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KMID : 1024519960050040429
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Journal of the Environmental Sciences
1996 Volume.5 No. 4 p.429 ~ p.440
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Global Carbon Cycle and Budget Study
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Kwon O-Yul
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Abstract
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A global carbon cycle model (GCCM), that incorporates interaction among the terrestrial biosphere, ocean, and atmosphere, was developed to study the carbon cycling aid global carbon budget, especially due to anthropogenic emission. The model that is based on C, 13C and 14C mass balance, was calibrated with the observed concentration, 13C and 14C in the atmosphere, Δ14C in the soil, and 14C in the ocean. Also, GCCM was constrained by the literature values of oceanic carbon uptake and CO, emissions from deforestation. Inputs (forcing functions in the model) were the C, 13C and 14C as emissions from fossil fuel use, and 14C injection into the stratosphere by bomb-tests. The simulated annual carbon budget of 1980s due to anthropoRenic shows that the global sources were 5.43 Gt-C/yr from fossil fuel use and 0.91 Gt-C/yr from deforestation, and the sinks were 3.29 Gt-C/yr in the atmosphere, 0.90 Gt-C/yr in the terrestrial biosphere and 2.15 Gt-C/yr in the ocean. The terrestrial biosphere is currently at zero net exchange with the atmosphere, but carbon is lost cia organic carbon runoff to the ocean. The model could be utilized for a variety of studies in policy and management, climate modeling, impacts, and crop models.
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KEYWORD
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cerbon cycle model, carbon budget, anthropogenic CO2
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