Nonlinear Normal Mode Initialization and Quasi-Geostrophic Theory

Abstract

The first iteration of the recently developed nonlinear normal mode initialization procedure for primitive equation models leads to quasi-rotational dynamical and diagnostic equations agreeing with those of quasi-geostrephic theory in a simple Boussinesq f plane model. The proper initialization of a quasi-rotational model, however. requires a nonlinear modification of the geostrophic state traditionally used. Various generalizations are discussed briefly. Abstract The first iteration of the recently developed nonlinear normal mode initialization procedure for primitive equation models leads to quasi-rotational dynamical and diagnostic equations agreeing with those of quasi-geostrephic theory in a simple Boussinesq f plane model. The proper initialization of a quasi-rotational model, however. requires a nonlinear modification of the geostrophic state traditionally used. Various generalizations are discussed briefly.