A5057531878- Planetary Science and Exploration
- Astro and Planetary Science
- Space Exploration and Technology
- Geology and Paleoclimatology Research
- Space Science and Extraterrestrial Life
- Geochemistry and Geologic Mapping
- Radioactivity and Radon Measurements
- Crustacean biology and ecology
- Spaceflight effects on biology
- Spacecraft and Cryogenic Technologies
- Marine and environmental studies
- Gas Dynamics and Kinetic Theory
- Gamma-ray bursts and supernovae
- Interprofessional Education and Collaboration
- Aeolian processes and effects
- Spectroscopy and Chemometric Analyses
- Knowledge Management and Technology
- Misinformation and Its Impacts
- Value Engineering and Management
- Underwater Acoustics Research
- Cephalopods and Marine Biology
- Health, Environment, Cognitive Aging
- Marine and fisheries research
- Geological and Geochemical Analysis
- Insect and Arachnid Ecology and Behavior
Washington University in St. Louis
2021-2025
Newfoundland and Labrador Centre for Applied Health Research
2008
Harvard University
2000
The geological units on the floor of Jezero crater, Mars, are part a wider regional stratigraphy olivine-rich rocks, which extends well beyond crater. We investigated petrology olivine and carbonate-bearing rocks Séítah formation in Jezero. Using multispectral images x-ray fluorescence data, acquired by Perseverance rover, we performed petrographic analysis Bastide Brac outcrops within this unit. found that these composed igneous rock, moderately altered aqueous fluid. mainly made...
The Jezero crater floor features a suite of related, iron-rich lavas that were examined and sampled by the Mars 2020 rover Perseverance, whose textures, minerals, compositions characterized Planetary Instrument for X-ray Lithochemistry (PIXL). This suite, known as Máaz formation (fm), includes dark-toned basaltic/trachy-basaltic rocks with intergrown pyroxene, plagioclase feldspar, altered olivine overlying trachy-andesitic lava reversely zoned phenocrysts in K-rich groundmass. Feldspar...
Abstract Martian soils are critically important for understanding the history of Mars, past potentially habitable environments, returned samples, and future human exploration. This study examines soil crusts on floor Jezero crater encountered during initial phases Mars 2020 mission. Soil surface have been observed at other locations, starting with two Viking Lander missions. Rover observations show that also common across crater, revealed in 45 101 locations where rover wheels disturbed...
Abstract The Mars Exploration Rovers (MER) Spirit and Opportunity , sent to Gusev crater Meridiani Planum, respectively, determined the chemical composition of martian materials with their Alpha Particle X‐ray Spectrometers (APXS). MER APXS was effective at routinely quantifying major, minor, select (Ni, Zn, Br) trace elements levels down ∼50 ppm but often reached detection limits for other (e.g., Ga Ge during typical individual analyses a single sample). To enable precise quantification...
Gale crater, the field site for NASA's Mars Science Laboratory Curiosity rover, contains a diverse and extensive record of aeolian deposition erosion. This study focuses on series regularly spaced, curvilinear, sometimes branching bedrock ridges that occur within Glen Torridon region lower northwest flank Aeolis Mons, central mound crater. During Curiosity's exploration between sols ∼2300-3080, rover drove through this ridges, providing opportunity in situ observation these features. uses...
Abstract Thermal inertia is a key summary property describing the thermophysical characteristics of geologic materials. Orbital estimates thermal are especially useful in conjunction with rover‐based observations to provide additional constraints on material properties and interpret broader region surrounding traverse. We have developed an approach estimate apparent inertias (ATI) from Mars Reconnaissance Orbiter's Compact Imaging Spectrometer for (CRISM) at much higher spatial resolution...
Abstract Wave modeling and analysis of sedimentary structures were used to evaluate whether four examples symmetrical, reversing, or straight‐crested bedforms in Gale crater sandstones are preserved wave ripples; deposition by waves would demonstrate that the lake was not covered ice at time. indicates regardless atmospheric density, winds exceeded threshold aeolian sand transport could have generated capable producing nearshore ripples most grain sizes sand. Reversing 3‐m‐wavelength...
(2008). ARE SEISMIC SURVEYS AN IMPORTANT RISK FACTOR FOR FISH AND SHELLFISH? Bioacoustics: Vol. 17, No. 1-3, pp. 262-265.
Alpha Particle X-ray Spectrometers (APXS) were an integral component of the science payload that flew on twin Mars Exploration Rovers (MER) Spirit and Opportunity. An updated version MER APXS instrument, further optimized for in situ geochemical analyses Mars, is currently operational within Gale crater onboard Science Laboratory (MSL) rover Curiosity. MSL designed calibrated high-precision geologic materials Mars. The use curium-244 sources provides high sensitivity to lower-Z elements....
<title>Abstract</title> Phosphorus is an essential component for life, and in-situ identification of phosphate minerals that formed in aqueous conditions directly contributes toward one the main goals Mars 2020 Perseverance rover: to seek signs ancient habitable environments. In Jezero crater, proximity science analyses within a conglomerate outcrop, “Onahu” demonstrate presence rare Fe3+-bearing (likely beraunite, metavivianite, ferrolaueite, and/or santabarbaraite) embedded carbonate-rich...
Occurrence of Logperch, Percina caprodes, in tributaries Atikonak Lake
The Alpha Particle X-ray Spectrometer (APXS) onboard the Mars Science Laboratory (MSL) rover Curiosity has acquired approximately 1,300 geochemical analyses since landing in 2012. APXS utilizes a combination of fluorescence and particle-induced emission to determine chemical composition materials within its 15+ mm diameter field view (FOV) [1, 2]. Diagenetic features provide means further understand constrain habitability Curiosity's site, Gale crater. These often present as veins or nodules...