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RISThe Mechanism for the Scale Selection of Tropical Intraseasonal Oscillations. Part I: Selection of Wavenumber 1 and the Three-Scale Structure
Publisher: American Meteorological Society
Abstract: The mechanism for the scale selection of tropical intraseasonal oscillations (ISO) is examined in a stepwise procedure with the use of two models, which differ only in the cumulus parameterization. In the first model, ...
Reconsideration of the True versus Apparent Arctic Oscillation
Publisher: American Meteorological Society
Abstract: The physical reality of the Arctic Oscillation (AO; or northern annular mode) is considered. The data used are mainly the monthly mean sea level pressure (SLP). A schematic figure is first presented to illustrate the ...
Untitled
Publisher: American Meteorological Society
Abstract: AbstractTo understand the slow eastward propagation of the Madden?Julian oscillation (MJO), the authors propose a new mechanism of slow eastward propagation of an unstable disturbance [slow eastward-propagating disturbance ...
The Generation Mechanism of Mixed Rossby-Gravity Waves in the Equatorial Troposphere
Publisher: American Meteorological Society
Abstract: Numerical experiments are performed to clarify the excitation mechanism of mixed Rossby-gravity waves (Yanai waves) in the tropical troposphere, as well as the selection of zonal wavenumbers 4?5 and of the five-day period. ...
Multiple Attractors and Chaotic Itinerancy in a Quasigeostrophic Model with Realistic Topography: Implications for Weather Regimes and Low-Frequency Variability
Publisher: American Meteorological Society
Abstract: A detailed analysis of the bifurcation structure of a two-level, quasigeostrophic model is made by a combined use of a continuation algorithm and extensive time integrations. The model is formulated on a sphere with realistic ...
Weather Regimes, Low-Frequency Oscillations, and Principal Patterns of Variability: A Perspective of Extratropical Low-Frequency Variability
Publisher: American Meteorological Society
Abstract: The dynamical basis of extratropical low-frequency variability (LFV) is investigated using a quasigeostrophic model on a sphere with realistic Northern Hemisphere topography. The model is driven by Newtonian relaxation to ...
The Importance of the Nontraditional Coriolis Terms in Large-Scale Motions in the Tropics Forced by Prescribed Cumulus Heating
Publisher: American Meteorological Society
Abstract: n meteorological dynamics, the shallow-atmosphere approximation is generally used in the momentum equation, together with the ?traditional approximation.? In the traditional approximation, two cosine Coriolis terms [hereafter ...
Vortex–Vortex Interactions for the Maintenance of Blocking. Part II: Numerical Experiments
Publisher: American Meteorological Society
Abstract: he selective absorption mechanism (SAM), newly proposed in Part I of this study on the maintenance mechanism of blocking, is verified through numerical experiments. The experiments were based on the nonlinear equivalent-barotropic ...
Vortex–Vortex Interactions for the Maintenance of Blocking. Part I: The Selective Absorption Mechanism and a Case Study
Publisher: American Meteorological Society
Abstract: new block maintenance mechanism, the selective absorption mechanism (SAM), is proposed. According to this mechanism, which is based on vortex?vortex interactions (i.e., the interactions between a blocking anticyclone and ...
Coupling between Tropospheric and Stratospheric Leading Modes
Publisher: American Meteorological Society
Abstract: Coupling between tropospheric and stratospheric leading modes in anomaly fields is investigated. By using daily data at many levels in addition to monthly mean data, the transition of spatial patterns and the direction and ...