Emergence and evolution of millennial-scale variability in the East Asian summer monsoon over the last 3 Ma recorded in hemipelagic sediments of the Japan Sea recovered by IODP Expedition 346

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http://abstractsearch.agu.org/meetings/2016/FM/PP41E-03.html
Author(s): Tada, Ryuji; Irino, Tomohisa; Ikeda, Masayuki; Ikehara, Ken; Karasuda, Akinori; Lu, Song; Seki, Arisa; Sugisaki, Saiko; Itaki, Takuya; Sagawa, Takuya; Kubota, Yoshimi; Xuan, Chuang; Murray, Richard W.; Alvarez Zarikian, Carlos A.
Integrated Ocean Drilling Program, Expedition 346 Scientists, Tohyo
Author Affiliation(s): Primary:
University of Tokyo, Bunkyo-ku, Japan
Other:
Hokkaido University, Japan
Shizuoka University, Japan
Geological Survey of Japan, Japan
Kanazawa University, Japan
National Museum of Nature and Science, Japan
University of Southampton, United Kingdom
Boston University, United States
Integrated Ocean Drilling Program, United States
Volume Title: AGU 2016 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2016; American Geophysical Union 2016 fall meeting, San Francisco, CA, Dec. 12-16, 2016. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: It has been well established the East Asian summer monsoon (EASM) varied on millennial timescales associated with abrupt climatic changes in Greenland known as Dansgaard-Oeschger cycles (DOC). Variations in EASM intensity can now be traced back to 640 ka based on a stalagmite-derived δ18O record from South China (Cheng et al., 2016), but no high-resolution EASM records stretch beyond 640 ka. In contrast, millennial-scale oceanic variation has been traced back to 1.45 Ma in the North Atlantic on the Iberian Margin (Hodell et al., 2015), based on scanning XRF Ca/Ti ratios, and the Greenland temperature record has been extended back to 800 ka by the generation of a synthetic temperature record constructed based on the bipolar see-saw relationship between the Greenland and Antarctic temperatures recorded in ice cores (GLTsynhi; Baker et al., 2011). The hemipelagic sediments of the Japan Sea offer the potential to reconstruct milllennial-scale climate variability in the NW Pacific because it is characterized by centimeter- to decimeter-scale alternation of dark and light layers with dark (light) layers that correspond to DO interstadials (stadials) (Tada et al., 1999). The dark sediment color reflects Corg content, and deposition of dark layers results from nutrient influx through the southern strait modulated by Yangtze discharge, which reflects EASM precipitation in South China. IODP Exp. 346 drilled six sites in the deeper part of the Japan Sea, and recovered continuous pelagic sequences back to more than 3 Ma. Here, we present a basin-wide correlation of dark and light layers across all six sites back to 3 Ma. The first onset of alternating dark and light layers occurs at ∼2.6 Ma, but their occurrence is rather irregular. The occurrence becomes more frequent from ∼2.2 Ma, and then they occur in every glacial periods since ∼1.3 Ma. The temporal changes in amplitude and frequency, as well as detailed comparison with other high-resolution records will be presented.
Year of Publication: 2016
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Cenozoic; Cores; Expedition 346; Holocene; Integrated Ocean Drilling Program; Japan Sea; Marine sediments; North Pacific; Northwest Pacific; Pacific Ocean; Quaternary; Sediments; West Pacific
Coordinates: N313700 N434600 E1390500 E1285930
Record ID: 2017062452
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