Abstract: An attempt is made to define the thermodynamics of internal gravity waves breaking in the middle atmosphere on the basis of the energy conservation law for finite fluid volumes. Consistent with established turbulence theory, ...

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: On the basis of permanent January simulations performed with an idealized general circulation model for the troposphere and middle atmosphere, the sensibility of the general circulation to orographic and thermal forcing ...

Abstract: The vertical radiation of local convective and shear instabilities of internal inertio-gravity waves is examined within linear stability theory. A steady, plane-parallel Boussinesq flow with vertical profiles of horizontal ...

Abstract: The influence of stationary waves on the maintenance of the tropospheric annular mode (AM) is examined in a simple global circulation model with perpetual January conditions. The presented model experiments vary in the ...

Abstract: The principal oscillation pattern (POP) analysis is a technique to empirically identify time-dependent spatial patterns in a multivariate time series of geophysical or other data. In order to investigate medium-scale and ...