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The Ekman boundary layer over orography: An analysis of vertical motion by Rongsheng Wu; William Blumen is a Environmental Science article available to read on EtoBox.

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A model of the planetary boundary layer is used to determine the field of vertical motion over large-scale orography. This model represents Ekman boundary-layer dynamics modified by the inclusion of accelerations of the geostrophic wind under the geostrophic momentum approximation. The orography is represented by a circular mountain. The inviscid solution is provided by the sum of a constant translation and a steady, uniform potential vorticity, anticyclonic vortex. The boundarylayer solution vanishes on the mountain. but is matched to the inviscid solution as the top of the boundary layer is approached. The vertical velocity field at the top of the boundary layer is determined by integration of the continuity equation. The field of motion is largely determined by descent from above into the anticyclonic circulation, as in the classical Ekman model. Contributions that arise from the inclusion of accelerations are associated with boundary-layer advection and ageostrophic divergence that produce vorticity tendencies. Finally. the boundary-layer vertical motion is shown to be comparable in magnitude to the vertical motion forced by inviscid fow over the orography. although the distrib

Who reads The Ekman boundary layer over orography: An analysis of vertical motion?

Author

Rongsheng Wu; William Blumen

Publisher

Springer; Springer-Verlag; Kluwer Academic Publishers; Springer Science and Business Media LLC (ISSN 0006-8314)

Published

1991

Language

EN

Field

Environmental Science (Physical Sciences)