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RISThe Effect of Orographically Excited Gravity Wave Drag on the General Circulation of the Lower Stratosphere and Troposphere
Publisher: American Meteorological Society
Abstract: The influence of large-scale momentum sinks, due to breaking of orographically excited gravity waves, on the Northern Hemisphere wintertime circulation of the troposphere and lower stratosphere is examined by introducing ...
A New Second-Order Turbulence Closure Scheme for the Planetary Boundary Layer
Publisher: American Meteorological Society
Abstract: A new turbulence formulation for the planetary boundary layer (PBL) is presented and compared with large-eddy simulations (LES) for the dry PBL. The new scheme contains a prognostic equation for the turbulent kinetic energy. ...
Interactions between Orographic Gravity Wave Drag and Forced Stationary Planetary Waves in the Winter Northern Hemisphere Middle Atmosphere
Publisher: American Meteorological Society
Abstract: A quasigeostrophic model is used to study the combined interaction among orographically generated gravity wave drag, forced planetary waves, and zonal mean flows in the Northern Hemisphere winter stratosphere and mesosphere. ...
The Potential Vorticity Budget of an Atmospheric General Circulation Model
Publisher: American Meteorological Society
Abstract: The flux form of the potential vorticity (PV) equation in isentropic coordinates is used to examine the effects of advection and the effects of parameterized mechanical and thermal forcing on the PV budget of the second ...
Greenhouse Gas–induced Climate Change Simulated with the CCC Second-Generation General Circulation Model
Publisher: American Meteorological Society
Abstract: The Canadian Climate Centre second-generation atmospheric general circulation model coupled to a mixed-layer ocean incorporating thermodynamic sea ice is used to simulate the equilibrium climate response to a doubling of ...
Fluctuation of Mass Flux in a Cloud-Resolving Simulation with Interactive Radiation
Publisher: American Meteorological Society
Abstract: It was shown by Craig and Cohen that fluctuations of cumulus clouds under homogeneous large-scale forcing satisfy the Gibbs canonical ensemble in a strict radiative?convective equilibrium (RCE). In the limit of random ...
Simulations of Mid-Holocene Climate Using an Atmospheric General Circulation Model
Publisher: American Meteorological Society
Abstract: The authors describe a first paleoclimatological application of the Canadian Centre for Climate Modelling and Analysis atmospheric general circulation model (AGCM) to simulate the climate state 6000 calendar years before ...
The Canadian Climate Centre Second-Generation General Circulation Model and Its Equilibrium Climate
Publisher: American Meteorological Society
Abstract: The Canadian Climate Centre second generation general circulation model (GCMII) is described. The description emphasizes aspects in which the new model differs from the 1984 model (GCMI) as described by Boer and collaborators. ...
Ocean Surface Albedo and Its Impact on Radiation Balance in Climate Models
Publisher: American Meteorological Society
Abstract: An analysis of several ocean surface albedo (OSA) schemes is undertaken through offline comparisons and through application in the Canadian Centre for Climate Modelling and Analysis (CCCma) fourth-generation atmospheric ...