Chapter 4 discussed several types of deserts, including polar deserts. the center of the antarctic ice sheet, for example, receives very little precipitation each year and is regarded as a desert, although it does not match the customary idea of what a desert is. from this chapter we saw that:

precipitation generally decreases as temperature decreases (because saturation vapor pressure is much lower in cold air than in warm air).
much midlatitude and high-latitude precipitation occurs in extratropical storm systems that move along the polar front zone. the polar front zone is located in the latitudes where the temperature gradient is greatest. (this will be equatorward of the ice margin, where cold air draining off the ice cap moves equatorward to meet the warm air that is blowing poleward from the subtropical highs.)
put this information together in a systems diagram that has two feedback loops: one that links ice extent, albedo, temperature, and snowfall; and one that links ice extent, temperature, the location of the polar front zone, and snowfall.