Low-frequency Pliocene climate variability in the eastern Nordic Seas

Type Article
Date 2016-09
Language English
Author(s) Risebrobakken BjorgORCID1, Andersson Carin1, de Schepper StijnORCID1, McClymont Erin L.2
Affiliation(s) 1 : Bjerknes Ctr Climate Res, Uni Res Climate, Bergen, Norway.
2 : Univ Durham, Dept Geog, Durham, England.
Source Paleoceanography (0883-8305) (Amer Geophysical Union), 2016-09 , Vol. 31 , N. 9 , P. 1154-1175
DOI 10.1002/2015PA002918
WOS© Times Cited 11
Keyword(s) Pliocene, Nordic Seas, stable isotopes, diagenetic calcite, paleogeography, external and internal forcing

The Pliocene (5.3-2.6Ma) is often described as a relatively stable climatic period, with warm temperatures characterizing high latitudes. New suborbital resolved stable isotope records from Ocean Drilling Program 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 400,000years, are identified and characterized in the time interval 5.1-3.1Ma. 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 Northern Hemisphere glaciation 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. However, a strong and variable degree of diagenetic calcite overgrowth is documented for the planktic foraminifera, especially influencing the planktic O-18 results; the absolute values and amplitude of change cannot be taken at face value.

Full Text
File Pages Size Access
Publisher's official version 22 4 MB Open access
Top of the page