Physics
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30opla1k&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 15, pp. PLA 1-1, CiteID 1815, DOI 10.1029/2003GL017795
Physics
16
Planetary Sciences: Glaciation, Planetary Sciences: Erosion And Weathering, Planetary Sciences: Orbital And Rotational Dynamics, Planetology: Solar System Objects: Mars
Scientific paper
A map of north-south subkilometer-scale slope asymmetry on Mars obtained from statistical analysis of along-track MOLA topographic profiles reveals well-defined zonal belts of north-south slope asymmetry at 40-50° latitude in both hemispheres. In these narrow anomalous belts the pole-facing slopes are systematically gentler than equator-facing slopes. This asymmetry is especially pronounced for the steepest (>20°) slopes, in which pole-facing slopes are three times less frequent than >20° slopes facing the equator. We interpret these belts to be related to insolation asymmetry. Specifically, we suggest that summertime melting of ground ice on pole-facing slopes occurred during periods of very high obliquity (~45°) in the past and favored downslope movement of material and reduction of steep pole-facing slopes.
Head James W.
Kreslavsky Mikhail A.
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