Abstract
The dynamics of large-scale, horizontal roll vortices in the neutral planetary boundary layer are investigated by means of a two-dimensional numerical model. The rolls are assumed to be two-dimensional and are calculated explicitly, while small-scale turbulence is parametrized by a mixing-length hypothesis. Although buoyancy effects are never negligible in the atmosphere, the assumptions of the turbulence modelling are supported by atmospheric observations of large eddies which are highly elongated in a direction close to that of the geostrophic wind, together with the observed partitioning of turbulence energy between the large eddies and a distinctly smaller scale. The results indicate a strong sensitivity to the roll orientation, and also the presence of a slow variation on the Coriolis timescale.
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