Mid-Holocene sea-surface temperature reconstruction using fossil corals from Kume Island, Ryukyu, Japan

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  • SEKI ARISA
    Atmosphere and Ocean Research Institute, The University of Tokyo Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo
  • YOKOYAMA YUSUKE
    Atmosphere and Ocean Research Institute, The University of Tokyo Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology
  • SUZUKI ATSUSHI
    Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST)
  • KAWAKUBO YUTA
    Atmosphere and Ocean Research Institute, The University of Tokyo Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo
  • OKAI TAKASHI
    Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST)
  • MIYAIRI YOSUKE
    Atmosphere and Ocean Research Institute, The University of Tokyo
  • MATSUZAKI HIROYUKI
    Department of Nuclear Engineering and Management, School of Engineering, The University of Tokyo
  • NAMIZAKI NAOKO
    Sesoko Station, Tropical Biosphere Research Center, University of the Ryukyus
  • KAN HIRONOBU
    Graduate School of Education, Okayama University Graduate School of Natural Sciences, Okayama University

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Abstract

The relative warmth and stability of the Holocene was punctuated by several brief cold events. Whereas these cold events on a global scale are widely reported, the lack of records from regions such as the East China Sea (ECS) results in an incomplete understanding of the underlying cooling mechanism. Here, we present a coral-based paleo-SST (sea-surface temperature) reconstruction from the ECS to constrain Holocene variability in the Kuroshio Western Boundary Current and the East Asian Monsoon (EAM). Our new data confirm that cold conditions prevailed at 3.8 cal kyr BP, which is consistent with the previously-reported Pulleniatina Minimum Event (PME). While this previous reconstruction could not reveal seasonal differences, our high-resolution data indicate a differing seasonal SST response between summer and winter. This result provides an important insight into understanding the mechanism of the millennium scale cold event in the ECS, the region affected by EAM.

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