Marked decline in atmospheric carbon dioxide concentrations during the Paleogene.

@article{Pagani2005MarkedDI,
  title={Marked decline in atmospheric carbon dioxide concentrations during the Paleogene.},
  author={Mark Pagani and James C. Zachos and Katherine H. Freeman and Brett J Tipple and Stephen Bohaty},
  journal={Science},
  year={2005},
  volume={309 5734},
  pages={
          600-3
        }
}
The relation between the partial pressure of atmospheric carbon dioxide (pCO2) and Paleogene climate is poorly resolved. We used stable carbon isotopic values of di-unsaturated alkenones extracted from deep sea cores to reconstruct pCO2 from the middle Eocene to the late Oligocene (approximately 45 to 25 million years ago). Our results demonstrate that pCO2 ranged between 1000 to 1500 parts per million by volume in the middle to late Eocene, then decreased in several steps during the Oligocene… CONTINUE READING

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