars
Bugiolacchi, Roberto; Xu, Xiaoting; Xu, Yi +5 more
One of the key scientific goals of China's first Mars mission Tianwen-1 is to search for ground ice. This study focuses on investigating potential water ice reservoirs in the vicinity of the landing site of the Zhurong rover to provide geological context and references for data interpretation. Our study area is centered on Utopia Planitia (UP), wh…
Aerosol Climatology on Mars as Observed by NOMAD UVIS on ExoMars TGO
Vandaele, A. C.; Daerden, F.; Thomas, I. R. +16 more
The Nadir and Occultation for MArs Discovery spectrometer on board Trace Gas Orbiter began science operations in April 2018, providing infrared and ultraviolet-visible spectra of the Martian atmosphere. This paper explores the application of the UVIS channel in solar occultation to study aerosols. We have developed a retrieval scheme that allows u…
Martian Atmospheric Disturbances From Orbital Images and Surface Pressure at Jezero Crater, Mars, During Martian Year 36
Hueso, R.; Sánchez-Lavega, A.; Toledo, D. +13 more
We present a study of atmospheric disturbances at Jezero Crater, Mars, using ground-based measurements of surface pressure by the Perseverance rover in combination with orbital images from the Mars Express and Mars Reconnaissance Orbiter missions. The study starts at Ls ∼ 13.3° in MY36 (6 March 2021) and extends up to Ls ∼ 30…
Atmospheric Gravity Waves in Mars' Lower Atmosphere: Nadir Observations From OMEGA/Mars Express Data
Gilli, G.; Machado, P.; Wilson, C. +6 more
We present the detection and characterization of mesoscale waves on the lower clouds of Mars (20–40 km) using hyperspectral images from the Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité (OMEGA) onboard the European Mars Express space mission. We used image navigation and processing techniques based on contrast enhancement and g…
Temperature and Composition Disturbances in the Southern Auroral Region of Jupiter Revealed by JWST/MIRI
de Pater, Imke; Wong, Michael H.; Fletcher, Leigh N. +17 more
Jupiter's South Polar Region (SPR) was observed by James Webb Space Telescope/Mid-Infrared Instrument in December 2022. We used the Medium Resolution Spectrometer mode to provide new information about Jupiter's South Polar stratosphere. The southern auroral region was visible and influenced the atmosphere in several ways: (a) In the interior of th…
Measuring Erosional and Depositional Patterns Across Comet 67P's Imhotep Region
Soderblom, J. M.; Hayes, A. G.; Kirk, R. L. +8 more
Comet 67P/Churyumov-Gerasimenko displays a pronounced hemispherical dichotomy in surface morphology, where the southern hemisphere exhibits more erosional features than the northern hemisphere due to receiving much greater solar radiation. Consequently, it is generally assumed that particles are ejected from the southern hemisphere through sublima…
Gravity-Driven Differences in Fluvial Sediment Transport on Mars and Earth
Sefton-Nash, Elliot; Braat, Lisanne; Lamb, Michael P. +1 more
There is abundant evidence from fluvial landforms and deposits that Mars had rivers that actively transported sediment and shaped its surface. Sediment transport equations are playing a key role in quantifying river processes from these observations, which continue to increase in quality and quantity. In this study, we review sediment transport eq…
Climatology and Diurnal Variation of Ozone Column Abundances for 2.5 Mars Years as Measured by the NOMAD-UVIS Spectrometer
Vandaele, A. C.; Daerden, F.; Ristic, B. +14 more
The distribution of Mars ozone (O3) is well established; however, our knowledge on the dayside diurnal variation of O3 is limited. We present measurements of Mars O3 column abundances, spanning Mars Year (MY) 34 to the end of MY 36, by the Ultraviolet and VIsible Spectrometer (UVIS), part of the Nadir and Occultati…