planetary boundary layer Geology and Earth Sciences
The layer of the lower atmosphere extending to a height of about 500 m above the ground, in which frictional effects of the underlying surface generate turbulence. See alsoturbulent boundary layer.
Geography
The lowest 500 m of the troposphere; the layer most strongly influenced by the land, or sea, beneath it. See Amarydis et al. (2007) Atmos. Chem. Phys. Discuss 7, 13537–660.