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By analyzing the Cooperative Atmosphere-Surface Exchange Study in 1999 (CASES-99), turbulence at a given height is found to be dominant by large eddies under near neutral conditions. These large eddies scale with the observation height and are closely related to the bulk shear between the ground and the observation height. The relationship between turbulence strength, local shear, and the bulk shear suggests a new way to parameterize turbulence at the bottom of the atmosphere.