Hydrographic variations in deep ocean temperature over the mid-Pleistocene transition

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doi: 10.1016/j.quascirev.2014.01.020
Author(s): Bates, Stephanie L.; Siddall, Mark; Waelbroeck, Claire
Author Affiliation(s): Primary:
University of Bristol, School of Earth Sciences, Bristol, United Kingdom
Other:
Institut Pierre Simon Laplace, France
Volume Title: Quaternary Science Reviews
Source: Quaternary Science Reviews, Vol.88, p.147-158. Publisher: Elsevier, International. ISSN: 0277-3791
Note: In English. 103 refs.; illus., incl. 2 tables, sketch map
Summary: During the mid-Pleistocene transition the dominant 41 ka periodicity of glacial cycles transitioned to a quasi-100 ka periodicity for reasons not yet known. This study investigates the potential role of deep ocean hydrography by examining oxygen isotope ratios in benthic foraminifera. Oxygen isotope records from the Atlantic, Pacific and Indian Ocean basins are separated into their ice volume and local temperature/hydrography components using a piece-wise linear transfer function and a temperature calibration. Although our method has certain limitations, the deep ocean hydrography reconstructions show that glacial deep ocean temperatures approached freezing point as the mid-Pleistocene transition progressed. Further analysis suggests that water mass reorganisation could have been responsible for these temperature changes, leading to such stable conditions in the deep ocean that some obliquity cycles were skipped until precessional forcing triggered deglaciation, creating the apparent quasi-100 ka pattern. This study supports previous work that suggests multiples of obliquity cycles dominate the quasi-100 ka glacial cycles with precession components driving deglaciations. Abstract Copyright (2014) Elsevier, B.V.
Year of Publication: 2014
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Atlantic Ocean; Cape Verde Rise; Cenozoic; Chatham Rise; Chemostratigraphy; Climate forcing; Cores; Cycles; DSDP Site 607; Data processing; Deep Sea Drilling Project; East Pacific; Equatorial Pacific; Fourier analysis; IPOD; Ice; Indian Ocean; Isotope ratios; Isotopes; Leg 108; Leg 121; Leg 138; Leg 162; Leg 177; Leg 181; Leg 184; Leg 94; Marine sediments; Mid-Atlantic Ridge; Middle Pleistocene; Ninetyeast Ridge; North Atlantic; North Pacific; Northeast Atlantic; Northeast Pacific; Northwest Pacific; O-18/O-16; ODP Site 1090; ODP Site 1123; ODP Site 1143; ODP Site 1148; ODP Site 659; ODP Site 758; ODP Site 849; ODP Site 980; ODP Site 981; Obliquity of the ecliptic; Ocean Drilling Program; Orbital forcing; Oxygen; Pacific Ocean; Paleo-oceanography; Paleotemperature; Pleistocene; Precession; Quaternary; Reconstruction; Rockall Bank; Sea ice; Sea-level changes; Sediments; South Atlantic; South China Sea; South Pacific; Stable isotopes; Transfer functions; West Pacific
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Record ID: 2015012689
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands