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Low-frequency Pliocene climate variability in the eastern Nordic Seas

Risebrobakken, B.; Andersson, C.; De Schepper, S.; McClymont, E.L.

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Authors

B. Risebrobakken

C. Andersson

S. De Schepper



Abstract

The Pliocene (5.3–2.6 Ma) is often described as a relatively stable climatic period, with warm temperatures characterizing high latitudes. New suborbital resolved stable isotope records from ODP Hole 642B in the Eastern Nordic Seas document that the Pliocene was not a stable period characterized by one climate. Rather, seven distinct climate phases, each lasting between 150,000 and 400,000 years, are identified and characterized in the time interval 5.1–3.1 Ma. Four of the transitions between the defined climate phases occurred close to an eccentricity minimum and a minimum in amplitude of change for Northern Hemisphere summer insolation, while two occurred around an eccentricity maximum and a maximum in amplitude in insolation change. Hence, a low frequency response of the Nordic Seas to insolation forcing is indicated. In addition, paleogeographic and related paleoceanographic changes, expansion of the Arctic sea ice cover and onset of NHG were important factors behind the evolving Pliocene low frequency variability in the eastern Nordic Seas. It is likely that the identified climate phases and transitions are important beyond the Nordic Seas, due to their association with changes to both insolation and paleogeography. Also, a strong and variable degree of diagenetic calcite overgrowth is documented for the planktic foraminifera, especially influencing the planktic δ18O results; the absolute values and amplitude of change cannot be taken at face value.

Citation

Risebrobakken, B., Andersson, C., De Schepper, S., & McClymont, E. (2016). Low-frequency Pliocene climate variability in the eastern Nordic Seas. Paleoceanography, 31(9), 1154-1175. https://doi.org/10.1002/2015pa002918

Journal Article Type Article
Acceptance Date Jul 12, 2016
Online Publication Date Sep 17, 2016
Publication Date Sep 17, 2016
Deposit Date Aug 8, 2016
Publicly Available Date Mar 29, 2024
Journal Paleoceanography
Print ISSN 0883-8305
Electronic ISSN 1944-9186
Publisher American Geophysical Union
Peer Reviewed Peer Reviewed
Volume 31
Issue 9
Pages 1154-1175
DOI https://doi.org/10.1002/2015pa002918

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Published Journal Article (Advance online version) (4.8 Mb)
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Copyright Statement
Advance online version Risebrobakken, B., C. Andersson, S. De Schepper, and E. L. McClymont (2016), Low-frequency Pliocene climate variability in the eastern Nordic Seas, Paleoceanography, 31(9): 1154-1175, doi: 10.1002/2015PA002918. To view the published open abstract, go to http://dx.doi.org and enter the DOI.


Published Journal Article (Final published version) (4.8 Mb)
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Copyright Statement
Final published version





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