Quote:
Originally Posted by grant hutchison
The story of high oxygen in the Cretaceous dates back to the 80s, with the work on amber bubbles which was subsequently discredited. It then revived with Bergman's COPSE model. But Berner's more recent GEOCARBSULF model (770kB pdf) suggests low levels of oxygen in the Cretaceous: down to the equivalent of 12% of our current atmospheric pressure, then rising to 18% towards the end.
Grant Hutchison |
thanks for the link,
Grant, though when I last studied it (the subject, not this paper), the O2 low point was in the
Triassic, ~100Myr ealier ...
oh yes - it's in the abstract:
Quote:
... a very sharp drop from 30% to 15% O2 at the Permo-Triassic boundary, and a more-or less continuous rise in O2
from the late Triassic to the present. (Berner, 2005)
|