HR: 1715h
AN: B24B-06
TI: Influence of dynamic land use and land cover change on simulated global terrestrial carbon and nitrogen cycles, climate-carbon cycle feedbacks, and interactions with rising CO2 and anthropogenic nitrogen deposition
AU: Thornton, P E
AF: Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States
AU: Hoffman, F
AF: Oak Ridge National Laboratory, Oak Ridge, TN, United States
AU: Hurtt, G C
AF: University of New Hampshire, Duram, NH, United States
AB: Previous work has demonstrated the sensitivity of terrestrial net carbon exchange to disturbance history and land use patterns at the scale of individual sites or regions. Here we show the influence of land use and land cover dynamics over the historical period 1850-present on global-scale carbon, nutrient, water, and energy fluxes. We also explore the spatial and temporal details of interactions among land use and disturbance history, rising atmospheric carbon dioxide consentation, and increasing anthropogenic nitrogen deposition. Our simulations show that these interactions are significant, and that their importance grows over time, expressed as a fraction of the independent forcing terms. We conclude with an analysis of the influence of these interactions on the sign and magnitude of global climate-carbon cycle feedbacks.
DE: [0414] BIOGEOSCIENCES / Biogeochemical cycles, processes, and modeling
DE: [0428] BIOGEOSCIENCES / Carbon cycling
DE: [0466] BIOGEOSCIENCES / Modeling
DE: [0469] BIOGEOSCIENCES / Nitrogen cycling
SC: Biogeosciences (B)
MN: 2009 Fall Meeting

Research partially sponsored by the Climate and Environmental Sciences Division (CESD) of the Office of Biological and Environmental Research (OBER), U.S. Department of Energy Office of Science (SC). This research used resources of the National Center for Computational Science (NCCS) at Oak Ridge National Laboratory (ORNL) which is managed by UT-Battelle, LLC, for the U.S. Department of Energy under Contract No. DE-AC05-00OR22725.