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Earth’s climate history. Cenozoic cooling CaCO 3 is taken up by marine organisms Coccolithophorid Foraminifer.

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Presentation on theme: "Earth’s climate history. Cenozoic cooling CaCO 3 is taken up by marine organisms Coccolithophorid Foraminifer."— Presentation transcript:

1 Earth’s climate history

2 Cenozoic cooling

3 CaCO 3 is taken up by marine organisms Coccolithophorid Foraminifer

4 ... as is SiO 2 Diatom (SiO 2 ) (50microns) Radiolarian (SiO 2 ) (50 microns)

5 Carbon reservoirs today Destination of atmospheric CO 2

6 Inorganic carbon cycle Carbon ends up here

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8 Volcanic eruptions main source of CO 2

9 BLAG model – spreading rates sometimes fast, sometimes slow

10 Pre-Quaternary atmospheric CO 2 levels cannot yet be directly determined. Can be modeled from the carbon isotope record? BLAG (Berner, Lasaga, Garrels) Model Steady-State Flux Balance Equation F wc +F mc + F wg = F bc + F bg w: weathering m: metamorphism b: burial c: carbonate g: organic

11 Climate through Earth history

12 Cenozoic cooling

13 Spreading rates have decreased over last 65 million years

14 Silicate rock weathering

15 Weathering rates increase over Cenozoic Does the amount of high elevation terrain result in unusual physical weathering? Most likely given 10 fold increase of sediment to the Indian Ocean – Steep terrain along southern Himalayan margin – Presence of powerful South Asian monsoon

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18 Tibetan plateau

19 Changes in amount of uplift of continental rock could regulate amount of weathering “Uplift weathering hypothesis” Uplift mainly when continents collide

20 Climate through Earth history

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