A robotic lander might have to work harder to dig for ice on some parts of Mars than others. New findings show underground ice depth can vary significantly on the Red Planet, being right at the surface in one spot but several feet down nearby.
"We find the top layer of soil has a huge effect on the water ice in the ground," said study author Joshua Bandfield of Arizona State University.
The research, detailed in the May 3 issue of the journal Nature, has implications for NASA's Phoenix mission, designed to drill down to sample the Martian ice.
Bandfield found the nature of the Martian topsoil determined how deep the ice was below it. Areas with many rocks at the surface "pump a lot of heat into the ground and increase the depth where you'll find stable ice," Bandfield explained.
"These two surface materials-rock and dust-vary widely across the ground, giving underground ice a patchy distribution," Bandfield said.
It was previously thought that Martian water ice was located at average depths of about 3 to 6 feet (1 to 2 meters), but Bandfield's new study shows it can be found as close as 2 inches (5 centimeters) from the surface.
Bandfield used computer models to analyze infrared images of water ice taken with the Thermal Emission Imaging System (THEMIS) on NASA's Mars Odyssey orbiter.
Phoenix "may find ground ice is shallower and much easier to reach in some spots than in others," Bandfield said.
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