The numerical experiments on applicating geostrophic momentum approximation to the baroclinic and non-neutral PBL |
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| Authors: | Zhao Ming |
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| Institution: | Department of Atmospheric Sciences, Nanjing University, Nanjing |
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| Abstract: | In this paper, Wu and Blumen’s boundary layer geostrophic momentum approximation model (Wu and Blumen, 1982) is applied to
baroclinic and non-neutral PBL, the motion equations for the PBL under the geostrophic momentum approximation are solved,
in which the eddy transfer coefficient is a function of the distributions of the wind and temperature. The results are compared
with those in barotropic and neutral conditions with the geostrophic momentum approximation. It is found that in the baroclinic
condition, the wind distribution has both the characteristics of a steady, homogeneous and baroclinic PBL and those caused
by the geostrophic momentum approximation. Those in non-neutral conditions show that they retain the intrinsic characteristics
for the wind in non-neutral PBL, at the same time, the effects of the large-scale advection and local variation are also included.
We can predict the wind in the non-neutral and baroclinic PBL by use of the geostrophic momentum approximation when the temporal
and spatial distributions of the geostrophic wind, as well as the potential temperatures and their variation rates at the
upper and lower boundary of the PBL are given by large-scale model. Finally, the model is extended to the case over sea surface. |
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