Search Results - "Zent, A."

Mars Water-Ice Clouds and Precipitation by Whiteway, J.A, Komguem, L, Dickinson, C, Cook, C, Illnicki, M, Seabrook, J, Popovici, V, Duck, T.J, Davy, R, Taylor, P.A, Pathak, J, Fisher, D, Carswell, A.I, Daly, M, Hipkin, V, Zent, A.P, Hecht, M.H, Wood, S.E, Tamppari, L.K, Renno, N, Moores, J.E, Lemmon, M.T, Daerden, F, Smith, P.H

“…The light detection and ranging instrument on the Phoenix mission observed water-ice clouds in the atmosphere of Mars that were similar to cirrus clouds on…”
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A historical search for habitable ice at the Phoenix landing site by Zent, Aaron

“…A time-resolved energy balance model in the latitude range targeted by Phoenix, and extending back in time over the past 10 Ma, has been developed and used to…”
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Hydroxyl (OH) production on airless planetary bodies: Evidence from H+/D+ ion-beam experiments by Ichimura, A.S., Zent, A.P., Quinn, R.C., Sanchez, M.R., Taylor, L.A.

“…The hypothesis that bombardment of lunar soil with solar-wind protons might form hydroxyl (OH) and perhaps HOH has been tested by experiments with Apollo 16…”
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Relative Humidity on Mars: New Results From the Phoenix TECP Sensor by Fischer, E., Martínez, G. M., Rennó, N. O., Tamppari, L. K., Zent, A. P.

“…In situ measurements of relative humidity (RH) on Mars have only been performed by the Phoenix (PHX) and Mars Science Laboratory (MSL) missions. Here we…”
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Introduction to special section on the Phoenix Mission: Landing Site Characterization Experiments, Mission Overviews, and Expected Science by Smith, P. H., Tamppari, L., Arvidson, R. E., Bass, D., Blaney, D., Boynton, W., Carswell, A., Catling, D., Clark, B., Duck, T., DeJong, E., Fisher, D., Goetz, W., Gunnlaugsson, P., Hecht, M., Hipkin, V., Hoffman, J., Hviid, S., Keller, H., Kounaves, S., Lange, C. F., Lemmon, M., Madsen, M., Malin, M., Markiewicz, W., Marshall, J., McKay, C., Mellon, M., Michelangeli, D., Ming, D., Morris, R., Renno, N., Pike, W. T., Staufer, U., Stoker, C., Taylor, P., Whiteway, J., Young, S., Zent, A.

“…Phoenix, the first Mars Scout mission, capitalizes on the large NASA investments in the Mars Polar Lander and the Mars Surveyor 2001 missions. On 4 August…”
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A revised calibration function and results for the Phoenix mission TECP relative humidity sensor by Zent, A. P., Hecht, M. H., Hudson, T. L., Wood, S. E., Chevrier, V. F.

“…A new calibration function for the humidity sensor in the Thermal and Electrical Conductivity Probe (TECP) on the Phoenix (PHX) Mars mission has been…”
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In situ analysis of ice table depth variations in the vicinity of small rocks at the Phoenix landing site by Sizemore, H. G., Mellon, M. T., Searls, M. L., Lemmon, M. T., Zent, A. P., Heet, T. L., Arvidson, R. E., Blaney, D. L., Keller, H. U.

“…Prior to the Phoenix mission, ice stability simulations predicted that surface rocks at the landing site would produce depressions in the ice table (the…”
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Decomposition of aqueous organic compounds in the Atacama Desert and in Martian soils by Quinn, R. C., Ehrenfreund, P., Grunthaner, F. J., Taylor, C. L., Zent, A. P.

“…Carbon‐13 labeled formate, alanine, and glucose decompose when added in aqueous solution to soils collected from the “Mars‐like” Yungay region (S 24° 4′ 9.6″,…”
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Detection and characterization of oxidizing acids in the Atacama Desert using the Mars Oxidation Instrument by Quinn, R.C., Zent, A.P., Grunthaner, F.J., Ehrenfreund, P., Taylor, C.L., Garry, J.R.C.

“…We have performed field experiments to further develop and validate the Mars Oxidation Instrument (MOI) as well as measurement strategies for the in situ…”
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On the thickness of the oxidized layer of the Martian regolith by Zent, Aaron P.

“…A revised model of the diffusion of H2O2 through the Martian regolith is presented, which argues that oxidant diffusion may be more efficient than previously…”
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Urey: Mars Organic and Oxidant Detector by Bada, J. L., Ehrenfreund, P., Grunthaner, F., Blaney, D., Coleman, M., Farrington, A., Yen, A., Mathies, R., Amudson, R., Quinn, R., Zent, A., Ride, S., Barron, L., Botta, O., Clark, B., Glavin, D., Hofmann, B., Josset, J. L., Rettberg, P., Robert, F., Sephton, M.

“…One of the fundamental challenges facing the scientific community as we enter this new century of Mars research is to understand, in a rigorous manner, the…”
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Peroxide-modified titanium dioxide: a chemical analog of putative Martian soil oxidants by Quinn, R. C., Zent, A. P.

“…Hydrogen peroxide chemisorbed on titanium dioxide (peroxide-modified titanium dioxide) is investigated as a chemical analog to the putative soil oxidants…”
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A model for formation of dust, soil, and rock coatings on Mars: Physical and chemical processes on the Martian surface by Bishop, Janice L., Murchie, Scott L., Pieters, Carlé M., Zent, Aaron P.

“…A model is presented here to explain the generation of surface material on Mars using chemical, magnetic, and spectroscopic data from Mars and geologic analogs…”
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The Beagle 2 environmental sensors: science goals and instrument description by Towner, M.C., Patel, M.R., Ringrose, T.J., Zarnecki, J.C., Pullan, D., Sims, M.R., Haapanala, S., Harri, A.-M., Polkko, J., Wilson, C.F., Zent, A.P., Quinn, R.C., Grunthaner, F.J., Hecht, M.H., Garry, J.R.C.

“…A suite of instruments on the Beagle 2 Mars lander was designed and built in order to investigate the environmental conditions at the landing site. The sensor…”
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A coupled soil-atmosphere model of H2O2 on Mars by Bullock, M A, Stoker, C R, McKay, C P, Zent, A P

“…The Viking Gas Chromatograph Mass Spectrometer failed to detect organic compounds on Mars, and both the Viking Labeled Release and the Viking Gas Exchange…”
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Mars atmospheric oxidant sensor (MAOS): an in-situ heterogeneous chemistry analysis by Zent, A.P., Quinn, R.C., Grunthaner, F.J., Hecht, M.H., Buehler, M.G., McKay, C.P., Ricco, A.J.

“…We describe a chemometric array sensor, the Mars atmospheric oxidant sensor (MAOS, pronounced “mouse”) that is designed to measure the oxidation rate of thin…”
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Nomad Rover Field Experiment, Atacama Desert, Chile: 1. Science results overview by Cabrol, N. A., Chong‐Diaz, G., Stoker, C. R., Gulick, V. C., Landheim, R., Lee, P., Roush, T. L., Zent, A. P., Lameli, C. Herrera, Iglesia, A. Jensen, Arrerondo, M. Pereira, Dohm, J. M., Keaten, R., Wettergreen, D., Sims, M. H., Schwher, K., Bualat, M. G., Thomas, H. J., Zbinden, E., Christian, D., Pedersen, L., Bettis, A., Thomas, G., Witzke, B.

“…Nomad was deployed for a 45 day traverse in the Atacama Desert, Chile, during the summer of 1997. During this traverse, 1 week was devoted to science…”
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Humidity observations and column simulations for a warm period at the Mars Phoenix lander site: Constraining the adsorptive properties of regolith by Savijärvi, H.I., Martinez, G.M., Fischer, E., Renno, N.O., Tamppari, L.K., Zent, A., Harri, A.-M.

“…Two recalibrated sets of Phoenix (PHX) near-surface TECP air humidity measurements were compared with results from adsorptive single column model simulations…”
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Measurement of H2O adsorption under Mars-like conditions: Effects of adsorbent heterogeneity by Zent, A. P., Quinn, R. C.

“…New measurements of the adsorption of H2O onto terrestrial materials, under Mars‐like conditions, disagree with predictions made on the basis of the most…”
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Planning for a Mars in situ sample preparation and distribution (SPAD) system by Beaty, D.W, Miller, S, Zimmerman, W, Bada, J, Conrad, P, Dupuis, E, Huntsberger, T, Ivlev, R, Kim, S.S, Lee, B.G, Lindstrom, D, Lorenzoni, L, Mahaffy, P, McNamara, K, Papanastassiou, D, Patrick, S, Peters, S, Rohatgi, N, Simmonds, J.J, Spray, J, Swindle, T.D, Tamppari, L, Treiman, A, Wolfenbarger, J.K, Zent, A

“…For Mars in situ landed missions, it has become increasingly apparent that significant value may be provided by a shared system that we call a Sample…”
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