'Dry Ice' Snowfall on Mars
Frozen carbon dioxide, better known as “dry ice,” requires temperatures of about minus 193 degrees Fahrenheit (minus 125 Celsius), which is much colder than needed for freezing water. Carbon dioxide snow reminds scientists that although some parts of Mars may look quite Earth-like, the Red Planet is very different. The report is being published in the Journal of Geophysical Research.
“These are the first definitive detections of carbon dioxide snow clouds,” said the report’s lead author Paul Hayne of NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, Calif. “We firmly establish the clouds are composed of carbon dioxide -- flakes of Martian air -- and they are thick enough to result in snowfall accumulation at the surface.”
The snow falls occurred from clouds around the red planet’s south pole in winter. The presence of carbon dioxide ice in Mars’ seasonal and residual southern polar caps has been known for decades. Also, NASA’s Phoenix Lander mission in 2008 observed falling water-ice snow on northern Mars.
Hayne and six co-authors analyzed data gained by looking at clouds straight overhead and sideways with the Mars Climate Sounder, one of six instruments on MRO. This instrument records brightness in nine wavebands of visible and infrared light as a way to examine particles and gases in the Martian atmosphere.
The data provide information about temperatures, particle sizes and their concentrations. The new analysis is based on data from observations in the south polar region during southern Mars winter in 2006-2007, identifying a tall carbon dioxide cloud about 300 miles (500 kilometers) in diameter persisting over the pole and smaller, shorter-lived, lower-altitude carbon dioxide ice clouds at latitudes from 70 to 80 degrees south.
Mars’ south polar residual ice cap is the only place on Mars where frozen carbon dioxide persists on the surface year-round. Just how the carbon dioxide from Mars’ atmosphere gets deposited has been in question. It is unclear whether it occurs as snow or by freezing out at ground level as frost. These results show snowfall is especially vigorous on top of the residual cap.
“The finding of snowfall could mean that the type of deposition -- snow or frost -- is somehow linked to the year-to-year preservation of the residual cap,” Hayne said.
Studying climate cycles, seasons, and weather on Mars is an important part of understanding the martian environment. Such information is important for astrobiologists who are trying to determine whether or not Mars was once habitable for life as we know it.