On the secular evolution of groundwater on Mars

Details On the secular evolution of groundwater on Mars On the secular evolution of groundwater on Mars

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3624803g&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 24, CiteID L24803

Physics

6

Hydrology: Groundwater Hydrology, Hydrology: Modeling (1952), Planetary Sciences: Solid Surface Planets: Hydrology And Fluvial Processes, Planetary Sciences: Solar System Objects: Mars

Scientific paper

We modeled the subsurface transport of H2O and CO2 on Mars in a two-dimensional pole-to-equator cross-section, starting with sudden surface freezing representing ancient climate change. We find that excursions to low obliquity strongly drive ice sublimation and subsequent groundwater evaporation at low latitudes. This creates a hydraulic gradient in the saturated zone that moves water equatorward and even sublimates the base of high-latitude ice. Eventually, all H2O is lost at latitudes less than ˜30°. A subcryospheric vadose zone may be retained at higher latitudes, but ultimately only a few monolayers of adsorbed water will be held. A subcryospheric phreatic zone is preserved in the same regions only where lateral heterogeneity restricts horizontal fluid flow. The predicted contemporary state of Mars is drier and with groundwater—if present at all—in different locations than previously considered.

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