Atmospheric carbon dioxide concentrations over the past 60 million years

@article{Pearson2000AtmosphericCD,
  title={Atmospheric carbon dioxide concentrations over the past 60 million years},
  author={Paul N. Pearson and Martin R. Palmer},
  journal={Nature},
  year={2000},
  volume={406},
  pages={695-699}
}
Knowledge of the evolution of atmospheric carbon dioxide concentrations throughout the Earth's history is important for a reconstruction of the links between climate and radiative forcing of the Earth's surface temperatures. Although atmospheric carbon dioxide concentrations in the early Cenozoic era (about 60 Myr ago) are widely believed to have been higher than at present, there is disagreement regarding the exact carbon dioxide levels, the timing of the decline and the mechanisms that are… 
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References

SHOWING 1-10 OF 67 REFERENCES
Evidence for a higher pH in the glacial ocean from boron isotopes in foraminifera
RECORDS of past changes in the pH of the oceans should provide insights into how the carbonate chemistry of the oceans has changed over time. The latter is related to changes in the atmospheric CO2
Dissociation of oceanic methane hydrate as a cause of the carbon isotope excursion at the end of the Paleocene
Isotopic records across the “Latest Paleocene Thermal Maximum“ (LPTM) indicate that bottom water temperature increased by more than 4°C during a brief time interval (<104 years) of the latest
Foraminiferal boron isotope ratios as a proxy for surface ocean pH over the past 21 Myr
THE pH of the surface ocean is a sensitive function of its alkalinity and total inorganic carbon concentration, properties which also control the partial pressure of atmospheric carbon dioxide17.
The effect of silicate weathering on global temperature and atmospheric CO2
  • P. Brady
  • Environmental Science, Geology
  • 1991
Models of the carbon cycle, used to calculate atmospheric CO2 levels and mean global surface temperatures over geologic time, rely heavily on estimates of CO2 consumed by chemical weathering.
Sulfur isotopic composition of cenozoic seawater sulfate
TLDR
A comparison between seawater sulfate and marine carbonate carbon isotope records reveals no clear systematic coupling between the sulfur and carbon cycles over one to several millions of years, indicating that changes in the burial rate of pyrite sulfur and organic carbon did not singularly control the atmospheric oxygen content over short time intervals in the Cenozoic.
Miocene evolution of atmospheric carbon dioxide
Changes in pCO2 or ocean circulation are generally invoked to explain warm early Miocene climates and a rapid East Antarctic ice sheet (EAIS) expansion in the middle Miocene. This study reconstructs
Middle eocene seawater pH and atmospheric carbon dioxide concentrations
TLDR
Construction of a pH profile for the middle Eocene tropical Pacific Ocean shows that atmospheric pCO2 was probably similar to modern concentrations or slightly higher.
A study of the radiative effects of enhanced atmospheric CO2 and CH4 on early Earth surface temperatures
Large concentrations of atmospheric CO2 in the atmosphere of the early earth have been proposed as a possible explanation of the apparent absence of frozen earth in spite of a faint early sun.
Possible methane-induced polar warming in the early Eocene
TLDR
Estimates of Eocene wetland areas are considered and it is suggested that the flux of methane, an important greenhouse gas, may have been substantially greater during the Eocene than at present.
Thermodynamics of the carbon dioxide system in the oceans
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