Global cooling during the Eocene-Oligocene climate transition

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doi: 10.1126/science.1166368
Author(s): Liu, Zhonghui; Pagani, Mark; Zinniker, David; DeConto, Robert; Huber, Matthew; Brinkhuis, Henk; Shah, Sunita R.; Leckie, R. Mark; Pearson, Ann
Author Affiliation(s): Primary:
Yale University, Department of Geology and Geophysics, New Haven, CT, United States
Other:
University of Massachusetts-Amherst, United States
Purdue University, United States
Utrecht University, Netherlands
Harvard University, United States
Volume Title: Science
Source: Science, 323(5918), p.1187-1190. Publisher: American Association for the Advancement of Science, Washington, DC, United States. ISSN: 0036-8075 CODEN: SCIEAS
Note: In English. 35 refs.; illus., incl. sketch map
Summary: About 34 million years ago, Earth's climate shifted from a relatively ice-free world to one with glacial conditions on Antarctica characterized by substantial ice sheets. How Earth's temperature changed during this climate transition remains poorly understood, and evidence for Northern Hemisphere polar ice is controversial. Here, we report proxy records of sea surface temperatures from multiple ocean localities and show that the high-latitude temperature decrease was substantial and heterogeneous. High-latitude (45 degrees to 70 degrees in both hemispheres) temperatures before the climate transition were ∼20°C and cooled an average of ∼5°C. Our results, combined with ocean and ice-sheet model simulations and benthic oxygen isotope records, indicate that Northern Hemisphere glaciation was not required to accommodate the magnitude of continental ice growth during this time.
Year of Publication: 2009
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Alkaline earth metals; Calcium; Cenozoic; Climate change; Cooling; Cores; Deep Sea Drilling Project; Eocene; Foraminifera; Global; Global change; Invertebrata; Isotope ratios; Isotopes; Magnesium; Metals; Mg/Ca; Microfossils; O-18/O-16; Ocean Drilling Program; Oligocene; Oxygen; Paleoclimatology; Paleogene; Protista; Reconstruction; Sea-surface temperature; Stable isotopes; Tertiary; World ocean
Record ID: 2009040970
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.

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