Changes in deep Pacific temperature during the mid-Pleistocene transition and Quaternary

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doi: 10.1016/j.quascirev.2009.05.011
Author(s): Siddall, Mark; Honisch, Barbel; Waelbroeck, Claire; Huybers, Peter
Author Affiliation(s): Primary:
University of Bristol, Department of Earth Sciences, Bristol, United Kingdom
Other:
Université de Versailles Saint-Quentin-en-Yvelines, France
British Antarctic Survey, United Kingdom
Lamont-Doherty Earth Observatory, United States
Harvard University, United States
Volume Title: Climate of the last million years; new insights from EPICA and other records
Volume Author(s): Fischer, Hubertus, editor; Masson-Delmotte, Valérie; Waelbroeck, Claire; Wolff, Eric W.
Source: Quaternary Science Reviews, 29(1-2), p.170-181; EPICA open science conference; Quaternary climate, from pole to pole, Venice, Italy, Nov. 10-13, 2008, edited by Hubertus Fischer, Valérie Masson-Delmotte, Claire Waelbroeck and Eric W. Wolff. Publisher: Elsevier, International. ISSN: 0277-3791
Note: In English. 78 refs.; illus., incl. 1 table
Summary: An attempt is made to unravel the dual influences of seawater temperature and isotopic composition upon the oxygen-isotope records of benthic foraminifers from the deep Pacific (δ18Ob). Our approach is to estimate a non-linear transfer function between past sea level and δ18Ob over the last two glacial cycles, with additional information from the mid-Pliocene. Combining this transfer function with the relationship between temperature and δ18Ob permits a deconvolution of a δ18Ob record from the deep Pacific into its temperature and sea-level constituents over the course of the Plio-Pleistocene. This deconvolution indicates that deep Pacific temperature is stable through much of the last glacial (MISs 4 through 2) and then increases by approximately 2°C during the last deglaciation. This pattern of variability appears to generally be replicated every glacial cycle back to the mid-Pliocene, suggesting a pulse of warming in the deep Pacific on a ∼100 kyr time scale during the late Pleistocene. Thus, according to this partition, there is more ∼100 kyr variability in temperature than in ice variability. Spectral analysis reveals that this variability is likely the product of multiple obliquity cycles rather than a simple 100-kyr signal. The non-linear behaviour of deep ocean temperature, dominated by pulses at 100 kyr time scales, may identify it as a key player in governing the glacial cycles. Abstract Copyright (2010) Elsevier, B.V.
Year of Publication: 2010
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 24 Surficial Geology, Quaternary Geology; Benthic taxa; Cenozoic; Deep-sea environment; East Pacific; Equatorial Pacific; Foraminifera; Invertebrata; Isotope ratios; Isotopes; Leg 111; Leg 138; Marine environment; Microfossils; Middle Pliocene; Neogene; North Pacific; Northeast Pacific; O-18/O-16; ODP Site 677; ODP Site 846; Ocean Drilling Program; Oxygen; Pacific Ocean; Paleoclimatology; Paleoenvironment; Paleotemperature; Pleistocene; Pliocene; Protista; Quaternary; Sea-level changes; South Pacific; Southeast Pacific; Stable isotopes; Tertiary; Transfer functions
Coordinates: S030549 S030541 W0904904 W0904906
N011203 N011209 W0834413 W0834414
S003230 S003230 W0833100 W0833100
Record ID: 2012050484
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands