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Water probably flowed across ancient Mars, but whether it ever exists as a liquid on the surface today remains debatable. Recurring slope lineae (RSL) are narrow (0.5 to 5 meters), relatively dark markings on steep (25° to 40°) slopes; repeat images from the Mars Reconnaissance Orbiter High Resolution Imaging Science Experiment show them to appear and(More)
Introduction: Theoretical results [1-7] and observational evidence [8-11] indicate that high-latitude terrain on Mars contains large quantities pore-filling ice buried beneath a desiccated regolith. Although the models themselves differ in detail, they all show a sharp transition from regions where ice is currently stable to those where it is not. The(More)
New impact craters at five sites in the martian mid-latitudes excavated material from depths of decimeters that has a brightness and color indicative of water ice. Near-infrared spectra of the largest example confirm this composition, and repeated imaging showed fading over several months, as expected for sublimating ice. Thermal models of one site show(More)
[1] The Mars Phoenix Lander was equipped with a 2.4 m Robotic Arm (RA) with an Icy Soil Acquisition Device capable of excavating trenches in soil deposits, grooming hard icy soil surfaces with a scraper blade, and acquiring icy soil samples using a rasp tool. A camera capable of imaging the scoop interior and a thermal and electrical conductivity probe were(More)
The DISORT-based model takes the dust and ice aerosol optical depths (scaled to the CRISM wavelength range), the surface pressures (computed from MOLA altimetry, MGS-TES lower atmospheric thermometry, and Viking-based pressure climatology), the surface temperatures, the reconstructed instrumental photo-metric angles, and the measured I/F spectrum as inputs,(More)
Introduction: A critical component to understanding the volatile inventory and climate of Mars is to understand the exchange of CO 2 and H 2 O between the atmosphere and surface. The ability of the seasonal polar caps to trap up to 25% of the atmosphere during the winter months reinforces the important role these condensates play in meteorological processes(More)
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