The seasonal cycle of water on Mars

Computer Science

Scientific paper

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Annual Variations, Atmospheric Moisture, Mars Atmosphere, Mars Surface, Water Vapor, Adsorption, Ice, Polar Caps, Sinks, Vertical Distribution, Mars, Water, Seasonal Variations, Review, Atmosphere, Transport, Ice, Polar Regions, Ice Caps, Time Scale, Distribution, Clouds, Observations, Adsorption, Regolith, Vapor, Chemistry

Scientific paper

A review of the behavior of water in the Mars atmosphere and subsurface is appropriate now that data from the Mariner and Viking spacecraft have been analyzed and discussed for several years following completion of those missions. Observations and analyses pertinent to the seasonal cycle of water vapor in the atmosphere of Mars are reviewed, with attention toward transport of water and the seasonal exchange of water between the atmosphere and various non-atmospheric reservoirs. Possible seasonally-accessible sources and sinks for water include water ice on or within the seasonal and residual polar caps; surface or subsurface ice in the high-latitude regions of the planet; adsorbed or chemically-bound water within the near-surface regolith; or surface or subsurface liquid water. The stability of water within each of these reservoirs is discussed, as are the mechanisms for driving exchange of the water with the atmosphere and the timescales for exchange. Specific conclusions are reached about the distribution of water and the viability of each mechanism as a seasonal reservoir. Discussion is also included of the behavior of water on longer timescales, driven by the variations in solar forcing due to the quasi-periodic variations of the orbital obliquity. Finally, specific suggestions are made for future observations from spacecraft which would further define or constrain the seasonal cycle of water.

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