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How did organic sand dunes form in Titan’s equatorial and temperate regions?

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Titan Titan, moon of Saturn, photographed by Voyager 2 on August 25, 1981, at a distance of 907,000 km (564,000 miles). Green and violet images were combined to make this photograph, which shows the extended atmosphere of the satellite.

The equatorial and temperate regions of Titan feature vast fields of dunes composed of windblown sand rich in organic compounds. These dunes are formed by the action of wind, which serves as a primary sculptor of the moon's surface alongside potential erosion from liquid methane rain.1

While the specific mechanics of dune formation on Titan mirror general aeolian processes—where wind velocity must exceed a threshold to transport particles—the material being moved consists of organic solids rather than the silicate grains common on Earth. These organic particles are transported and deposited by wind patterns, creating the extensive dune systems observed by the Cassini-Huygens mission across Titan's lower and middle latitudes.12