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Z-Less stratification under stable conditions

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Abstract

Turbulent fluctuations were measured at a height of 2.5 m in stable conditions over grass to investigate the variability of the second- and third-order moments involving temperature, humidity and vertical wind velocity. With the exception of the normalized second moment of temperature, very little variation of the normalized moments was found with changes in the dimensionless stability parameter ζ=z/L, whereL is the Obukhov stability length. Such limited variation is expected for stable conditions, and the normalized second moment of temperature might have been affected by nonstationary conditions. In addition, the variability of the normalized moments was lessened by computing the turbulence statistics over 56 min, instead of 26 min. Values of third-order moments involving the vertical velocity were all close to zero.

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Dias, N.L., Brutsaert, W. & Wesely, M.L. Z-Less stratification under stable conditions. Boundary-Layer Meteorol 75, 175–187 (1995). https://doi.org/10.1007/BF00721048

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