(For comparison, Earth's much denser atmosphere contains only 0.041% of carbon dioxide.) Mars' atmosphere contains 96% carbon dioxide ,but the atmospheric pressure there is very low. That changes the behavior of carbon dioxide molecules.
During the day, as the sun's rays hit and warm the Martian rock, convective drafts and turbulence stir this layer of Martian air, also known as the Planetary Boundary Layer. The scientists say this strange behavior could be explained by thermal fluctuations in the first 6 miles (10 kilometers) of Mars' atmosphere above the planet's surface. Department of Energy facility in New Mexico, using a microphone on Perseverance's SuperCam instrument revealed that higher-pitched sound travels faster on Mars than lower notes, which is something that hasn't been observed anywhere else. Measurements made by a team of scientists from Los Alamos National Laboratory, a U.S. Scientists measured the speed of sound on Mars using a microphone on the SuperCam instrument on NASA's Perseverance rover.
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