Palaeoceanography of the Japan Sea Across the Mid‐Pleistocene Transition: Insights From IODP Exp. 346, Site U1427
Authors
Sagawa, Takuya
Hasegawa, Siro
Publication Date
2022-01Journal Title
Paleoceanography and Paleoclimatology
ISSN
2572-4517
Publisher
American Geophysical Union (AGU)
Volume
37
Issue
1
Language
en
Type
Article
This Version
AO
VoR
Metadata
Show full item recordCitation
Felder, S., Sagawa, T., Greaves, M., Leng, M. J., Ikehara, K., Kimoto, K., Hasegawa, S., et al. (2022). Palaeoceanography of the Japan Sea Across the Mid‐Pleistocene Transition: Insights From IODP Exp. 346, Site U1427. Paleoceanography and Paleoclimatology, 37 (1) https://doi.org/10.1029/2021pa004236
Abstract
Abstract: Large‐scale atmospheric circulation patterns, such as the East Asian monsoon, have been proposed as possible feedbacks of the mid‐Pleistocene transition (MPT). Marine sediments of the Japan Sea (JS) record variations in the East Asian monsoon over long timescales and may be crucial for understanding of the MPT. To interpret these sediments correctly an understanding of the JS palaeoceanography is necessary. So far, the JS palaeoceanography has been extrapolated across the MPT from studies of the most recent glacial‐interglacial cycles. These suggest a good connection and unrestricted water‐mass exchange with the open ocean during interglacial sea‐level highstands, while during glacial sea‐level lowstands the JS is nearly isolated. Glacial isolation often results in poor carbonate preservation and unusually low oxygen isotope (δ18O) ratios from low‐saline/low‐δ18O waters accumulating in the basin. Using the sediments of Integrated Ocean Drilling Program (IODP) Site U1427, a shallow‐water site in the southern JS, we present a continuous foraminiferal δ18O record encompassing the MPT. This record shows the JS‐typical low glacial δ18O values in the late phase of the MPT, across Marine Isotope Stages (MIS) 24‐17, while earlier MPT glacials, across MIS 39‐25, are characterized by high δ18O values. We propose that high glacial δ18O values are the result of an improved connection between the shallow, southern JS and adjacent ocean during early MPT glacials. The impact of this palaeoceanographic mode, if continued to deep‐water sites, would make the interpretation of dark/light sediment layers as glacial/interglacial deposits uncertain.
Keywords
Cenozoic Evolution of Mountains, Monsoons, and the Biosphere, BIOGEOSCIENCES, Isotopic composition and chemistry, Macro‐ and micropaleontology, Nutrients and nutrient cycling, Trace element cycling, GEOCHEMISTRY, Stable isotope geochemistry, Marine geochemistry, MARINE GEOLOGY AND GEOPHYSICS, Micropaleontology, OCEANOGRAPHY: GENERAL, Marginal and semi‐enclosed seas, OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL, Trace elements, Marine inorganic chemistry, Marine organic chemistry, Stable isotopes, PALEOCEANOGRAPHY, Research Article, IODP Exp. 346, Site U1427, Japan Sea palaeoceanography across the mid‐Pleistocene transition, Uvigerina oxygen isotope and trace element (Mg/Ca) records, Mg/Ca‐temperature core‐top calibration for Uvigerina, Japan Sea δ18O of seawater record
Sponsorship
NERC ‐ IAPETUS DTP (NE/L002590/1)
ECORD (European consoritum for ocean research drilling) Research Grant (n/a)
NERC NIGL (IP‐16668‐111, IP‐1486‐1114)
British Geological Survey CASE partnership (BUFI S270)
Japan Society for the Promotion of Science (JPMXS05E2900001)
Kanazawa University (SAKIGAKE project 2020)
Identifiers
palo21118, 2021pa004236
External DOI: https://doi.org/10.1029/2021pa004236
This record's URL: https://www.repository.cam.ac.uk/handle/1810/333006
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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