A GLOBALLY AGGREGATED RECONSTRUCTION OF CYCLES OF CARBON AND ITS ISOTOPES

A globally aggregated model of the carbon cycle with an upwelling/diff usion ocean and a 6-box biosphere is developed to consistently reconst ruct the carbon cycle and isotopic variation in the atmosphere and oce ans. The calculated atmospheric delta(13)C trend, based on a model tha t reproduces the CO2 concentration record, agrees well with the observ ed ice core and tree-ring delta(13)C records. The model has also been used to estimate the delta(13)C of oceanic dissolved inorganic carbon, and our model results match observations well within the range of obs ervational uncertainty. This model is found to also match measured val ues (within measurement error) of the pre-bomb decrease in C-14 in the atmosphere and the mixed layer due to the Suess Effect the bomb-C-14 in the mixed layer, the bomb-C-14 penetration depth, the bomb-C-14 oce an inventory, and the vertical distribution of total dissolved carbon and C-14. In addition, the model is used to close the balance between the rates of increase of global inventory and of bomb production of ra diocarbon. Our confidence in both the global aggregation of data and o ur understanding of global carbon cycle is strengthened by the consist ency between carbon isotope concentration data and model results.