Diachronous benthic δ18O responses during late Pleistocene terminations

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doi: 10.1029/2009PA001732
Author(s): Lisiecki, Lorraine E.; Raymo, Maureen E.
Author Affiliation(s): Primary:
University of California at Santa Barbara, Department of Earth Science, Santa Barbara, CA, United States
Other:
Boston University, United States
Volume Title: Paleoceanography
Source: Paleoceanography, 24(3). Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP
Note: In English. NSF grants OCE-0549222 and ATM-0455328. 39 refs.; illus., incl. 2 tables
Summary: Benthic δ18O is often used as a stratigraphic tool to place marine records on a common age model and as a proxy for the timing of ice volume/sea level change. However, Skinner and Shackleton (2005) found that the timing of benthic δ18O change at the last termination differed by 3900 years between one Atlantic site and one Pacific site. These results suggest that benthic δ18O change may not always accurately record the timing of deglaciation. We compare benthic δ18O records from 20 Atlantic sites and 14 Pacific sites to evaluate systematic differences in the timing of terminations in benthic δ18O. Analysis of sedimentation rates derived from the alignment of benthic δ18O suggests a statistically significant Atlantic lead over Pacific benthic δ18O change during the last six terminations. We estimate an average Pacific benthic δ18O lag of 1600 years for Terminations 1-5, slightly larger than the delay expected from ocean mixing rates given that most glacial meltwater probably enters the North Atlantic. We additionally find evidence of ∼4000-year Pacific δ18O lags at approximately 128 ka and 330 ka, suggesting that stratigraphic correlation of δ18O has the potential to generate age model errors of several thousand years during terminations. A simple model demonstrates that these lags can be generated by diachronous temperature changes and do not require slower circulation rates. Most importantly, diachronous benthic δ18O responses must be taken into account when comparing Atlantic and Pacific benthic δ18O records or when using benthic δ18O records as a proxy for the timing of ice volume change.
Year of Publication: 2009
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 24 Surficial Geology, Quaternary Geology; Atlantic Ocean; Benthic environment; Cape Basin; Cape Verde Rise; Caribbean Sea; Ceara Rise; Cenozoic; Chatham Rise; Chemostratigraphy; DSDP Site 502; DSDP Site 552; DSDP Site 607; Deep Sea Drilling Project; Deglaciation; East Pacific; Equatorial Atlantic; Equatorial Pacific; Gorda Rise; IPOD; Isotope ratios; Isotopes; Leg 108; Leg 111; Leg 130; Leg 138; Leg 154; Leg 162; Leg 167; Leg 177; Leg 181; Leg 184; Leg 68; Leg 81; Leg 94; Marine sedimentation; Marine sediments; Mid-Atlantic Ridge; North Atlantic; North Pacific; Northeast Atlantic; Northeast Pacific; Northwest Pacific; O-18/O-16; ODP Site 1012; ODP Site 1020; ODP Site 1089; ODP Site 1090; ODP Site 1123; ODP Site 1143; ODP Site 1146; ODP Site 658; ODP Site 659; ODP Site 664; ODP Site 677; ODP Site 806; ODP Site 846; ODP Site 849; ODP Site 925; ODP Site 926; ODP Site 927; ODP Site 928; ODP Site 929; ODP Site 980; ODP Site 982; ODP Site 983; ODP Site 984; Ocean Drilling Program; Ontong Java Plateau; Oxygen; Pacific Ocean; Paleoclimatology; Paleoenvironment; Pleistocene; Quaternary; Reykjanes Ridge; Rockall Bank; Rockall Plateau; Sedimentation; Sedimentation rates; Sediments; Sensitivity analysis; South Atlantic; South China Sea; South Pacific; Southeast Pacific; Stable isotopes; Statistical analysis; Uncertainty; Upper Pleistocene; West Pacific
Coordinates: N192724 N192724 E1161622 E1161622
N011203 N011209 W0834413 W0834414
N560233 N560234 W0231323 W0231324
N552906 N552906 W0144208 W0144208
Record ID: 2010081764
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