 Alpine planetary boundary layer

The Alpine planetary boundary layer (PBL) refers to the lower part of the atmosphere in alpine or mountainous regions, where the effects of the terrain significantly influence meteorological processes. The planetary boundary layer itself is the lowest part of the atmosphere, typically extending from the earth's surface up to about 1-2 kilometers (depending on local conditions), where turbulence, surface friction, and local heat exchanges play a dominant role in weather and climate phenomena.