TY - JOUR
T1 - Palaeoceanography of the Japan Sea Across the Mid-Pleistocene Transition
T2 - Insights From IODP Exp. 346, Site U1427
AU - Felder, Sonja
AU - Sagawa, Takuya
AU - Greaves, Mervyn
AU - Leng, Melanie J.
AU - Ikehara, Ken
AU - Kimoto, Katsunori
AU - Hasegawa, Siro
AU - Wagner, Thomas
AU - Henderson, Andrew C. G.
N1 - Funding Information:
This study used samples provided by the Integrated Ocean Drilling Program (IODP). We would like to thank the co-chiefs, Ryuji Tada and Richard W. Murray, and all IODP Expedition 346 participants, and two anonymous reviewers for their insights and tremendous efforts to improve this manuscript. This research was supported by a NERC IAPETUS Doctoral Training Partnership studentship (NE/L002590/1) and by a British Geological Survey CASE partnership (BUFI S270) and forms part of S. Felder's PhD research (?The mid-Pleistocene climate transition in the Japan Sea: Insights of a combined palaeoceanographic and -monsoon, multi-proxy study using marine sediments of IODP Site U1427 from the shallow, southern Japan Sea?, unpublished PhD thesis, Newcastle University, UK). Analyses were also supported by the National Environmental Isotope Facility at the British Geological Survey under awards IP-16668-111, IP-1486-1114 and IP-1668-1116, and by a research grant by the European Consortium for Ocean Research Drilling (ECORD) to undertake training and analysis in the Mg/Ca determination at the Godwin Laboratory, Cambridge. This work is also partly supported by JSPS Grant JPMXS05E2900001 and by Kanazawa University SAKIGAKE project 2020. We are grateful to UK IODP for supporting S. Felder in the participation in the Expedition 346 second post cruise meeting in Melbourne, Australia, and for A. C. G. Henderson in Expedition 346 (NE/L002655/1). We would also like to thank Dr Tracy Ace, University of Leeds, for making microscope facilities available as well as Christian M?rz and Eva for their continuous support and patience during the lead author's PhD and the writing this manuscript. Each named author has substantially contributed to conducting the underlying research and drafting this manuscript.
Funding Information:
This study used samples provided by the Integrated Ocean Drilling Program (IODP). We would like to thank the co‐chiefs, Ryuji Tada and Richard W. Murray, and all IODP Expedition 346 participants, and two anonymous reviewers for their insights and tremendous efforts to improve this manuscript. This research was supported by a NERC IAPETUS Doctoral Training Partnership studentship (NE/L002590/1) and by a British Geological Survey CASE partnership (BUFI S270) and forms part of S. Felder's PhD research (“The mid‐Pleistocene climate transition in the Japan Sea: Insights of a combined palaeoceanographic and ‐monsoon, multi‐proxy study using marine sediments of IODP Site U1427 from the shallow, southern Japan Sea”, unpublished PhD thesis, Newcastle University, UK). Analyses were also supported by the National Environmental Isotope Facility at the British Geological Survey under awards IP‐16668‐111, IP‐1486‐1114 and IP‐1668‐1116, and by a research grant by the European Consortium for Ocean Research Drilling (ECORD) to undertake training and analysis in the Mg/Ca determination at the Godwin Laboratory, Cambridge. This work is also partly supported by JSPS Grant JPMXS05E2900001 and by Kanazawa University SAKIGAKE project 2020. We are grateful to UK IODP for supporting S. Felder in the participation in the Expedition 346 second post cruise meeting in Melbourne, Australia, and for A. C. G. Henderson in Expedition 346 (NE/L002655/1). We would also like to thank Dr Tracy Ace, University of Leeds, for making microscope facilities available as well as Christian März and Eva for their continuous support and patience during the lead author's PhD and the writing this manuscript. Each named author has substantially contributed to conducting the underlying research and drafting this manuscript.
Publisher Copyright:
© 2021. The Authors.
PY - 2022/1
Y1 - 2022/1
N2 - 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.
AB - 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.
KW - IODP Exp. 346
KW - Japan Sea palaeoceanography across the mid-Pleistocene transition
KW - Japan Sea δO of seawater record
KW - Mg/Ca-temperature core-top calibration for Uvigerina
KW - Site U1427
KW - Uvigerina oxygen isotope and trace element (Mg/Ca) records
UR - http://www.scopus.com/inward/record.url?scp=85123760199&partnerID=8YFLogxK
U2 - 10.1029/2021PA004236
DO - 10.1029/2021PA004236
M3 - Article
AN - SCOPUS:85123760199
SN - 2572-4517
VL - 37
JO - Paleoceanography and Paleoclimatology
JF - Paleoceanography and Paleoclimatology
IS - 1
M1 - e2021PA004236
ER -
