The middle Cretaceous (120-90 million years ago) is substantially warmer than the present. The deep ocean temperature can reach up to 10-20 C. Therefore, the circulation could be totally different from the present state. Furthermore, the carbon cycle and atmospheric circulation could also be different. Any works on these issues?
Evidences show the increasing CO2 happened first due to the intensive volcanism eruption, then the temperature will rise for the greenhouse gas effect.
One thing needs to be noted here is the bathymetry then is totally different from now.
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