Sentences with phrase «initiate glaciation»

So it would seem a bit surprising if land use forcing were enough to itself initiate glaciation.

Given that a CO2 doubling or halving is equivalent to a 2 % change in solar irradiance [66] and the estimate that solar irradiance was approximately 6 % lower 600 Ma at the most recent snowball Earth occurrence [113], figure 7 implies that about 300 ppm CO2 or less was sufficiently small to initiate glaciation at that time.

High concentrations caused the warmth of the Cretaceous and Eocene worlds, and subsequent decreases (in combination with the other listed factors) initiated the glaciation of Antarctica.

Not exact matches

However, Kubatzki (2005) found that a simultaneous changes in the perihelion and obliquity forcing is necessary to initiate a full glaciation, while obliquity forcing alone or in combination with eccentricity forcing is not able to cause a glaciation.»

I.e., The glaciations were not initiated by CO2, but they were exacerbated by feedbacks that increased CO2.

(The modern view has glaciation initiated by cyclical orbital changes and amplified by a strong CO2 feedback.)