Aerodynamic Variables in the Bulk Formulation of Turbulent Fluxes |
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| Authors: | Jielun Sun William Massman David A Grantz |
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| Institution: | (1) National Center for Atmospheric Research, USA;(2) USDA Forest Service, Fort Collins, CO, 80526, U.S.A.;(3) Department of Botany and Plant Sciences, Air Pollution Research Center, University of California, Riverside, Kearney Agricultural Center, Parlier, CA, 93648, U.S.A. |
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| Abstract: | Aerodynamic variables are required to apply Monin–Obukhov similarity theory in the bulk formulation of surface fluxes. In the literature, these aerodynamic variables are commonly misinterpreted. In this paper, we review the concept of the aerodynamic variable, its connection to surface-layer similarity theory and how and why the aerodynamic variable is replaced with other variables.Observed mean variables below the surface layer, such as the surface radiation temperature, or the air temperature at canopy height, are often used in place of the extrapolated aerodynamic variables in the bulk formula, requiring empirical relationships between aerodynamic and observed variables, or requiring empirical adjustments of bulk resistances. The present study examines the validity of these relationshi Experiment (CODE). The results indicate that using a measured substitute for an aerodynamic variable can lead to significant errors in estimates of turbulent surface fluxes. |
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| Keywords: | Aerodynamic temperature Bulk formula Monin– Obukhov similarity theory Roughness sublayer |
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