Neutral humidity profiles in the boundary layer and regional evaporation from sparse pine forest

W. Brutsaert, M. B. Parlange, J. H C Gash

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High-resolution radiosoundings provided specific humidity profiles in the atmospheric boundary layer above the forests of the Landes region of southwestern France. Under neutral conditions a logarithmic layer was observed for values of (z - d0) between approximately z - d0 = 43 (± 17) z0 and 117 (± 54) z0, where z is the height above the ground, d0 = 6.0 m the displacement height in the wind velocity profile and z0 = 1.2 m the surface roughness height; this height interval was roughly within the same range as that for the wind profile. The data did not indicate that the displacement height for water vapor d0v was significantly different from d0. Good agreement (r = 0.93) was obtained between profile-derived evaporation rates and values ρ (w′ q′), measured by means of an eddy-correlation system. -from Authors

Original languageEnglish
Pages (from-to)623-630
Number of pages8
JournalAnnales Geophysicae
Issue number6
Publication statusPublished - 1989
Externally publishedYes

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