Least action principle for a general, non-hydrostatic, compressible, acoustically non-filtered pressure-coordinate model

The least action principle is described for general (non-hydrostatic, compr essible, acoustically non-filtered) pressure-coordinate equations of atmosp heric dynamics (Room 1989), which represents a generalization of the Least Action Principle, first developed for the pressure-coordinate representatio n of atmospheric dynamics by Salmon and Smith (1994).