Using radar data collected by NASA’s Mars Reconnaissance Orbiter, a Southwest Research Institute-led team found evidence of an ice age recorded in the polar deposits of Mars. Ice ages on Mars are driven by processes similar to those responsible for ice ages on Earth, that is, long-term cyclical changes in the planet’s orbit and tilt, which affect the amount of solar radiation it receives at each latitude.
“We found an accelerated accumulation rate of ice in the uppermost 100 to 300 meters of the polar cap,” said Isaac Smith, a postdoctoral researcher at SwRI and lead author of a paper published in the May 27 issue of Science. “The volume and thickness of ice matches model predictions from the early 2000s. Radar observations of the ice cap provide a detailed history of ice accumulation and erosion associated with climate change.” [More at links; JPL release here]