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Journal of Oceanography

, Volume 73, Issue 5, pp 647–667 | Cite as

Comparison of carbon cycle between the western Pacific subarctic and subtropical time-series stations: highlights of the K2S1 project

  • Makio C. Honda
  • Masahide Wakita
  • Kazuhiko Matsumoto
  • Tetsuichi Fujiki
  • Eko Siswanto
  • Kosei Sasaoka
  • Hajime Kawakami
  • Yoshihisa Mino
  • Chiho Sukigara
  • Minoru Kitamura
  • Yoshikazu Sasai
  • Sherwood L. Smith
  • Taketo Hashioka
  • Chisato Yoshikawa
  • Katsunori Kimoto
  • Shuichi Watanabe
  • Toru Kobari
  • Toshi Nagata
  • Koji Hamasaki
  • Ryo Kaneko
  • Mario Uchimiya
  • Hideki Fukuda
  • Osamu Abe
  • Toshiro Saino
Original Article

Abstract

A comparative study of ecosystems and biogeochemistry at time-series stations in the subarctic gyre (K2) and subtropical region (S1) of the western North Pacific Ocean (K2S1 project) was conducted between 2010 and 2013 to collect essential data about the ecosystem and biological pump in each area and to provide a baseline of information for predicting changes in biologically mediated material cycles in the future. From seasonal chemical and biological observations, general oceanographic settings were verified and annual carbon budgets at both stations were determined. Annual mean of phytoplankton biomass and primary productivity at the oligotrophic station S1 were comparable to that at the eutrophic station K2. Based on chemical/physical observations and numerical simulations, the likely “missing nutrient source” was suggested to include regeneration, meso-scale eddy driven upwelling, meteorological events, and eolian inputs in addition to winter vertical mixing. Time-series observation of carbonate chemistry revealed that ocean acidification (OA) was ongoing at both stations, and that the rate of OA was faster at S1 than at K2 although OA at K2 is more critical for calcifying organisms.

Keywords

Time-series stations K2 and S1 Western Pacific Primary productivity Carbon budget Missing source of nutrients Ocean acidification 

Notes

Acknowledgements

Owing to cooperative multidisciplinary research with scientists from various fields, a great synergy of effects was obtained. We acknowledge all of the scientists and students who participated in this project. During the K2S1 project cruises, sea conditions were not always calm. However, most of the scientific cruises and onboard observations were conducted successfully and safely with limited ship time. We appreciate the captains, ship crews, and marine technicians from the Global Ocean Development Incorporation (GODI) and Marine Works Japan Ltd (MWJ) for their dedicated and enthusiastic support. We deeply appreciate anonymous reviewers and guest editors of the K2S1 special issue including Drs. Joji Ishizaka, Hiroaki Saito and Eitarou Oka.

Supplementary material

10872_2017_423_MOESM1_ESM.doc (98 kb)
Supplementary material 1 (DOC 98 kb)

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Copyright information

© The Oceanographic Society of Japan and Springer Japan 2017

Authors and Affiliations

  • Makio C. Honda
    • 1
  • Masahide Wakita
    • 1
  • Kazuhiko Matsumoto
    • 1
  • Tetsuichi Fujiki
    • 1
  • Eko Siswanto
    • 1
  • Kosei Sasaoka
    • 1
  • Hajime Kawakami
    • 1
  • Yoshihisa Mino
    • 2
  • Chiho Sukigara
    • 2
  • Minoru Kitamura
    • 1
  • Yoshikazu Sasai
    • 1
  • Sherwood L. Smith
    • 1
  • Taketo Hashioka
    • 1
  • Chisato Yoshikawa
    • 1
  • Katsunori Kimoto
    • 1
  • Shuichi Watanabe
    • 1
  • Toru Kobari
    • 3
  • Toshi Nagata
    • 4
  • Koji Hamasaki
    • 4
  • Ryo Kaneko
    • 4
  • Mario Uchimiya
    • 5
  • Hideki Fukuda
    • 4
  • Osamu Abe
    • 2
  • Toshiro Saino
  1. 1.Japan Agency for Marine-Earth Science and TechnologyYokosukaJapan
  2. 2.Nagoya UniversityNagoyaJapan
  3. 3.Kagoshima UniversityKagoshimaJapan
  4. 4.The University of TokyoKashiwaJapan
  5. 5.RIKENYokohamaJapan

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