Risebrobakken, Bjørg; Andersson, Carin; De Schepper, Stijn; McClymont, Erin L (2016): Isotope measurements from ODP Hole 104-642B [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.863867, Supplement to: Risebrobakken, B et al. (2016): Low-frequency Pliocene climate variability in the eastern Nordic Seas. Paleoceanography, 31(9), 1154-1175, https://doi.org/10.1002/2015PA002918
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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 d18O results; the absolute values and amplitude of change cannot be taken at face value.
Related to:
Jansen, Eystein; Sjøholm, J; Bleil, Ulrich; Erichsen, JA (1990): Neogene and Pleistocene glaciations in the northern hemisphere and late Miocene - Pliocene global ice volume fluctuations: Evidence from the Norwegian Sea. In: Geological History of the Polar Oceans: Arctic Versus Antarctic, edited by U. Bleil and J. Thiede, Kluwer Academic Publishers, the Netherlands, 677-705
Coverage:
Latitude: 67.225000 * Longitude: 2.928300
Date/Time Start: 1985-06-28T14:40:00 * Date/Time End: 1985-06-29T20:15:00
Minimum DEPTH, sediment/rock: 66.87 m * Maximum DEPTH, sediment/rock: 83.61 m
Event(s):
104-642B * Latitude: 67.225000 * Longitude: 2.928300 * Date/Time Start: 1985-06-28T14:40:00 * Date/Time End: 1985-06-29T20:15:00 * Elevation: -1294.0 m * Penetration: 221.1 m * Recovery: 214.61 m * Location: Norwegian Sea * Campaign: Leg104 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 25 cores; 221.1 m cored; 0 m drilled; 97.1 % recovery
Parameter(s):
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6507 data points
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