Journal ArticleDOI
The two‐day wave in a middle atmosphere GCM
W. A. Norton,John Thuburn +1 more
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A strong signal of the two-day wave is diagnosed in a middle atmosphere GCM, with characteristics very similar to those of the observed two day wave as discussed by the authors, but its global structure shows similarities to a Rossby-gravity planetary normal mode.Abstract:
A strong signal of the two-day wave is diagnosed in a middle atmosphere GCM, with characteristics very similar to those of the observed two-day wave. It results from an instability, but its global structure shows similarities to a Rossby-gravity planetary normal mode. It has a remarkable potential vorticity structure in wave 3 and sometimes wave 4 and higher wavenumbers. It is shown that gravity wave drag is important in maintaining the unstable zonal mean state.read more
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Gravity wave dynamics and effects in the middle atmosphere
TL;DR: In this article, a review of gravity wave sources and characteristics, the evolution of the gravity wave spectrum with altitude and with variations of wind and stability, the character and implications of observed climatologies, and the wave interaction and instability processes that constrain wave amplitudes and spectral shape are discussed.
Journal ArticleDOI
Implications for atmospheric dynamics derived from global observations of gravity wave momentum flux in stratosphere and mesosphere
Manfred Ern,Peter Preusse,John C. Gille,John C. Gille,Christopher L. Hepplewhite,Martin G. Mlynczak,James M. Russell,Martin Riese +7 more
TL;DR: In this article, the absolute values of gravity wave momentum flux are derived from global temperature measurements by the satellite instruments High Resolution Dynamics Limb Sounder (HIRDLS) and Sounding of the Atmosphere using Broadband Emission Radiometry (SABER).
Journal ArticleDOI
A spectral parameterization of mean-flow forcing due to breaking gravity waves
M. J. Alexander,T. J. Dunkerton +1 more
TL;DR: In this paper, a spectral parameterization of mean-flow forcing due to breaking gravity waves is described for application in the equations of motion in atmospheric models, based on linear theory and adheres closely to fundamental principles of conservation of wave action flux, linear stability, and wave-mean-flow interaction.
Journal ArticleDOI
Radiative‐dynamical climatology of the first‐generation Canadian middle atmosphere model
TL;DR: The Canadian Middle Atmosphere Modelling (MAM) project is a collaboration between the Atmospheric Environment Service (AES) of Environment Canada and several Canadian universities as mentioned in this paper, whose goal is the development of a comprehensive general circulation model of the troposphere-stratosphere-mesosphere system, starting from the AES/CCCma third-generation atmospheric General Circulation Model.
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Large-Scale Waves in the Mesosphere and Lower Thermosphere Observed by SABER
TL;DR: In this paper, a synoptic look at the mean structure and traveling waves of the mesosphere and lower thermosphere (MLT) has been provided by the TIMED satellite.
References
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Journal ArticleDOI
Alleviation of a systematic westerly bias in general circulation and numerical weather prediction models through an orographic gravity wave drag parametrization
TL;DR: In this paper, the failure to parametrize subgrid-scale orographic gravity wave drag may account for the westerly biases in the northern hemisphere wintertime flow of the Meteorological Office 15-layer operational model and 11-layer general circulation model.
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Baroclinic Instability of the Summer Mesosphere: A Mechanism for the Quasi-Two-Day Wave?
TL;DR: In this article, the authors reviewed observations of the quasi-two-day wave and concluded that the weight of evidence indicates that the wave is a solstical phenomenon, with maximum amplitudes in low latitudes of the summer mesosphere.
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The 2‐day wave in the middle atmosphere: Observations and theory
TL;DR: In this paper, the authors identify the disturbance's identification with the wave number 3 Rossby-gravity normal mode of a windless, isothermal atmosphere, which is found to exist largely independent of the mean fields.
Journal ArticleDOI
Numerical investigation of the propagation of the quasi-two-day wave into the lower thermosphere
TL;DR: In this paper, a series of numerical experiments for January conditions using a linearized spectral model which includes realistic mean winds and dissipation were conducted to characterize the propagation characteristics of the (3,0) mixed Rossby-gravity mode through the middle atmosphere and into the lower thermosphere.
Journal ArticleDOI
Observations of the quasi 2‐day wave from the High Resolution Doppler Imager on Uars
Dong L. Wu,Paul B. Hays,Wilbert R. Skinner,Alan R. Marshall,M. D. Burrage,Ruth S. Lieberman,David A. Ortland +6 more
TL;DR: In this paper, a strong westward traveling oscillation, with a period of 2 days and zonal wave number 3, is observed in the mesospheric and lower thermospheric winds from the High Resolution Doppler Imager (HRDI) on the Upper Atmosphere Research Satellite (UARS).