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Several distant icy worlds have atmospheres that are in vapor-pressureequilibrium with their surface volatiles, including Pluto, Triton, and,probably, several large KBOs near perihelion. Studies of the volatile andthermal evolution of these have been limited by computational speed, especiallyfor models that treat surfaces that vary with both latitude and longitude. Inorder to expedite such work, I present a new numerical model for the seasonalbehavior of Pluto and Triton which (i) uses initial conditions that improveconvergence, (ii) uses an expedient method for handling the transition betweenglobal and non-global atmospheres, (iii) includes local conservation of energyand global conservation of mass to partition energy between heating,conduction, and sublimation or condensation, (iv) uses time-stepping algorithmsthat ensure stability while allowing larger timesteps, and (v) can includelongitudinal variability. This model, called VT3D, has been used in Young(2012), Young (2013), Olkin et al. (2015), Young and McKinnon (2013), andFrench et al. (2015).

Volatile transport on inhomogeneous surfaces: II. Numerical calculations (VT3D)