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Stable Atmospheric Surface Layer in Modelling with Constant Ground Temperature

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Abstract

Influence of the surface roughness, geostrophic wind speed and initial stable stratification on surface layer scales, namely the friction velocity, temperature scale and the Monin-Obukhov length, and on non-dimensional profiles has been studied in quasi-stationary PIAPBLM (Prague Institute of Atmospheric Physics Boundary Layer Model) runs. Modifications of the stability functions, of the non-local mixing length concept, and of surface layer parametrization have improved the model results. With the ground temperature kept constant in time, the boundary layer is subjected to a turbulent cooling induced by surface roughness and to a counteracting turbulent heat transfer directed downwards. If the wind speed is lower, a rather mixed layer develops capped by a more stable layer. The estimated Monin-Obukhov length then slightly increases and the non-dimensional gradients overpredict the empirical values even more.

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Authors and Affiliations

  1. Institute of Atmospheric Physics, Acad. Sci. Czech Republic, Prague, Czech Republic

    Pavel Sedlák

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  1. Pavel Sedlák
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Sedlák, P. Stable Atmospheric Surface Layer in Modelling with Constant Ground Temperature. Studia Geophysica et Geodaetica 42, 41–60 (1998). https://doi.org/10.1023/A:1023316305631

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  • DOI: https://doi.org/10.1023/A:1023316305631

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