FRICTION LAYER

frictionless 无摩擦的

tetalau-tin

The thin layer of atmosphere adjacent to the earth's surface. Surface friction is effective in slowing down wind up to approximately 1,500 to 3,000 feet above the ground. Above this level, air tends to flow parallel to the isobars. Wind distribution within this layer is determined by vertical temperature gradient and the physical contours of the underlying surface features. Also known as a surface boundary layer or boundary layer.