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High Quality Content by WIKIPEDIA articles! The planetary boundary layer, also known as the atmospheric boundary layer, is the lowest part of the atmosphere and its behavior is directly influenced by its contact with a planetary surface. On Earth it usually responds to changes in surface forcing in an hour or less. In this layer physical quantities such as flow velocity, temperature, moisture etc., display rapid fluctuations and vertical mixing is strong. Above the PBL is the "free atmosphere" where the wind is approximately geostrophic while within the PBL the wind is affected by surface drag and turns across the isobars. The free atmosphere is usually nonturbulent, or only intermittently turbulent.