sculptor said:Climate simulations have difficulty in producing such a degree of warmth with the then greenhouse gas and orbital (Milankovitch) forcings alone, suggesting there must be some other factor at work, such as amplifying feedbacks.
The fact that the sheer amount of Arctic warming that occurred exceeds that simulated by climate models is both interesting and somewhat worrying
One possibility: Some of the discrepancy between models and proxy-based evaluations in deep time may be due to the influence of Oxygen levels - higher percentages of Oxygen are thought to have implied more actual atmosphere, higher atmospheric pressures, which reduce greenhouse gas effects. https://www.sciencemag.org/content/348/6240/1210.summary?related-urls=yes&legid=sci;348/6240/1210
http://www.sciencemag.org/content/348/6240/1238
Mechanism in lay terms: http://www.carbonbrief.org/blog/201...looked-factor-in-past-climate-study-suggests/
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