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RISAn Accurate Spectral Nonorographic Gravity Wave Drag Parameterization for General Circulation Models
Publisher: American Meteorological Society
Abstract: An accurate method of solution is developed for the Warner and McIntyre parameterization of nonorographic gravity wave drag for the case of hydrostatic dynamics in the absence of rotation. The new scheme is sufficiently ...
The Influence of the Basic State on the Northern Hemisphere Circulation Response to Climate Change
Publisher: American Meteorological Society
Abstract: Employing a comprehensive atmospheric general circulation model, the authors have shown in a previous study that the time-mean Northern Hemisphere (NH) winter circulation response to a CO2 doubling perturbation depends ...
The GCM Response to Current Parameterizations of Nonorographic Gravity Wave Drag
Publisher: American Meteorological Society
Abstract: A comparison is undertaken of the response of a general circulation model (GCM) to the nonorographic gravity wave drag parameterizations of Hines, Warner and McIntyre, and Alexander and Dunkerton. The analysis is restricted ...
The Variability of Modeled Tropical Precipitation
Publisher: American Meteorological Society
Abstract: This paper investigates the temporal properties of tropical precipitation in the Canadian Centre for Climate Modelling and Analysis (CCCma) third-generation atmospheric general circulation model (AGCM3). AGCM3 employs the ...
Self-Acceleration in the Parameterization of Orographic Gravity Wave Drag
Publisher: American Meteorological Society
Abstract: A new effect related to the evaluation of momentum deposition in conventional parameterizations of orographic gravity wave drag (GWD) is considered. The effect takes the form of an adjustment to the basic-state wind about ...
On Shear-Generated Gravity Waves that Reach the Mesosphere. Part I: Wave Generation
Publisher: American Meteorological Society
Abstract: A long unresolved issue in nonorographic gravity wave generation is whether there is significant emission from Kelvin?Helmholtz (KH) shear instability in the lower stratosphere, for instance, just above tropopause jets. ...
Simulating the QBO in an Atmospheric General Circulation Model: Sensitivity to Resolved and Parameterized Forcing
Publisher: American Meteorological Society
Abstract: he quasi-biennial oscillation (QBO) of tropical stratospheric zonal winds is simulated in an atmospheric general circulation model and its sensitivity to model parameters is explored. Vertical resolution in the lower ...
Influence of the Quasi-Biennial Oscillation on the Extratropical Winter Stratosphere in an Atmospheric General Circulation Model and in Reanalysis Data
Publisher: American Meteorological Society
Abstract: The interannual variability of the stratospheric polar vortex during winter in both hemispheres is observed to correlate strongly with the phase of the quasi-biennial oscillation (QBO) in tropical stratospheric winds. It ...
Sensitivity of Simulated Climate to Conservation of Momentum in Gravity Wave Drag Parameterization
Publisher: American Meteorological Society
Abstract: The Canadian Middle Atmosphere Model is used to examine the sensitivity of simulated climate to conservation of momentum in gravity wave drag parameterization. Momentum conservation requires that the parameterized gravity ...
Dynamical Control of the Mesosphere by Orographic and Nonorographic Gravity Wave Drag during the Extended Northern Winters of 2006 and 2009
Publisher: American Meteorological Society
Abstract: version of the Canadian Middle Atmosphere Model (CMAM) that is nudged toward reanalysis data up to 1 hPa is used to examine the impacts of parameterized orographic and nonorographic gravity wave drag (OGWD and NGWD) on the ...