Titan's Atmosphere

Titan is unique in all the natural satellites of the solar system in having a dense, complex atmosphere.

Wind Patterns
Like Earth's atmosphere, prevailing wind patterns are driven by solar radiation. Gases near the equator are heated, causing them to rise, while gases near the poles are heated less, causing them to sink. Each of these flows moves laterally into the space left by the other, creating a circulation pattern called a Hadley cell. While Earth's atmosphere has three Hadley cells, Titan has a single such cell stretching all the way from the equator to the poles.

Composition
Titan's atmosphere is almost entirely nitrogen (94%), with methane a distant second. Many other hydrocarbons are present, but in trace amounts.

One of the by-products of methane breakdown is proplylene in the lower atmosphere, a boon to the locals.