Increased seasonality through the Eocene to Oligocene transition in northern high latitudes

@article{Eldrett2009IncreasedST,
  title={Increased seasonality through the Eocene to Oligocene transition in northern high latitudes},
  author={James S. Eldrett and David R. Greenwood and Ian C. Harding and Matthew Huber},
  journal={Nature},
  year={2009},
  volume={459},
  pages={969-973}
}
A profound global climate shift took place at the Eocene–Oligocene transition (∼33.5 million years ago) when Cretaceous/early Palaeogene greenhouse conditions gave way to icehouse conditions. During this interval, changes in the Earth’s orbit and a long-term drop in atmospheric carbon dioxide concentrations resulted in both the growth of Antarctic ice sheets to approximately their modern size and the appearance of Northern Hemisphere glacial ice. However, palaeoclimatic studies of this interval… 

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