Fig. 4: Comparison of the paleoclimate events inferred from the dunes with the grey level of North pole stratified strata and orbital parameters of Mars.
From: Martian dunes indicative of wind regime shift in line with end of ice age
a, The sequence of paleoclimate events inferred from the dunes (orange lines and labels represent sand accumulation events and dark blue lines and labels represent dune surface encrustation or agglomeration, respectively, and the dotted line with question marks (?) indicates unclear). b, The brightness profile versus pixel number for a section of the Mars Orbiter Camera image M00-02100 (bottom) on 13 April 1999 (Ls equal to roughly 123°), at latitude 86.48°. There are three similar cycles (N1, N2, N3) between pixels 100 and 1,000. The time axis was established by orbital tuning7. c, Martian obliquity and eccentricity curves3 over the last 1 Myr. The orange line shows the curve of obliquity and the blue line shows the curve of eccentricity.
