Gradient-based similarity in the atmospheric boundary layer |
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| Authors: | Zbigniew Sorbjan |
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| Institution: | (1) Department of Physics, Marquette University, Milwaukee, Wisconsin, USA |
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| Abstract: | The “flux-based” and “gradient-based” similarity in the stable boundary layer and also in the interfacial part of the convective
boundary layer is discussed. The stable case is examined on the basis of data collected during the CASES-99 experiment. Its
interfacial counterpart is considered in both the quasi-steady (mid-day) and non-steady states, utilizing the results of large-eddy
simulations.
In the stable regime, the “gradient-based” approach is not unique and can be based on various master length scales. Three
local master length scales are considered: the local Monin-Obukhov scale, the buoyancy scale, and the Ellison scale. In the
convective “quasi-steady” (mid-day) case, the “mixed layer” scaling is shown to be valid in the mixed layer and invalid in
the interfacial layer. The temperature variance profile in non-steady conditions can be expressed in terms of the convective
temperature scale in the mixed layer. The analogous prediction for velocity variances is not valid under non-steady conditions. |
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| Keywords: | atmospheric boundary layer flux-based scaling gradient-based scaling similarity theory |
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