Site U1302–U1308 methods

Channell, J. E. T.; Kanamatsu, Toshiya; Sato, T.; Stein, Rüdiger; Zarikian, C.A. Alvarez; Malone, Mitchell J

doi:10.2204/iodp.proc.303306.102.2006

Cited by 5 publications

(12 citation statements)

References 65 publications

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“…11). These records suggest that an increase in glacial ice volume across the MPT occurred abruptly at 900 ka during MIS 22, 23, and 24 (Berger, 1993Berger and Jansen, 1994;Elderfield et al, 2012).…”

Section: 11mentioning

confidence: 86%

“…A lesser known transition occurred in the middle Pleistocene near 1.6 to 1.5 Ma (Rutherford and D'Hondt, 2000;Hodell and Venz, 2006;Lisiecki, 2014). The onset and end of the MPT have been variably placed between 1.25 and 0.65 Ma (Clark et al, 2006), with an abrupt shift at 0.9 Ma in some records (Elderfield et al, 2012). These transitions represent times of fundamental reorganization of the climate system, and may mark bifurcation points in a dynamic climate system characterized by multiple stable states (Ditlevsen, 2009).…”

Section: Discussionmentioning

confidence: 99%

“…The 900 ka event Elderfield et al (2012) deconvolved the benthic δ 18 O record at Site 1123 in the SW Pacific into its temperature and δ 18 O water components by tandem measurement of Mg / Ca and δ 18 O in benthic foraminifera. They inferred a steplike increase in glacial ice volume at ∼ 900 ka.…”

Section: 11mentioning

confidence: 99%

“…The MIS 21-24 interval constitutes a lengthy glacial because MIS 23 was a weak interglacial and the MIS 24-23 transition is not considered to be a full termination (much like the MIS 4-3 transition). Elderfield et al (2012) proposed that the ice-volume increase during MIS 22-24 may have occurred on Antarctica in response to weak insolation during MIS 23 that suppressed substantial melting of the ice formed in MIS 24. Sea level lowering during MIS 22-24 may have also permitted the advance of marine-based ice sheets onto the continental shelves in the Northern Hemisphere.…”

Section: 11mentioning

confidence: 99%

“…At Site U1308, there are two decreases in bulk carbonate δ 18 O dur-fig11 Figure 11. Comparison of the deconvolved oxygen isotope signal of seawater (δ 18 O water ) from ODP Site 1123 (red; Elderfield et al, 2012) and the δ 18 O record of the shallow-dwelling Globigerinoides sacculifer from Site 806 on the Ontong Java Plateau (gray; Berger et al, 1993. Note the abrupt increase in δ 18 O of glacial stages following 900 ka after MIS 22.…”

Section: 11mentioning

confidence: 99%

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Mode transitions in Northern Hemisphere glaciation: co-evolution of millennial and orbital variability in Quaternary climate

2016

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We present a 3.2 Myr record of stable isotopes and physical properties at IODP Site U1308 (reoccupation of DSDP Site 609) located within the ice-rafted detritus (IRD) belt of the North Atlantic. We compare the isotope and lithological proxies at Site U1308 with other North Atlantic records (e.g., sites 982, 607/U1313, and U1304) to reconstruct the history of orbital and millennial-scale climate variability during the Quaternary. The Site U1308 record documents a progressive increase in the intensity of Northern Hemisphere glacial-interglacial cycles during the late Pliocene and Quaternary, with mode transitions at ∼ 2.7, 1.5, 0.9, and 0.65 Ma. These transitions mark times of change in the growth and stability of Northern Hemisphere ice sheets. They also coincide with increases in vertical carbon isotope gradients between the intermediate and deep ocean, suggesting changes in deep carbon storage and atmospheric CO 2 . Orbital and millennial climate variability co-evolved during the Quaternary such that the trend towards larger and thicker ice sheets was accompanied by changes in the style, frequency, and intensity of millennial-scale variability. This coevolution may be important for explaining the observed patterns of Quaternary climate change.

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Section: 11mentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Section: 11mentioning

confidence: 99%

Section: 11mentioning

confidence: 99%

Section: 11mentioning

confidence: 99%

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Mode transitions in Northern Hemisphere glaciation: co-evolution of millennial and orbital variability in Quaternary climate

2016

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Methods

2013

Proceedings of the IODP

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Data report: stratigraphic correlation of Site U1396 and creation of a composite depth scale and splice

Hatfield¹

2015

Proceedings of the IODP

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Composite depth scales and spliced records are routinely generated stratigraphic data sets on paleoceanographic Integrated Ocean Drilling Program (IODP) expeditions. They are constructed to generate a complete stratigraphic section that is more representative of a site than records from individual holes. Although sediments recovered from the three holes cored at Site U1396 during IODP Expedition 340 were correlated on board the JOIDES Resolution, a composite depth scale and complete stratigraphic section were not generated. After correction of the shipboard data for small positional errors, I used the shipboard acquired physical property data sets to recorrelate the stratigraphy and generate both a composite depth scale and a spliced record for Site U1396. Using the shipboard-generated paleomagnetic reversal record, I then estimated sedimentation rate at Site U1396 since ~4.5 Ma.

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Site U1302–U1308 methods

Cited by 5 publications

References 65 publications

Mode transitions in Northern Hemisphere glaciation: co-evolution of millennial and orbital variability in Quaternary climate

Mode transitions in Northern Hemisphere glaciation: co-evolution of millennial and orbital variability in Quaternary climate

Methods

Data report: stratigraphic correlation of Site U1396 and creation of a composite depth scale and splice

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