Abstract
Abstract. The Non-Linear Mixed Spectral Finite-Difference (NLMSFD) model for surface boundary-layer flow over complex terrain has been extended to planetary boundary-layer flow over topography. Comparisons are made between this new version and the surface layer model. The model is also applied to simulate an Askervein experimental case. The results are discussed and compared with the observed field data.
Highlights
The Mixed Spectral Finite-Difference (MSFD) model was originally developed by Beljaars et al (1987)
It is based on the idea that the topography produces a perturbation to a steady, neutrally stratified, non-evolving flow over horizontally homogeneous flat terrain
In the non-linear version of the MSFD model (NLMSFD), the model equations were solved iteratively. Another model improvement is the extension to the stable boundary layer (MSFD-STAB, see Weng et al, 1997)
Summary
The Mixed Spectral Finite-Difference (MSFD) model was originally developed by Beljaars et al (1987). A number of efforts have been made to improve the model calculation of the turbulent boundary-layer flow over complex terrain. Ayotte et al (1994) evaluated the model predictions with a number of different closure schemes which range from the simple firstorder κ − Z closure to the full second-order closure. In the non-linear version of the MSFD model (NLMSFD), the model equations were solved iteratively. Another model improvement is the extension to the stable boundary layer (MSFD-STAB, see Weng et al, 1997). Ayotte and Taylor (1995) made the first effort to extend the model to the planetary boundary-layer flow with the full second-order turbulence closure (MSFD-PBL) but it was still a linear model
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