Geo-Marine Letters

, Volume 28, Issue 3, pp 131-136

First online:

Evidence for the 8,200 a b.p. cooling event in the middle Okinawa Trough

  • Hua YuAffiliated withDepartment of Earth Sciences, Rice University Email author 
  • , Yingqian XiongAffiliated withDepartment of Geosciences, University of Houston
  • , Zhenxia LiuAffiliated withMarine Geology Division, The First Institute of Oceanography, SOA
  • , Serge BernéAffiliated withIFREMER, Géosciences Marines
  • , Chi-Yue HuangAffiliated withDepartment of Earth Science, National Cheng Kung University
  • , Guodong JiaAffiliated withGuangzhou Institute of Geochemistry, Chinese Academy of Sciences

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Based on new and existing data on oxygen isotopes, alkenone-surface seawater temperature trends, planktonic foraminifers, lithology, and clay mineral composition of piston cores, a distinct cooling event has been identified around 8,200 cal a b.p. in the middle Okinawa Trough, northwest Pacific. This corresponds to the 8,200 a b.p. cooling event recorded in many places of the Northern Hemisphere. During this event, the local temperature decreased by 1°C, and the δ18O value increased by 0.6‰. A strengthened Asian winter monsoon is the most probable cause for this event, which thus adds further credibility to the contention that we are dealing here with a global phenomenon.