Fifty years of the 137°E repeat hydrographic section in the western North Pacific Ocean

Eitarou Oka, Masao Ishii, Toshiya Nakano, Toshio Suga, Shinya Kouketsu, Masatoshi Miyamoto, Hideyuki Nakano, Bo Qiu, Shusaku Sugimoto, Yusuke Takatani

Research output: Contribution to journalReview articlepeer-review

32 Citations (Scopus)


The 137°E repeat hydrographic section of the Japan Meteorological Agency across the western North Pacific was initiated in 1967 as part of the Cooperative Study of the Kuroshio and Adjacent Regions and has been continued biannually in winter and summer. The publicly available data from the section have been widely used to reveal seasonal to decadal variations and long-term changes of currents and water masses, biogeochemical and biological properties, and marine pollutants in relation to climate variability such as the El Niño-Southern Oscillation and the Pacific Decadal Oscillation. In commemoration of the 50th anniversary in 2016, this review summarizes the history and scientific achievements of the 137°E section during 1967–2016. Through the publication of more than 100 papers over this 50-year span, with the frequency and significance of the publication increasing in time, the 137°E section has demonstrated its importance for future investigations of physical–biogeochemical–biological interactions on various spatiotemporal scales, and thereby its utility in enhancing process understanding to aid projections of the impact of future climate change on ocean resources and ecosystems over the twenty-first century.

Original languageEnglish
Pages (from-to)115-145
Number of pages31
JournalJournal of Oceanography
Issue number2
Publication statusPublished - 2018 Apr 1


  • 137°E section
  • Biogeochemical oceanography
  • Biological oceanography
  • Long-term change
  • Marine pollution
  • Physical oceanography
  • Repeat hydrography
  • Seasonal to decadal variability
  • Western North Pacific

ASJC Scopus subject areas

  • Oceanography


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