A 150‐year variation of the Kuroshio transport inferred from coral nitrogen isotope signature

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  • Atsuko Yamazaki
    Faculty of Science Hokkaido University Sapporo Japan
  • Tsuyoshi Watanabe
    Faculty of Science Hokkaido University Sapporo Japan
  • Urumu Tsunogai
    Graduate School of Environmental Studies Nagoya University Chikusa‐ku Japan
  • Fumihito Iwase
    Biological Institute on Kuroshio, Kuroshio Biological Research Foundation Otsuki Japan
  • Hiroya Yamano
    Center for Environmental Biology and Ecosystem Studies National Institute for Environmental Studies Tsukuba Japan

書誌事項

公開日
2016-06
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2015pa002880
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>The Kuroshio Current is a major global ocean current that drives the physical ocean‐atmosphere system with heat transport from tropical to temperate zones in the North Pacific Ocean. We reconstructed the variability of the Kuroshio transport over the past 150 years using coral skeletal nitrogen isotopic composition (δ<jats:sup>15</jats:sup>N<jats:sub>coral</jats:sub>). A 150 year δ<jats:sup>15</jats:sup>N<jats:sub>coral</jats:sub> record (1859–2008 A.D.) is 4 times the length of the observational record (1971 to present) and could provide a direct comparison with global climate change, such as the Pacific Decadal Oscillation (PDO) index and El‐Niño–Southern Oscillation (ENSO), through recent global warming. Coral cores from <jats:italic>Porites</jats:italic> were collected from Tatsukushi Bay in 2008 on the Pacific coast of Japan, which is located on the northern front of the Kuroshio Current. δ<jats:sup>15</jats:sup>N<jats:sub>coral</jats:sub> was used as a proxy to record the δ<jats:sup>15</jats:sup>N of nitrate (δ<jats:sup>15</jats:sup>N<jats:sub>nitrate</jats:sub>) controlled by the upwelling of subtropical subsurface water (δ<jats:sup>15</jats:sup>N<jats:sub>nitrate</jats:sub>; ~ +2 − +3‰), and δ<jats:sup>15</jats:sup>N<jats:sub>coral</jats:sub> was negatively correlated with observations of the Kuroshio transport (<jats:italic>R</jats:italic> = −0.69, <jats:italic>P</jats:italic> < 0.001) and the 2 year lagged PDO index (<jats:italic>R</jats:italic> = −0.63, <jats:italic>P</jats:italic> < 0.005) from 1972 to 2007. The 150 year record of δ<jats:sup>15</jats:sup>N<jats:sub>coral</jats:sub> suggested that the Kuroshio transport varied with ~25 year cycle, and the amplitude became more stable, and the volume was intensified through the twentieth century. The Kuroshio transport was intensified by the La Niña state in the early 1900s and by the El Niño‐PDO state after the 1920s. Our results suggested that the Kuroshio transport was influenced by the combined climate modes of ENSO and PDO during the last century.</jats:p>

収録刊行物

  • Paleoceanography

    Paleoceanography 31 (6), 838-846, 2016-06

    American Geophysical Union (AGU)

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参考文献 (43)*注記

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