Article thumbnail

A model of global and basin-scale anoxia

By J.R. Southam, W.H. Peterson and G.W. Brass


AbstractA simple steady-state 1-D model of the oceanic particulate organic carbon, dissolved oxygen and dissolved phosphate system has been developed to study global and basin-scale anoxia. The model has been calibrated with present-day data and yields estimates of the present-day new-carbon flux (0.65 mol C/yr m2) and riverine phosphate flux (0.43 × 10-4 mol P/yr m2). The model requires substantial departures from present-day conditions for the existence of global steady-state anoxia. Fertility well above present-day values is required (for present-day continental configurations) even with a substantial reduction in thermohaline circulation rates or ventilation. It is shown that small basins, such as the mid-Cretaceous North and South Atlantic, may attain steady-state anoxia with global fertility no greater than present-day values. Finally, it is suggested that large-scale anoxic events may be instrinsically transient phenomena and that modeling of the anoxic events recorded in the geologic record requires a 2-D time-dependent model

Publisher: Published by Elsevier B.V.
Year: 1987
DOI identifier: 10.1016/0270-0255(87)90521-5
OAI identifier:
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • https://s3-eu-west-1.amazonaws... (external link)
  • (external link)
  • Suggested articles

    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.