1. Climate and Climate Change ATOC-230 Paleo-CO2
Bruno Tremblay
Atmospheric and Oceanic Sciences

2. Note: non-linear y-axis
Geological Time
Note: non-linear y-axis
Age of the Earth: 4500 million years

3. Atmospheric CO2
Concentrations
Keeling Curve
(instrumental record)

4. Back to the Early Miocene (20 Ma)
Today: 380 ppm

5. Almost Back to the Cretaceous (~ 65 million years)
Higher carbon
dioxide levels
than today ?
Today: 380 ppm

6. Phanerozoic Carbon Dioxide
New York Times, November 06, 2006:
In Ancient Fossils, Seeds of a New Debate on Warming

7. Ice Core Location
Vostok

8. Ice Core
 Same principles as for d18O

9. CO2 Record from Vostok Inter- glacial Glacial
Blue curve: proxy data for CO2 from air bubbles trapped in the EPICA ice core