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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-85
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-85
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 28 Jun 2019

Regular paper | 28 Jun 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

A quasi-experimental coastal region eddy diffusivity applied in the APUGRID model

Silvana Maldaner1, Michel Stefanello1, Luis Gustavo N. Martins1, Gervásio Annes Degrazia1, Umberto Rizza2, Débora Regina Roberti1, Franciano S. Puhales1, and Otávio C. Acevedo1 Silvana Maldaner et al.
  • 1Universidade Federal de Santa Maria, Santa Maria, Brazil
  • 2Institute of Atmospheric Sciences and Climate - National Research Council, Italy

Abstract. In this study, Taylor statistical diffusion theory and sonic anemometer measurements collected at 11 levels on a 140-m high tower located at a coastal region in southeastern Brazil have been employed to obtain quasi-empirical convective eddy diffusivity parameterizations in a planetary boundary layer (PBL). The derived algebraic formulations expressing the eddy diffusivities were introduced into an Eulerian dispersion model and validated with Copenhagen tracer experiments. The employed Eulerian model is based on the numerical solution of the diffusion-advection equation by the Fractional Step/Locally One-Dimensional (LOD) methods. Moreover, the semi-Lagrangian cubic-spline technique and Crank-Nicholson implicit scheme are considered to solve the advection and diffusive terms. The numerical simulation results indicate that the new approach, based on these quasi-experimental eddy diffusivities, is able to reproduce the Copenhagen concentration data. Therefore, the new turbulent dispersion parameterization can be applied in air pollution models.

Silvana Maldaner et al.
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Short summary
In this paper, a quasi-empirical convective eddy diffusivity parameterizations for a coastal site are obtained. In the derivation was used Taylor's theory of statistical diffusion and sonic anemometer observations collected at 11 levels on a 140-m high tower in a convective planetary boundary layer. The test of the derived coefficients was solved by solving the equation of diffusion-advection by the Fractional Step/Locally One-Dimensional (LOD) methods.
In this paper, a quasi-empirical convective eddy diffusivity parameterizations for a coastal...
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