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Diffusivity, Kinetic Energy Dissipation, and Closure Theories for the Poleward Eddy Heat Flux
Publisher: American Meteorological Society
Abstract: Diffusive eddy closure theory for estimating the poleward heat flux is reexamined and tested in the context of a two-layer homogeneous model. Consideration of the inverse energy cascade induced by baroclinic turbulence on ...
The Role of Moisture in the Dynamics and Energetics of Turbulent Baroclinic Eddies
Publisher: American Meteorological Society
Abstract: The effects of moisture on nonlinear baroclinic eddies are examined in the context of a horizontally homogeneous two-layer quasigeostrophic model. Using an explicit equation for moisture and a simple parameterization of ...
SST Forcings and Sahel Rainfall Variability in Simulations of the Twentieth and Twenty-First Centuries
Publisher: American Meteorological Society
Abstract: The outlook for Sahel precipitation in coupled simulations of the twenty-first century is very uncertain, with different models disagreeing even on the sign of the trends. Such disagreement is especially surprising in light ...
Parameterization of Quasigeostrophic Eddies in Primitive Equation Ocean Models
Publisher: American Meteorological Society
Abstract: A parameterization of mesoscale eddy fluxes in the ocean should be consistent with the fact that the ocean interior is nearly adiabatic. Gent and McWilliams have described a framework in which this can be approximated in ...
Resolving Convection in a Global Hypohydrostatic Model
Publisher: American Meteorological Society
Abstract: Convection cannot be explicitly resolved in general circulation models given their typical grid size of 50 km or larger. However, by multiplying the vertical acceleration in the equation of motion by a constant larger than ...
Assessment of Twentieth-Century Regional Surface Temperature Trends Using the GFDL CM2 Coupled Models
Publisher: American Meteorological Society
Abstract: Historical climate simulations of the period 1861?2000 using two new Geophysical Fluid Dynamics Laboratory (GFDL) global climate models (CM2.0 and CM2.1) are compared with observed surface temperatures. All-forcing runs ...
Radiative and Dynamical Feedbacks over the Equatorial Cold Tongue: Results from Nine Atmospheric GCMs
Publisher: American Meteorological Society
Abstract: The equatorial Pacific is a region with strong negative feedbacks. Yet coupled general circulation models (GCMs) have exhibited a propensity to develop a significant SST bias in that region, suggesting an unrealistic ...
Uncertainty in Model Climate Sensitivity Traced to Representations of Cumulus Precipitation Microphysics
Publisher: American Meteorological Society
Abstract: ncertainty in equilibrium climate sensitivity impedes accurate climate projections. While the intermodel spread is known to arise primarily from differences in cloud feedback, the exact processes responsible for the spread ...