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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 ...
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Publisher: American Meteorological Society
Gravity Wave Refraction by Three-Dimensionally Varying Winds and the Global Transport of Angular Momentum
Publisher: American Meteorological Society
Abstract: Operational gravity wave parameterization schemes in GCMs are columnar; that is, they are based on a ray-tracing model for gravity wave propagation that neglects horizontal propagation as well as refraction by horizontally ...
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. ...
Improved Middle Atmosphere Climate and Forecasts in the ECMWF Model through a Nonorographic Gravity Wave Drag Parameterization
Publisher: American Meteorological Society
Abstract: In model cycle 35r3 (Cy35r3) of the ECMWF Integrated Forecast System (IFS), the momentum deposition from small-scale nonorographic gravity waves is parameterized by the Scinocca scheme, which uses hydrostatic nonrotational ...
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 ...