An international team of planetary scientists has detected patches of water frost sitting atop the Tharsis volcanoes on Mars, which are not only the tallest volcanic mountains on the Red Planet but in the entire solar system.
The discovery marks the first time frost has been spotted near the planet’s equator, challenging existing perceptions of the planet’s climate dynamics, according to the team’s new study in Nature Geoscience.
“We thought it was improbable for frost to form around Mars’ equator, as the mix of sunshine and thin atmosphere keeps temperatures during the day relatively high at both the surface and mountaintop - unlike what we see on Earth, where you might expect to see frosty peaks,” said Adomas Valantinas, a postdoctoral fellow at Brown University who led the work as a Ph.D. student at the University of Bern. “What we're seeing may be a remnant of an ancient climate cycle on modern Mars, where you had precipitation and maybe even snowfall on these volcanoes in the past.”
According to the study, the frost is present for only a few hours after sunrise before it evaporates in sunlight. The frost is also incredibly thin - likely only one-hundredth of a millimeter thick or about the width of a human hair. Still, it’s quite vast. The researchers calculate the frost constitutes at least 150,000 tons of water that swaps between the surface and atmosphere each day during the cold seasons. That’s the equivalent of roughly 60 Olympic-size swimming pools.
The researchers believe modelling how the frosts form could allow scientists to reveal more of Mars’ remaining secrets, including understanding where water exists and how it moves, as well as understanding the planet’s complex atmospheric dynamics, which is essential for future exploration and the search for possible signs of life.