The Formulation and Atmospheric Simulation of the Community Atmosphere Model: CAM3

摘要: A new version of the Community Atmosphere Model (CAM) has been developed and released to climate community. CAM3 is an atmospheric general circulation model that includes Land (CLM3), optional slab-ocean model, a thermodynamic sea-ice model. The dynamics physics in have changed substantially compared implementations previous versions. options for Eulerian spectral, semi-Lagrangian, finite volume formulations dynamical equations. It supports coupled simulations using either finite-volume or through explicit set adjustable parameters governing time step, cloud parameterizations, condensation processes. major modifications parameterizations moist processes, radiation aerosols. These changes improved several aspects simulated climate, including more realistic tropical tropopause temperatures, boreal winter land-surface surface insolation, clearsky polar regions. variation radiative forcing during ENSO events exhibits much better agreement with satellite observations. Despite these improvements, systematic biases reduce fidelity simulations. include underestimation variability, errors oceanic fluxes, implied ocean heat transport southern hemisphere, excessive stress storm tracks, offsets 500mb height field Aleutian low.