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Energy Deposition and Turbulent Dissipation Owing to Gravity Waves in the Mesosphere
Publisher: American Meteorological Society
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, ...
Shear and Static Instability of Inertia–Gravity Wave Packets: Short-Term Modal and Nonmodal Growth
Publisher: American Meteorological Society
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 ...
Optimal Growth in Inertia–Gravity Wave Packets: Energetics, Long-Term Development, and Three-Dimensional Structure
Publisher: American Meteorological Society
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 ...
Climatological Effects of Orography and Land–Sea Heating Contrasts on the Gravity Wave–Driven Circulation of the Mesosphere
Publisher: American Meteorological Society
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 ...
Radiating Instabilities of Internal Inertio-Gravity Waves
Publisher: American Meteorological Society
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 ...
The Role of Stationary Waves in the Maintenance of the Northern Annular Mode as Deduced from Model Experiments
Publisher: American Meteorological Society
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 ...
Normal Modes of the Atmosphere as Estimated by Principal Oscillation Patterns and Derived from Quasigeostrophic Theory
Publisher: American Meteorological Society
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 ...