Abstract: The primary nonlinear dynamics of high-frequency gravity waves (HGWs) perturbed by their most prominent normal modes (NMs) or singular vectors (SVs) in a rotating Boussinesq fluid have been studied by direct numerical ...

Abstract: The breaking of an inertia?gravity wave (IGW), initiated by its leading normal modes (NMs) or singular vectors (SVs), and the resulting small-scale eddies are investigated by means of direct numerical simulations of a ...

Abstract: This work discusses the formulation and testing of a simplified model of atmospheric dynamics. The model, which has only 200- and 700-mb streamfunctions as its prognostic fields, is designed to have a climate that approximates ...

Abstract: The problem of nonmodal instabilities of inertia?gravity waves (IGW) in the middle atmosphere is addressed, within the framework of a Boussinesq model with realistic molecular viscosity and thermal diffusion, by singular-vector ...

Abstract: Using a hierarchy of three models of increasing realism and complexity, and expanding on a previous study, optimal perturbations of inertia?gravity wave (IGW) packets are studied with respect to several aspects. It is shown ...

Abstract: he three-dimensionalization of turbulence in the breaking of nearly vertically propagating inertia?gravity waves is investigated numerically using singular vector analysis applied to the Boussinesq equations linearized ...

Abstract: A recently developed class of semiempirical low-order models is utilized for the reexamination of several aspects of the complexity and nonlinearity of large-scale dynamics in a GCM. Given their low dimensionality, these ...

Abstract: In a continuation of previous investigations on deterministic reduced atmosphere models with compact state space representation, two main modifications are introduced. First, primitive equation dynamics is used to describe ...

Abstract: urran?s pseudo-incompressible equations are integrated in a mass and momentum conserving way with a new implicit turbulence model. This system is soundproof, which has two major advantages over fully compressible systems: ...