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How might haze particles accumulate on Titan’s surface over long periods?

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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.

Titan’s pervasive haze consists of complex organic solids produced by the interaction of solar ultraviolet light with the moon’s nitrogen-methane atmosphere. These aerosol particles, which are roughly 0.1 micrometres in size, are continuously generated throughout the atmosphere.12

Over long periods, these haze particles settle slowly downward through the atmosphere and accumulate on the surface of Titan. Scientists estimate that the total amount of material produced throughout the moon's history is sufficient to have created a layer of organic solids covering the entire surface to a depth of at least hundreds of metres. Once on the surface, these organic compounds contribute to the formation of various geological features, including the vast fields of windblown dunes found in equatorial and temperate regions.13