planetary boundary layer

…If no disturbance occurs, the height at which ground friction reaches, i.e., the boundary layer height, is about 2m, but if disturbance occurs, it can extend to several hundred meters to several kilometers. This atmospheric layer is called the atmospheric boundary layer or planetary boundary layer. Within the atmospheric boundary layer, the layer of air several tens of meters in contact with the earth's surface is called the surface layer, in which the flux of heat and momentum is considered to be almost constant regardless of altitude, and the vertical distribution of wind speed can be approximated by a logarithmic law. …

*Some of the terminology that refers to the "planetary boundary layer" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…乱れが生じなければ地面摩擦の及ぶ高さ，すなわち境界層高度は2mぐらいであるが，乱れが生じると数百mから数kmに及ぶことになる。この大気層を大気境界層あるいはプラネタリー境界層planetary boundary layerと呼んでいる。大気境界層のうち，地表面に接する数十mの気層は接地層と呼ばれ，熱や運動量の流束(フラックスflux)が高度によらずほぼ一定とみなされ，風速の鉛直分布は対数法則で近似できる。…

※「planetary boundary layer」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報