In a previous post, I set the stage for my recently published paper in JGR Planets.
A recap: we've got good evidence for a change in Mars's climate. Widespread ripples in Meridiani Planum formed >200,000 years ago, last migrated westward more than ~50,000 years ago, had their crests reformed into little dunes by a slightly different wind sometime after that, but have been dormant ever since.
Meanwhile, we know that over that same time period, Mars' orbit and axial tilt have varied, which can affect wind patterns. Moreover, over this period, those same planetary changes led to a stepwise sequestration of atmospheric... read more ❯