Like Earth, Mars has clouds made of water ice. But unlike Earth, it also has clouds made of carbon dioxide (think: dry ice), which form when it gets cold enough for the Martian atmosphere to freeze locally. By understanding where and how these clouds appear, scientists hope to better understand the structure of Mars’ middle atmosphere, which is about 30 to 50 miles (50 to 80 kilometers) in altitude.
“We want to learn what triggers the formation of clouds – especially water ice clouds, which could teach us how high water vapor gets in the atmosphere – and during which seasons,” said Marek Slipski, a postdoctoral researcher at NASA’s Jet Propulsion Laboratory in Southern California.
That’s where Cloudspotting on Mars comes in. The project revolves around a 16-year record of data from the agency’s Mars Reconnaissance Orbiter (MRO), which has been studying the Red Planet since 2006. The spacecraft’s Mars Climate Sounder instrument studies the atmosphere in infrared light, which is invisible to the human eye. In measurements taken by the instrument as MRO orbits Mars, clouds appear as arches. The team needs help sifting through that data on Zooniverse, marking the arches so that the scientists can more efficiently study where in the atmosphere they occur.
“We now have over 16 years of data for us to search through, which is very valuable – it lets us see how temperatures and clouds change over different seasons and from year to year,” said Armin Kleinboehl, Mars Climate Sounder’s deputy principal investigator at JPL. “But it’s a lot of data for a small team to look through.”
While scientists have experimented with algorithms to identify the arches in Mars Climate Sounder data, it’s much easier for humans to spot them by eye. But Kleinboehl said the Cloudspotting project may also help train better algorithms that could do this work in the future. In addition, the project includes occasional webinars in which participants can hear from scientists about how the data will be used.
Cloudspotting on Mars is the first planetary science project to be funded by NASA’s Citizen Science Seed Funding program. The project is conducted in collaboration with the International Institute for Astronautical Sciences. For more NASA citizen science opportunities, go to science.nasa.gov/citizenscience.
JPL, a division of Caltech in Pasadena, California, leads the Mars Reconnaissance Orbiter mission – as well as the Mars Climate Sounder instrument – for NASA's Science Mission Directorate in Washington.