The thawing "dry ice" of Mars
An international team of researchers studying data beamed back by NASA's Mars Reconnaissance Orbiter have observed seasonal changes on far-northern sand dunes on the Red Planet caused by warming of a winter blanket of frozen carbon dioxide.
Earth has no naturally frozen carbon dioxide, although pieces of manufactured carbon-dioxide ice, called "dry ice," sublime directly from solid to gas on Earth, just as the vast blankets of dry ice do on Mars.
"A driving factor in the springtime changes where seasonal coverings of dry ice form on Mars is that thawing occurs at the underside of the ice sheet, where it is in contact with dark ground being warmed by early-spring sunshine through translucent ice," explained Candice Hansen of the Planetary Science Institute, Tucson.
"The trapped gas builds up pressure and breaks out in various ways. Transient grooves form on dunes when gas trapped under the ice blanket finds an escape point and whooshes out, carrying out sand with it."
According to Hansen, the expelled sand initially forms dark fans or streaks on top of the ice layer, but this evidence disappears with the seasonal ice, while summer winds erase most of the grooves in the dunes before the next winter. Indeed, the grooves are smaller features than the gullies that earlier research linked to carbon-dioxide sublimation on steeper dune slopes.
Interestingly, similar activity has been documented and explained previously where seasonal sheets of frozen carbon dioxide form and thaw near Mars' south pole. The findings reinforce growing appreciation that Mars today, however different from its former self, is still a dynamic world, and however similar to Earth in some respects, displays some quite unearthly processes.
"It's an amazingly dynamic process," said Hansen. "We had this old paradigm that all the action on Mars was billions of years ago. Thanks to the ability to monitor changes with the Mars Reconnaissance Orbiter, one of the new paradigms is that Mars has many active processes today."
With three Martian years (six Earth years) of data gathered by the Mars Reconnaissance Orbiter's High Resolution Imaging Science Experiment (HiRISE) camera, the researchers were able to comprehensively examine and analyze a variety of seasonal changes.
The spring changes include outbursts of gas carrying sand, polygonal cracking of the winter ice blanketing the dunes, sandfalls down the faces of the dunes, and dark fans of sand propelled out onto the ice.
"It is a challenge to catch when and how those changes happen, they are so fast," noted Ganna Portyankina of the University of Bern in Switzerland. "That's why only now we start to see the bigger picture that both hemispheres actually tell us similar stories."
The process of outrushing gas that carves grooves into the northern dunes resembles the process creating spider-shaped features in far southern Mars, but the spiders have not been seen in the north.
The seasonal dry-ice sheets overlie different types of terrain in the two hemispheres. In the south, diverse terrains include the flat, erodible ground where the spiders form, but in the north, a broad band of sand dunes encircles the permanent north polar ice cap.
Another distinct difference is in brightening on parts of the ice-covered dunes. This brightening in the north results from the presence of water-ice frost, while in the south, similar brightening is caused by fresh carbon dioxide and light water frost is blown around by spring winds.