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→Quantitative paleoclimate models
A quantitative community climate model (CCM<sub>1</sub>) at the National Center for Atmospheric Research was used by Amoco Production Research to investigate possible causes of [[Late Devonian]] extinctions. The results suggest two things:
A quantitative community climate model (CCM<sub>1</sub>) at the National Center for Atmospheric Research was used by Amoco Production Research to investigate possible causes of [[Late Devonian]] extinctions. The results suggest two things:
* There was no perennial snow cover and, hence, no glaciation in the austral regions.<ref name=ch17r69>Ormiston, A., R., Klapper, G., 1992, Paleoclimate, controls on Upper Devonian source rock sequences and stacked extinctions (abs.), in Lidgard, S., Crane, P., R., eds., Fifth North American Paleontological Convention Abstracts and Programs: Paleontological Society Special Publication 6, p. 227.</ref>
* There was no perennial snow cover and, hence, no glaciation in the austral regions.<ref name=ch17r69>Ormiston, A. R., and G. Klapper, 1992, Paleoclimate, controls on Upper Devonian source rock sequences and stacked extinctions (abs.), in S. Lidgard, and P. R. Crane, eds., Fifth North American Paleontological Convention Abstracts and Programs: Paleontological Society Special Publication 6, p. 227.</ref>
* Simulated sea-surface temperatures in the tropics ranged from [[temperature::27°C]] to [[temperature::34°C]]—high enough to kill reefs.<ref name=ch17r84>Thompson, J., Newton, C., 1989, Late Devonian mass extinction: episodic cooling or warming?, in McMillan, N., Embry, A., Glass, D., eds., Devonian of the World: Canadian Petroleum Society Memoir 14, vol. 3, p. 29–34.</ref>
* Simulated sea-surface temperatures in the tropics ranged from [[temperature::27°C]] to [[temperature::34°C]]—high enough to kill reefs.<ref name=ch17r84>Thompson, J., and C. Newton, 1989, Late Devonian mass extinction: episodic cooling or warming?, in N. McMillan, A. Embry, and D. Glass, eds., Devonian of the World: Canadian Petroleum Society Memoir 14, vol. 3, p. 29–34.</ref>
These results support a climatic cause for the extinctions.
These results support a climatic cause for the extinctions.