Uptake of excess CO/sub 2/ by an outcrop-diffusion model of the ocean
Uptake of excess CO/sub 2/ by an outcrop-diffusion model of the ocean A carbon cycle model is presented in which direct ventilation of intermediate and deep ocean waters in high latitudes is taken into account. The 1 1/2 -dimensional ocean model is an extension of a box-diffusion model including a deep-sea outcrop at the surface. If both are calibrated in a consistent way, the outcrop-diffusion ocean takes up more excess CO/sub 2/ than the box-diffusion ocean because the outcropping deep water is essentially virgin as to fossil CO/sub 2/. Two calibration methods are compared, using the distribution either of natural or of bomb-produced /sup 14/C. The latter leads to a higher oceanic uptake of excess CO/sub 2/ than the former and to a better agreement with the observed atmospheric increase. Long-term model responses are also discussed.
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