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Could the Late Permian deep ocean have been anoxic?

Zhang, R. and Follows, M. J. and Grotzinger, J. P. and Marshall, J. (2001) Could the Late Permian deep ocean have been anoxic? Paleoceanography, 16 (3). pp. 317-329. ISSN 0883-8305. doi:10.1029/2000PA000522.

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Models of ocean circulation and biogeochemical cycles are used to speculate about possible mechanisms of deep-sea anoxia across the Permo-Triassic boundary. Two modes of likely Late Permian ocean thermohaline circulation are identified: a vigorous “thermal mode” driven by cooling in southern polar latitudes and a weaker “haline mode” driven by evaporation from the subtropics. We find that the thermal mode, typical of climates such as our own, is unlikely to surpport deep-sea anoxia. The haline mode, which might exist in warm climates with enhanced hydrological cycles, can lead to significant but periodic depletion of oxygen in the Panthalassic deep ocean. However, owing to the inherent instability of the haline mode, a deep-sea anoxia persisting for millions of years is not clearly supported by this study, though mechanisms emerge which might be consistent with the observed record. The enhanced hydrological cycle (or reduced oceanic diapycnal mixing) required to obtain the haline mode remain unconstrained for the Late Permian.

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Grotzinger, J. P.0000-0001-9324-1257
Additional Information:© 2001 by the American Geophysical Union. Paper number 2000PA000522. We thank D. B. Rowley for providing us with his topographic reconstructions of the Late Permian. Discussions with John Edmond, Ed Boyle, Jochem Marotzke, and Carl Wunsch were very helpful. The numerical calculations were carried out on Pleaides, a cluster of workstations donated by Compaq-Digital housed in MIT's Laboratory for Computer Science. This work was supported by NSF grant OCE-964331.
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Official Citation:Zhang, R., M. J. Follows, J. P. Grotzinger, and J. Marshall (2001), Could the Late Permian deep ocean have been anoxic?, Paleoceanography, 16(3), 317–329, doi:10.1029/2000PA000522
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50320
Deposited By: Tony Diaz
Deposited On:09 Oct 2014 22:51
Last Modified:10 Nov 2021 18:54

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