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Pliocene reversal of late Neogene aridification.

Sniderman, J M Kale, Woodhead, Jon D, Hellstrom, John, Jordan, Gregory J, Drysdale, Russell N, Tyler, J Jonathon and Porch, Nicholas 2016, Pliocene reversal of late Neogene aridification., Proceedings of the national academy of sciences of USA, vol. 113, no. 8, pp. 1999-2004, doi: 10.1073/pnas.1520188113.

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Title Pliocene reversal of late Neogene aridification.
Author(s) Sniderman, J M Kale
Woodhead, Jon D
Hellstrom, John
Jordan, Gregory J
Drysdale, Russell N
Tyler, J Jonathon
Porch, Nicholas
Journal name Proceedings of the national academy of sciences of USA
Volume number 113
Issue number 8
Start page 1999
End page 2004
Total pages 6
Publisher National Academy of Sciences
Place of publication Washington D.C., Wash.
Publication date 2016-02-23
ISSN 1091-6490
1091-6490
Keyword(s) Neogene
aridification
paleoclimate
pollen
speleothems
Summary The Pliocene epoch (5.3-2.6 Ma) represents the most recent geological interval in which global temperatures were several degrees warmer than today and is therefore considered our best analog for a future anthropogenic greenhouse world. However, our understanding of Pliocene climates is limited by poor age control on existing terrestrial climate archives, especially in the Southern Hemisphere, and by persistent disagreement between paleo-data and models concerning the magnitude of regional warming and/or wetting that occurred in response to increased greenhouse forcing. To address these problems, here we document the evolution of Southern Hemisphere hydroclimate from the latest Miocene to the middle Pliocene using radiometrically-dated fossil pollen records preserved in speleothems from semiarid southern Australia. These data reveal an abrupt onset of warm and wet climates early within the Pliocene, driving complete biome turnover. Pliocene warmth thus clearly represents a discrete interval which reversed a long-term trend of late Neogene cooling and aridification, rather than being simply the most recent period of greater-than-modern warmth within a continuously cooling trajectory. These findings demonstrate the importance of high-resolution chronologies to accompany paleoclimate data and also highlight the question of what initiated the sustained interval of Pliocene warmth.
Language eng
DOI 10.1073/pnas.1520188113
Field of Research 040104 Climate Change Processes
040308 Palaeontology (incl Palynology)
Socio Economic Objective 970104 Expanding Knowledge in the Earth Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, National Academy of Sciences
Persistent URL http://hdl.handle.net/10536/DRO/DU:30085334

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