Millenial-Scale stable oxygen isotope record of ODP Site 172-1058 ...

• Main Authors: Weirauch, D, Billups, Katharina, Martin, Pamela
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2008
• Subjects: Ocean Drilling Program ODP; Ice Sheet; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.832407; https://doi.pangaea.de/10.1594/PANGAEA.832407

We use the oxygen isotopic composition of planktonic foraminifera Globigerinoides ruber (white) from Ocean Drilling Program Site 1058 in the subtropical northwestern Atlantic to construct a high-resolution (~800 year) climate record spanning the mid-Pleistocene climate transition (~410 ka to 1350 ka). We investigate whether or not millennial-scale instabilities in the proxy record are associated with the extent of continental glaciation. G. ruber d18O values display high-frequency fluctuations throughout the record, but the amplitude about mean glacial and interglacial d18O values increases at marine isotope stage (MIS) 22 (880 ka) and is highest during MIS 12. These observations support that millennial-scale climate instabilities are associated with ice sheet size. Time series analysis illustrates that these variations have significant concentration of spectral power centered on periods of ~10-12 ka and ~5 ka. The timing of these fluctuations agrees well, or coincides with, the periodicities of the second ... : Supplement to: Weirauch, D; Billups, Katharina; Martin, Pamela (2008): Evolution of millennial-scale climate variability during the mid-Pleistocene. Paleoceanography, 23(3), PA3216 ...