"planetary surface" refers to the outer layer or ground of a planet. It includes the land, rocks, soil, and any other materials that make up the solid part of a planet's surface, excluding any oceans, atmospheres, or space above it. Full definition
Unless one can properly appreciate the nature and scale of the effect that an atmosphere has on planetary surface temperature the entire underlying debate is impossible to assess meaningfully. (newclimatemodel.com)
«It is true we need to gain experience exploring planetary surfaces, but in fact we've done some of that,» he said at the meeting. (newscientist.com)
And the global mean temperature is indeed a function of the temperature over the whole planetary surface. (realclimate.org)