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Deep-Sea Temperature and Ice Volume Changes Across the Pliocene-Pleistocene Climate Transitions |
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Deep-Sea Temperature and Ice Volume Changes Across the Pliocene-Pleistocene Climate Transitions
Science Vol. 325, pp. 306 - 310, 17 July 2009. DOI: 10.1126/science.1169938 Sindia Sosdian1 and Yair Rosenthal Institute of Marine and Coastal Science and Department of Earth and Planetary Sciences Rutgers University, New Brunswick, NJ 08901, USA 1Present address: Research School of Earth Sciences Australian National University, Canberra, ACT, 0200, Australia |
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ABSTRACT: Earth has undergone profound changes since the late Pliocene, which led to the development [~2.7 million years ago (Ma)] and intensification (~0.9 Ma) of large-scale Northern Hemisphere ice sheets, recorded as transitions in the benthic foraminiferal oxygen isotope (δ18Ob) record. Here we present an orbitally resolved record of deep ocean temperature derived from benthic foraminiferal magnesium/calcium ratios from the North Atlantic, which shows that temperature variations are a substantial portion of the global δ18Ob signal. The record shows two distinct cooling events associated with the late Pliocene (LPT, 2.5 to 3 Ma) and mid-Pleistocene (MPT, 1.2 to 0.85 Ma) climate transitions. Whereas the LPT increase in ice volume is attributed directly to global cooling, the shift to 100,000-year cycles at the MPT is more likely to be a response to an additional change in ice-sheet dynamics. |
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Download data from the WDC Paleo archive: North Atlantic Plio-Pleistocene Mg/Ca Temperature Reconstructions, Text or Excel format. |
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To read or view the full study, please visit the Science website. It was published in Science, Vol. 325, pp. 306 - 310, 17 July 2009. DOI: 10.1126/science.1169938 |
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http://www.ncdc.noaa.gov/paleo/pubs/sosdian2009/sosdian2009.html Downloaded Thursday, 01-Aug-2013 19:34:53 EDT Last Updated Friday, 24-Jul-2009 08:30:45 EDT by paleo@noaa.gov Please see the Paleoclimatology Contact Page or the NCDC Contact Page if you have questions or comments. |