Biogeochemistry refers to the cycling of carbon and nitrogen through the plant / soil system and the interactions between these cycles as mediated by biological mechanisms of plants and soil heterotrophs. The model is fully prognostic with respect to all carbon and nitrogen state variables in the vegetation, litter, and soil organic matter as well as the seasonal timing of new vegetation growth and litterfall. The cycling of carbon is controlled by climate, land cover/land use, fire, atmospheric CO2 concentration, and nitrogen deposition ???. Biogenic volatile organic compound emissions from plants are also simulated.
The Community Earth System Model (CESM) is a fully-coupled, global climate model that provides state-of-the-art computer simulations of the Earth's past, present, and future climate states.
CESM is sponsored by the National Science Foundation (NSF) and the U.S. Department of Energy (DOE). Administration of the CESM is maintained by the Climate and Global Dynamics Laboratory (CGD) at the National Center for Atmospheric Research (NCAR).