DIURNAL TEMPERATURE VARIATIONS: SURFACE TO 25 KILOMETERS 1

Abstract Vertical profiles of 12-hr temperature difference are examined for evidence of structure related to the topographically forced diurnal wind variations. Wavelike features are found with amplitude of the order of 1°C and wavelengths of the order of 5–15 km. These values agree with estimates inferred from the tidal wind field on the basis of continuity considerations. The diurnal temperature range in the planetary boundary layer decreases exponentially with height, with the decay rate varying markedly from one geographical region to another.