Abstract
Mean wind speed profiles were measured by tracking radiosondes in the unstable atmospheric boundary layer (ABL) over the forested Landes region in southwestern France. New Monin-Obukhov stability correction functions, recently proposed following an, analysis by Kader and Yaglom, as well as the Businger-Dyer stability formulation were tested, with wind speeds in the surface sublayer to calculate the regional shear stress. These profile-derived shear stresses were compared with eddy correlation measurements gathered above a mature forest stand, at a location roughly, 4.5 km from the radiosonde launch site. The shear stress values obtained by means of the newly proposed stability function were in slightly better agreement with the eddy correlation values than those obtained by means of a Businger-Dyer type stability function. The general robustness of the profile method can be attributed in part to prior knowledge of the regional surface roughness (z 0=1.2 m) and the momentum displacement height (d 0=6.0 m), which were determined from neutral wind profile analysis. The 100 m drag coefficient for the unstable conditions above this broken forest surface was found to beu 2* /V 2100 =0.0173.
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André, J. C., Goutorbe, J. P., and Perrier, A.: 1986, ‘HAPEX-MOBILHY,: A Hydrologic Atmospheric Experiment for the Study of Water Budget and Evaporation Flux at the Climatic Scale’,Bull. Am. Meteorol. Soc. 67, 138–144.
André, J. C., Perrier, A., Goutorbe, J. P. (and 28 co-authors): 1988, ‘Evaporation over Land-Surfaces: First Results From HAPEX-MOBILHY Special Observing Period’,Ann. Geophysicae 6, 477–492.
Brutsaert, W.: 1992, ‘Stability Correction Functions for the Mean Wind Speed and Temperature in the Unstable Surface Layer’,Geophysical Res. Letters 19(5), 469–472.
Brutsaert, W. and Parlange, M. B.: 1992, ‘The Unstable Surface Layer Above Forest: Regional Evaporation and Heat Flux’,Water Resources Research (in press).
Brutsaert, W., Parlange, M. B. and Gash, J. H. C.: 1989, ‘Neutral Humidity Profiles in the Boundary Layer and Regional Evaporation for Sparse Pine Forest’,Ann. Geophysicae 7, 623–630.
Businger, J. A.: 1988, ‘A Note on the Businger-Dyer Profiles’,.Boundary-Layer Meteorol. 42, 145–151.
Cellier, P.: 1986, ‘On the Validity of Flux-gradient Relationships Above Very Rough Surfaces’,Boundary-Layer Meteorol. 36, 417–419.
Chen, F. and Schwerdtfeger, P.: 1989, ‘Flux-gradient Relationships for Momentum and Heat over a Rough Natural Surface’,Quart. J. Roy. Meteorol. Soc. 115, 335–352.
Denmead, O. T. and Bradley, E. F.: 1985, ‘Flux-gradient Relationships in Forest Canopy’, in B. A. Hutchison and B. B. Hicks (eds.),The Forest-Atmosphere Interaction, pp. 421–442, D. Reidel, Dordrecht
Dyer, A. J.: 1974), ‘A Review of Flux-Profile Relationships’.,Boundary-Layer Meteorol.7, 363–372.
Garratt, J. R.: 1978, ‘Flux-profile relations above Tall Vegetation’,Quart. J. Roy. Meteorol. Soc. 104, 199–212.
Garratt, J. R.: 1979, ‘Comments on the Paper “Analysis of Flux-profile Relationships above Tall Vegetation — An Alternative View”’,Quart J. Roy Meteorol. Soc. 105, 1079–1082.
Garratt, J. R.: 1980, ‘Surface Influence Upon Vertical Profiles in the Atmospheric Near-surface Layer’,Quart. J. Roy. Meteorol. Soc. 106, 803–819.
Gash, J. H. C., Shuttleworth, W. J., Lloyd, C. R., André, J. C., Goutorbe, J. P. and Gelpe, J.: 1989, ‘Micrometeorological Measurements in Les Landes During HAPEX-MOBILHY’,Agric. For. Meteorol. 46, 131–147.
Högström, U.: 1988, ‘Non-dimensional Wind and Temperature Profiles in the Atmospheric Surface Layer: A Re-evaluation’,Boundary-Layer Meteorol.42, 55–78.
Kader, B. A. and Yaglom, A. M.: 1990, ‘Mean Fields and Fluctuation Moments in Unstably Stratified Turbulent Boundary Layers’,J. Fluid Mech. 212, 637–662.
Parlange, M. B. and Brutsaert, W.: 1989, ‘Regional Roughness of the Landes Forest and Surface Shear Stress Under Neutral Conditions’,Boundary-Layer Meteorol. 48, 69–81.
Parlange, M. B. and Brutsaert, W.: 1990, ‘Are Radiosonde Time, Scales Appropriate to Characterize Boundary Layer Wind Profiles?’,J. Appl Meteorol. 29, 249–255.
Raupach, M. R.: 1979, ‘Anomalies in Flux-Gradient Relationships over Forest’,Boundary-Layer Meteorol. 16, 467–486.
Shuttleworth, W. J., et al. (13 co-authors): 1984, ‘Eddy Correlation Measurements of Eddy Partition for Amazonian Forest’,Quart. J. Roy. Meteorol. Soc. 110 1143–1162.
Shuttleworth, W. J., Gash, J. H. C., Lloyd, C. R., Moore C. J. and Wallace, J. S.: 1988, ‘An Integrated Micrometeorological System for Evaporation Measurement’,Agric For. Meteorol. 43, 295–317.
Thom, A. S., Stewart, J. B., Oliver, H. R. and Gash, J. H. C.: 1975, ‘Comparison of Aerodynamic and Energy Budget Estimates of Fluxes over a Pine Forest’,Quart. J. Roy. Meteorol. Soc. 101, 93–105.
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Parlange, M.B., Brutsaert, W. Regional shear stress of broken forest from radiosonde wind profiles in the unstable surface layer. Boundary-Layer Meteorol 64, 355–368 (1993). https://doi.org/10.1007/BF00711705
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DOI: https://doi.org/10.1007/BF00711705