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Fluxes and Gradients in the Convective Surface Layer and the Possible Role of Boundary-Layer Depth and Entrainment Flux

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Abstract

We study the relation between fluxes and gradients in the very unstable surface layer by comparing recent proposals in the literature with the well-known Businger–Dyer functions. The recent proposals include results from large-eddy simulation (LES), which account for entrainment effects and effects of the boundary-layer depth. A comparison of the relationships is made with experimental data. The LES-based gradient functions show the impact of entrainment in the surface layer, but the scatter in the field data is too large to confirm this. Therefore this result is preliminary and future tests against new observations are recommended. It appears that the Businger–Dyer relationship behaves differently to the alternatives, and that it deviates from observations for large stability.

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Authors and Affiliations

  1. Meteorology and Air Quality, Wageningen University, Duivendaal 2, 6701, AP, Wageningen, The Netherlands

    G. J. Steeneveld, A. A. M. Holtslag & H. A. R. Debruin

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  1. G. J. Steeneveld
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  2. A. A. M. Holtslag
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  3. H. A. R. Debruin
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Correspondence to G. J. Steeneveld.

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Steeneveld, G.J., Holtslag, A.A.M. & Debruin, H.A.R. Fluxes and Gradients in the Convective Surface Layer and the Possible Role of Boundary-Layer Depth and Entrainment Flux. Boundary-Layer Meteorol 116, 237–252 (2005). https://doi.org/10.1007/s10546-004-2730-7

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  • DOI: https://doi.org/10.1007/s10546-004-2730-7

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