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RISVertical Wind Disturbances in the Troposphere and Lower Stratosphere Observed by the MU Radar
Publisher: American Meteorological Society
Abstract: An analysis is made of vertical wind disturbances (VWDs) observed by the MU radar (Shigaraki, Shiga, Japan) in terms of the wave structures, sources, and vertical momentum flux. First, it is shown through spectral and ...
Small-Scale Wind Disturbances Observed by the MU Radar during the Passage of Typhoon Kelly
Publisher: American Meteorological Society
Abstract: This paper describes small-scale wind disturbances associated with Typhoon Kelly (October 1987) that were observed by the MU radar, one of the MST (mesosphere, stratosphere, and troposphere) radars, continuously for about ...
Gravity Wave Generation around the Polar Vortex in the Stratosphere Revealed by 3-Hourly Radiosonde Observations at Syowa Station
Publisher: American Meteorological Society
Abstract: Intensive radiosonde observations were performed at Syowa Station (69.0°S, 39.6°E) over about 10 days in each of March, June, October, and December 2002 to examine inertia?gravity wave characteristics in the Antarctic lower ...
Secondary Generation of Gravity Waves Associated with the Breaking of Mountain Waves
Publisher: American Meteorological Society
Abstract: The generation of small-scale gravity waves associated with the breaking of mountain waves in the stratosphere has been simulated within a fully compressible, nonhydrostatic, two-dimensional numerical model. The model ...
A Formulation of Unified Three-Dimensional Wave Activity Flux of Inertia–Gravity Waves and Rossby Waves
Publisher: American Meteorological Society
Abstract: companion paper formulates the three-dimensional wave activity flux (3D-flux-M) whose divergence corresponds to the wave forcing on the primitive equations. However, unlike the two-dimensional wave activity flux, 3D-flux-M ...
A Formulation of Three-Dimensional Residual Mean Flow Applicable Both to Inertia–Gravity Waves and to Rossby Waves
Publisher: American Meteorological Society
Abstract: he three-dimensional (3D) residual mean flow is expressed as the sum of the Eulerian-mean flow and the Stokes drift. The present study derives formulas that are approximately equal to the 3D Stokes drift for the primitive ...
A Formulation of Three-Dimensional Residual Mean Flow and Wave Activity Flux Applicable to Equatorial Waves
Publisher: American Meteorological Society
Abstract: he large-scale waves that are known to be trapped around the equator are called equatorial waves. The equatorial waves cause mean zonal wind acceleration related to quasi-biennial and semiannual oscillations. The interaction ...
Gravity Wave–Induced Anomalous Potential Vorticity Gradient Generating Planetary Waves in the Winter Mesosphere
Publisher: American Meteorological Society
Abstract: his study shows that gravity wave (GW) forcing (GWF) plays a crucial role in the barotropic/baroclinic instability that is frequently observed in the mesosphere and considered an origin of planetary waves (PWs) such as ...
An Amplification Mechanism of Medium-Scale Tropopausal Waves
Publisher: American Meteorological Society
Abstract: The mechanism for the amplification of medium-scale tropopausal waves (with horizontal wavelengths of 2000?3000 km and wave periods of 1?2 days) that are basically neutral is investigated using a three-dimensional wave-activity ...
Formation of Two-Dimensional Circulation in Response to Unsteady Wave Forcing in the Middle Atmosphere
Publisher: American Meteorological Society
Abstract: AbstractIn previous studies, a steady-state assumption has been frequently used for the analysis of wave-induced meridional circulation. In general, however, the wave forcing is not constant and thus induced circulation ...