Geostrophic coordinates

From Glossary of Meteorology



geostrophic coordinates

The coordinate system used in the semigeostrophic equations.

Geostrophic coordinates (X, Y, Z, T) are related to physical space coordinates (x, y, z, t) by
ams2001glos-Ge21
where ug and vg are the eastward and northward geostrophic winds and f is the Coriolis parameter. Through this coordinate transform the semigeostrophic equations arise. The geostrophic approximation is not used as frequently in the semigeostrophic equations as in the quasigeostrophic equations; thus the semigeostrophic equations produce a more accurate representation of certain phenomena, such as fronts and jets.


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