Figure 12 - uploaded by Louis Derry
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Perturbations to ICBM-simulated dissolved oxygen profiles as a result of high-latitude nutrient drawdown for the 13-box model (red lines) and 79-box model (black lines). Profiles at t = 0 are the steady state results of previous standard simulations. At t = 0, the restriction on high-latitude nutrient drawdown is removed (previously set at 1.5 mM PO 4 3− ). (a-d) The release of nutrient limitation allows for a rapid increase in high-latitude export production and onset of high-latitude suboxia occurs within 100 years. (e-h) However, gyre profiles are only modestly perturbed. These results are similar to those found by previous workers using an early 3-D OGCM model [Sarmiento and Orr, 1991] and differ from early three-box models of ocean biogeochemistry which predicted complete anoxia of the deep ocean.
Source publication
Global marine redox conditions and marine nutrient status are tightly coupled on geologic timescales. Hypotheses that attempt to explain the occurrence of OAEs and/or the widespread deposition of organic-rich sediments must be dynamically plausible when viewed from the perspective of each of the major biological elements---C,N,P,O, and S. We presen...
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