New insights into middle Eocene greenhouse climate stability from IODP Site U1333, Equatorial Pacific Ocean

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Author(s): Kordesch, Wendy E.; Palike, H.; Edgar, K. M.; Bohaty, S. M.; Wilson, Paul A.
Author Affiliation(s): Primary:
University of Southampton, National Oceanography Centre Southampton, Southampton, United Kingdom
University of Bremen, Germany
Cardiff University, United Kingdom
Volume Title: AGU 2012 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2012; American Geophysical Union 2012 fall meeting, San Francisco, CA, Dec. 3-7, 2012. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: Fundamental questions remain regarding the nature of climate dynamics during the Eocene epoch (55.8-33.9 million years ago, Ma). Recent studies suggest that geologically brief global warming events were more common than previously thought, and debate remains regarding the timing of the initiation and extent of continental ice-sheets at both poles in the Eocene. Research within the middle Eocene time interval has been particularly hindered by poor age control, recovery of stratigraphically discontinuous sediments, poor preservation of carbonate microfossils, and carbonate dissolution. New deep-sea drillcores recovered during Integrated Ocean Drilling Program (IODP) Expedition 320 in the equatorial Pacific Ocean provide stratigraphically continuous records with excellent age control and benthic foraminifers present throughout. In order to test the timing and magnitude of transient climate events, we have generated high-resolution (≈50 kyr) benthic foraminiferal stable isotope (δ18O and δ13C) and bulk sediment carbonate concentration records at IODP Site U1333 through a late middle Eocene time slice (≈42-39 Ma). These new records allow us to constrain changes in ocean temperature, continental ice volume, and the global carbon cycle during the middle Eocene.
Year of Publication: 2012
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Cenozoic; Climate change; Cores; East Pacific; Eocene; Expedition 320; Expeditions 320/321; Greenhouse effect; IODP Site U1333; Integrated Ocean Drilling Program; Marine sediments; Middle Eocene; North Pacific; Northeast Pacific; Pacific Ocean; Paleoclimatology; Paleogene; Sediments; Tertiary
Coordinates: N103100 N103100 W1382510 W1382510
Record ID: 2014044746
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