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Limits on the organic storage of carbon from burning fossil fuels

Journal Article · · J. Environ. Manage.; (United States)
OSTI ID:6720416
Computer simulations of a global carbon model are used to explore the redistribution of carbon resulting from the burning of fossil fuel and the clearing of tropical forests. The model distinguishes 16 compartments. Three regions of wooded or non-wooded ecosystems, with rapidly and slowly exchanging pools of organic matter in each, constitute the terrestrial biosphere pools. The ocean is considered as a three-layered subsystem of inorganic carbon together with other organic reservoirs. A working hypothesis in the model assumes that increased atmospheric carbon dioxide would stimulate net primary production of terrestrial biota. However, physiological limiting factors and increase of forested area would reduce possible storage. With assumed constraints on growth of terrestrial ecosystems, the model is used to project limits on the sizes of rapidly and slowly exchanging pools of the three biospheric regions, and also on their exchange rates for carbon. Under optimistic assumptions, the simulations project a 16% increase of carbon storage in the biospheric organic pools as the plausible upper limit. Similarly, the exchange rate of carbon between the atmosphere and the entire terrestrial biosphere is projected to increase from a current estimated value of 56 Gtons/year to a maximum of 66 Gtons/year.
Research Organization:
Oak Ridge National Lab., TN
OSTI ID:
6720416
Journal Information:
J. Environ. Manage.; (United States), Journal Name: J. Environ. Manage.; (United States) Vol. 11:2; ISSN JEVMA
Country of Publication:
United States
Language:
English