Physics
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3722203c&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 22, CiteID L22203
Physics
2
Planetary Sciences: Solar System Objects: Mars
Scientific paper
NASA's Phoenix mission, which landed on the northern plains of Mars in 2008, returned evidence of the perchlorate anion distributed evenly throughout the soil column at the landing site. Here, we use spectral data from Phoenix's Surface Stereo Imager to map the distribution of perchlorate salts at the Phoenix landing site, and find that perchlorate salt has been locally concentrated into subsurface patches, similar to salt patches that result from aqueous dissolution and redistribution on Earth. We propose that thin films of liquid water are responsible for translocating perchlorate from the surface to the subsurface, and for concentrating it in patches. The thin films are interpreted to result from melting of minor ice covers related to seasonal and long-term obliquity cycles.
Arvidson Raymond E.
Catalano Jeffrey G.
Cull Selby C.
Lemmon Mark
Mellon Michael T.
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