Iorek lives near the north pole. the snow in his backyard adds water to the atmosphere through transpiration evaporation sublimation condensation

Sublimation. It's the same effect as evaporation but sublimation means it goes from a solid state (snow) to a gas state. This phenomenon can be seen in your freezer, when ice cubes evaporate the moving particles on the surface fly off to the environment just like in liquids.

Organism, organ system, organs, tissue, cells