Mathematics – Logic
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86..503r&link_type=abstract
Journal of Geophysical Research, vol. 86, Jan. 20, 1981, p. 503-511.
Mathematics
Logic
12
Atmospheric Moisture, Frost, Mars Atmosphere, Planetary Meteorology, Atmospheric Temperature, Meteorological Parameters, Plumes, Viking Lander Spacecraft, Mars, Water, Frost, Viking Lander, Meteorology, Wind, Temperature, Pressure, Atmosphere, Hypotheses, Data, Observations, Comparisons, Cooling, Models, Ice, Mixing
Scientific paper
The Viking Mars landers contain meteorological instrumentation to measure wind, temperature, and pressure but not atmospheric water content. The landings occurred during local summer, and it was observed that the nocturnal temperature decrease at sensor height (1.6 m) did not exhibit a uniform behavior at either site. It was expected that the rate of decrease would gradually slow, leveling off near sunrise. Instead, a leveling occurred several hours earlier. Temperature subsequently began a more rapid decrease which slowed by sunrise. This suggested that the temperature sensors may be detecting the frost point of water vapor. Analysis of alternative hypotheses demonstrates that none of these are viable candidates. The frost point interpretation is consistent with other lander and orbiter observations, with terrestrial experience, and with modeling of Mars' atmospheric behavior. It thus appears that the meteorology experiment can help provide a basis toward understanding the distribution and dynamics of Martian water vapor.
Ryan Alex J.
Sharman Robert D.
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