Title: Recent Results From Coupled Climate/Carbon-Cycle Models in CCSM3
Authors: Forrest Hoffman, Inez Fung, W. Mac Post, David Erickson
Abstract: Two terrestrial biogeochemistry modules (CN by Thornton and CASA' by Fung, et al.) have been coupled to the Community Land Model Version 3 (CLM3), the land component model contained in the Community Climate System Model Version 3 (CCSM3). A third terrestrial biogeochemistry module called IBIS (the Integrated Biosphere Simulator) by Foley, et al., has also been coupled to CCSM3 by Mirin, et al., and will be used to further explore land-atmosphere interactions specific to the global carbon cycle within the CCSM framework. A detailed model intercomparison project has been undertaken by the CCSM Biogeochemistry Working Group to elucidate the differences among these biogeochemistry modules in an effort to understand the terrestrial processes important to modeling the carbon cycle in a fully coupled Earth system model. It is expected that this project will result in a terrestrial model for use in future IPCC simulations. Presented will be early results from offline and partially coupled simulations of these terrestrial biogeochemistry modules with and without land cover change, fossil fuel emissions, and ocean carbon flux forcings over the 19th and 20th centuries.