Large seasonal variations in Triton's atmosphere

Consideration is given to the consequences of Triton's surface covering of volatile substances in view of the circularity of Neptune's orbit, which implies that Triton would have virtually no seasonal variations in either surface temperature or atmospheric bulk despite the complex precessional effects of its orbit. It is hypothesized that Triton's most volatile surface substances are probably relegated to latitudes higher than 35 deg, probably forming polar caps whose temperatures would be nearly equal even during the midwinter/midsummer peak insolation of the summer pole. If the summer pole completely sublimates during one of the 'major' summers, Triton's atmosphere may begin to freeze out over the winter caps and yield large and complex seasonal variations.