Geostrophic and Quasi-Geostrophic Motions
In this chapter, further approximations to the primitive equations derived in Section 4.2.5 are considered, which are valid for situations characterized by a small Rossby number. Geostrophic balance is assumed to dominate for lateral scales comparable to the Rossby radius – leading to the quasi-geostrophic approximation – or on scales comparable to Earth’s radius – the planetary geostrophic approximation. The latter set of equations can be reformulated for an explicit expression for the absolute velocity.
KeywordsPotential Vorticity Relative Vorticity Vertical Vorticity Geostrophic Balance Bernoulli Function
Unable to display preview. Download preview PDF.