Modeling water ice lifetimes at recent Martian gully locations

Details Modeling water ice lifetimes at recent Martian gully locations Modeling water ice lifetimes at recent Martian gully locations

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3409204w&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 9, CiteID L09204

Physics

4

Planetary Sciences: Solid Surface Planets: Ices, Planetary Sciences: Solid Surface Planets: Erosion And Weathering, Planetary Sciences: Solid Surface Planets: Glaciation

Scientific paper

Mars Global Surveyor identified two instances of recent changes in gully morphology. Images suggest that two gullies had recent discharges of some liquid, leaving a residue behind. The residue might be water ice mixed with dust. We applied a thermodynamic model to these two locations to determine the lifetime of the hypothetical water ice. We find that a very dusty 2m-thick icepack of moderate density would completely disappear within 1-2 Mars years by sublimation. If the bright deposits are actually ice then we would expect to see them absent in images taken several Mars years from now, unless they are being replenished.

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