UA-MCM Description Summary
The Manabe Climate Model (MCM) was developed in the 1980s and 1990s by S. Manabe, R. Stouffer and collaborators at NOAA’s Geophysical Fluid Dynamics Laboratory. A lower resolution model version was first developed in the mid-1980s and used a 4.5° latitude grid spacing in the atmospheric and oceanic components. The higher resolution model presented here has a ~2.25° (150 km) horizontal resolution, which is slightly greater than, but roughly comparable to many of the climate and ESMs used in the fifth phase of the Coupled Model Intercomparison Project (CMIP5) (See Table 6.11 in Ciais et al. 2013). While the grid spacing is similar to CMIP5 models, particularly in the oceanic component, most of the physical subgrid-scale parameterizations in all components are in general much simpler. This enables the model to be very inexpensive in terms of present-day computer resources, allowing many studies of past climates to be performed economically. Despite its simplicity relative to other climate and ESMs currently in use, UA-MCM has been shown to perform very well relative to other more sophisticated and state-of-the-science CMIP6 models in climatically important regions such as the Southern Ocean (Beadling et al. 2020).