Comments on: ‘Elimination of spurious inertial oscillations in boundary-layer models with time-dependent geostrophic winds’

✍ Scribed by P. A. Taylor

• Publisher: Springer
• Year: 1989
• Tongue: English
• Weight: 102 KB
• Volume: 48
• Category: Article
• ISSN: 0006-8314
• DOI: 10.1007/bf00123066

✦ Synopsis

Egger and Schmid (1988)

present an interesting discussion of inertial oscillations generated in 1-D boundary-layer models with imposed, time-dependent pressure gradients (geostrophic winds). They propose a scheme to eliminate the unwanted oscillations through a modification of the imposed pressure gradient (geostrophic forcing). At first sight, this may appear somewhat arbitrary. These comments are intended to offer some clarification and a rationale for their scheme.

In the idealised, one-dimensional case of a time-dependent flow above a horizontally homogeneous flat f-plane, Egger and Schmid, hereafter referred to as ES, note that for the inviscid flow above the boundary-layer, the 'free atmosphere' velocity, which we shall denote by vf, will satisfy a"=-fk P