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Earth’s climate history

Earth’s climate history. Cenozoic cooling. CaCO 3 is taken up by marine organisms. Foraminifer. Coccolithophorid. ... as is SiO 2. Radiolarian (SiO 2 ) (50 microns). Diatom (SiO 2 ) (50microns). Destination of atmospheric CO 2. Carbon reservoirs today. Inorganic carbon cycle.

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Earth’s climate history

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  1. Earth’s climate history

  2. Cenozoic cooling

  3. CaCO3 is taken up by marine organisms Foraminifer Coccolithophorid

  4. ... as is SiO2 Radiolarian (SiO2) (50 microns) Diatom (SiO2) (50microns)

  5. Destination of atmospheric CO2 Carbon reservoirs today

  6. Inorganic carbon cycle Carbon ends up here

  7. Volcanic eruptions main source of CO2

  8. BLAG model – spreading rates sometimes fast, sometimes slow

  9. Pre-Quaternary atmospheric CO2 levels cannot yet be directly determined. • Can be modeled from the carbon isotope record? • BLAG (Berner, Lasaga, Garrels) Model • Steady-State Flux Balance Equation • Fwc +Fmc + Fwg = Fbc + Fbg • w: weathering • m: metamorphism • b: burial • c: carbonate • g: organic

  10. Climate through Earth history

  11. Cenozoic cooling

  12. Spreading rates have decreased over last 65 million years

  13. Silicate rock weathering

  14. 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

  15. Tibetan plateau

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

  17. Climate through Earth history

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