Mathematics – Logic
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p21d..02d&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P21D-02
Mathematics
Logic
[6225] Planetary Sciences: Solar System Objects / Mars
Scientific paper
Recent studies of Martian dune and non-dune gullies (consisting of alcove-apron or alcove-channel-apron morphology) have suggested a seasonal control on present-day gully activity. The timing of current gully activity, especially activity involving the formation or modification of channels (which commonly have been taken as evidence of fluvial processes), has important implications regarding likely gully formation processes and necessary environmental conditions. We present the results of a recent monitoring campaign of several active dune-gullies, so as to better identify the timing and sequence of activity, using the High Resolution Imaging Science Experiment (HiRISE) camera on the Mars Reconnaissance Orbiter (MRO). We observe several different types of activity occurring, including (1) alcove headward collapse, (2) the formation of new channels and apron deposits, and (3) the formation and elongation of thin channels with terminal blocks and/or pits. In particular, the timing of the most significant morphological changes (including formation of all major components of typical gullies and the movement of up to a few thousands of cubic meters of sand) are strongly associated with seasonal frost and defrosting activity. Our observations indicate that dune-gully formation on Mars is ongoing at a significant level today and likely driving processes are those controlled by the presence or removal of CO2 frost. Based on the consistency with activity type and timing observed in non-dune gullies, this implies that CO2 frost may drive a significant portion of present-day general gully activity.
Byrne Shane
Diniega Serina
Dundas Colin Morrisey
Hansen Camilla Juul
McEwen Alfred S.
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