The time period for the run was from present to the year 2100. All flows are donor controlled with the exception of the atmosphere to ocean mixed layer interface and the atmosphere to land plant flow. The flows used for these cases are based on equations suggested by Bolin. The ocean CO2 absorption sensitivity is based on the atmospheric concentration in relation to the vapor pressure in the ocean layer. The relation between the atmosphere and the land plants is also sensitized to increases in CO2 given that higher CO2 concentrations enhance the growth of some plants.
Relations indicate direct flow interactions between the reservoirs shown in the diagram.
The fossil fuel contribution is designed based on a market controlled consumption rate with the peak consumption occurring after the year 2100. Initial anthropogenic production is set at 5.5 Gt Carbon per year. Within this model, reforestation is defined as the re-growth of forests into the areas previously cleared for farming. Recognized weaknesses with this model include the ocean circulation system. The IPCC accepted model of the ocean is an upwelling-diffusion model, not reservoir based.