David L. Williamson

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A new version of the Community Atmosphere Model (CAM) has been developed and released to the climate community. CAM Version 3 (CAM3) is an atmospheric general circulation model that includes the Community Land Model (CLM3), an optional slab ocean model, and a thermodynamic sea ice model. The dynamics and physics in CAM3 have been changed substantially(More)
A new version of the Community Atmosphere Model (CAM) has been developed and released to the climate community. CAM3 is an atmospheric general circulation model that includes the Community Land Model (CLM3), an optional slab-ocean model, and a thermodynamic sea-ice model. The dynamics and physics in CAM3 have been changed substantially compared to(More)
SUMMARY A deterministic initial-value test case for dry dynamical cores of atmospheric general-circulation models is presented that assesses the evolution of an idealized baroclinic wave in the northern hemisphere. The initial zonal state is quasi-realistic and completely defined by analytic expressions which are a steady-state solution of the adiabatic(More)
Cloud effects have repeatedly been pointed out as the leading source of uncertainty in projections of future climate, yet clouds remain poorly understood and simulated in climate models. Aquaplanets provide a simplified framework for comparing and understanding cloud effects, and how they are partitioned as a function of regime, in large-scale models. This(More)