A Martian meteorology study reveals rapidly falling snow above the planet’s surface.
Although Mars has very little water vapor in its atmosphere, ice clouds can still form above the red planet. Now, new research finds that these clouds unleash rapidly falling snow at night.
ResearchGate: What are the snowstorms like?
Montmessin: Most of the time, Martian cloud particles evaporate before they reach the surface, like virgas on Earth. Water-ice cloud particles form during the cold Martian night. Because they are able to cool the surrounding atmosphere—by losing heat through the emission of infrared radiation—they can lead to cold air over warmer air within the cloud.
This unstable condition triggers a descending plume of snow.
These turbulent storms, which can only form at night, act to vigorously mix the atmosphere, and in some places, deposit snow on the Martian surface.
We propose that Martian snowstorms are analogous to small localized storms on Earth called microbursts, in which cold dense air carrying snow or rain is rapidly transported downwards from a cloud.
Source: Mars has snowstorms at night