| PALEOCEANOGRAPHY |
Nordic Seas ice rafting during the Pliocene and Pleistocene
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Jansen, E., T. Fronval, F. Rack, and J.E.T. Channell. 2000. Pliocene-Pleistocene ice rafting history and cyclicity in the
Nordic Seas during the last 3.5 Myr. Paleoceanography 15(6):709-721.
| Data Coverage |
North: 69.25 * South: 69.25 |
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West: -12.7 * East: -12.7 |
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Altitude: -1800 m |
Data: Please Cite Data Contributors!
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Summary: A continuous 3.5 Myr IRD record was produced from Ocean Drilling Program (ODP) Site 907. A timescale based on magnetic polarity
chrons, oxygen isotope stratigraphy (for the last 1Myr) and orbital tuning was developed. The record documents a stepwise
inception of large-scale glacial cycles in the Nordic Seas region, the first being a marked expansion of the Greenland ice
sheet at 3.3 Ma. A second step occurred at 2.74 Ma by an expansion of large scale ice sheets in the Northern Hemisphere. Ice
sheet variability around the Nordic Seas was tightly coupled to global ice volume over the past 3.3 Myr. Between 3 and 1 Ma,
most of the variance of the IRD signal is in the 41 kyr band, whereas the last 1 Myr is characterized by stronger 100 kyr
variance. The Gamma Ray Porosity Evaluator (GRAPE) density record is closely linked with IRD variations and documents sub
orbital variability resembling the late Quaternary Heinrich/Bond cycles.
More Info on Paleoceanography Data |
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Parameters: Ice Rafted Debris (>150 micron) per gram
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Complete XML Record: noaa-ocean-2538
(Last Revised: 2007-12-21 )
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DOC/NOAA/NESDIS/NCDC (National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce )
325 Broadway, E/CC23
Boulder, CO 80305
USA
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| http://www.ncdc.noaa.gov/paleo/ |
| E-mail: bruce.a.bauer@noaa.gov |
| E-mail: paleo@noaa.gov |
Phone: 303-497-6280
Fax: 303-497-6513
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