Earth’s climate history
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Transcript of Earth’s climate history
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Earth’s climate history
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Cenozoic cooling
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CaCO3 is taken up by marine organisms
CoccolithophoridForaminifer
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... as is SiO2
Diatom (SiO2) (50microns)Radiolarian (SiO2) (50 microns)
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Carbon reservoirs today
Destination of atmospheric CO2
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Inorganic carbon cycle
Carbon ends up here
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Volcanic eruptions main source of CO2
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BLAG model – spreading rates sometimes fast, sometimes slow
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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 EquationFwc +Fmc + Fwg = Fbc + Fbgw: weatheringm: metamorphismb: burialc: carbonateg: organic
Ocean andatmosphere
C
CarbonateC Organic
C5000
1250
2.9
Fwc Fwg
FbgFbcFmc Fmg
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Climate through Earth history
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Cenozoic cooling
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Spreading rates have decreased over last 65 million years
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Silicate rock weathering
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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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Tibetan plateau
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Changes in amount of uplift of continental rockcould regulate amount of weathering
“Upliftweatheringhypothesis”
Uplift mainlywhen continentscollide
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Climate through Earth history
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