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)
This study examines the sensitivity of a number of important archetypical tracer problems to the numerical method used to solve the equations of tracer transport and atmospheric dynamics. The tracers' scenarios were constructed to exercise the model for a variety of problems relevant to understanding and modeling the physical, dynamical, and chemical(More)