Of course, the frozen water/dirty ice could also be a remnant of an ancient glacier(s)
<http://uanews.opi.arizona.edu/cgi-bin/WebObjects/UANews.woa/wa/MainStoryDetails?ArticleID=3951">http://uanews.opi.arizona.edu/cgi-bin/WebObjects/UANews.woa/wa/MainStoryDetails?ArticleID=3951
(There is a possibility that those Martian 'fossils', exist: http://exobiology.nasa.gov/ssx/Selected_Research/exo_for_mars_intro.html)
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This one by Carter is interesting:
[The complimentary downward flow is by sheet-like movement over large areas. Tharsis and Elysium may be situated over two large plumes. Current average surface heat flow is estimated to be 40 mW/m2, as compared with the Earth’s 75 mW/m2.]
http://www.academicpress.com/solar/Contents/solarch12.pdf
I've ran accross a few of the Malin reports earlier this week.
Thank you, Alex.
Marcia
Space/Science » in reply to Interannual variability of weather in the Martian northern polar regions
Re: Interannual variability of weather in the Martian northern polar regions