Mathematics – Logic
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p12e..11c&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #P12E-11
Mathematics
Logic
1655 Water Cycles (1836), 5416 Glaciation, 5470 Surface Materials And Properties, 6225 Mars
Scientific paper
Mars Global Surveyor-based discovery of pristine martian gullies (Malin and Edgett, 2000) signaled a more recently hydrologically active Mars than previously thought (Baker et al., 2001, Cabrol et al., 2001, Dohm et al., 2001, Kargel, 2001, Mustard et al., 2001). Although analyses showed tantalizing clues that the gullies could be recent (e.g., little erosion, few accumulation of wind material in their channels, superimposition on recent dune fields, and lack of impact craters), there has been, and will be, no definitive proof of their possible current activity unless MOC images provide evidence that they have been modified by new flow episodes during the time of the MGS mission and/or future orbital mission surveys. Moreover, the gullies are observed outside of the regions where water has been theorized to be currently stable (Haberle et al., 2000), forming a basis for the idea that they formed earlier. However, our new findings show: (a) overwhelming morphological evidence for very recent climate change in the southern mid latitudes, which includes receding glaciers, creep terracettes, rock glaciers, and mudflows, (b) typical glaciers lifetimes of few tens to hundreds of thousands of years, also suggestive of recent climate change, and (c) likely current activity of gullies, creep terracettes, and rock glaciers triggered by a lagged response in the martian permafrost to a recent environmental change. The implications of this collection of climate-induced evidence are of critical importance to future unmanned and manned missions in that aqueous environments can be accessed and analyzed.
Cabrol Nathalie A.
Dohm James M.
Grin Edmon A.
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