論文

査読有り 最終著者 国際誌
2020年5月27日

Subpolar marginal seas fuel the North Pacific through the intermediate water at the termination of the global ocean circulation

Proceedings of the National Academy of Sciences
  • Jun Nishioka
  • ,
  • Hajime Obata
  • ,
  • Hiroshi Ogawa
  • ,
  • Kazuya Ono
  • ,
  • Youhei Yamashita
  • ,
  • Keunjong Lee
  • ,
  • Shigenobu Takeda
  • ,
  • Ichiro Yasuda

117
23
開始ページ
12665
終了ページ
12673
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1073/pnas.2000658117
出版者・発行元
Proceedings of the National Academy of Sciences

The mechanism by which nutrients in the deep ocean are uplifted to maintain nutrient-rich surface waters in the subarctic Pacific has not been properly described. The iron (Fe) supply processes that control biological production in the nutrient-rich waters are also still under debate. Here, we report the processes that determine the chemical properties of intermediate water and the uplift of Fe and nutrients to the main thermocline, which eventually maintains surface biological productivity. Extremely nutrient-rich water is pooled in intermediate water (26.8 to 27.6 σ θ ) in the western subarctic area, especially in the Bering Sea basin. Increases of two to four orders in the upward turbulent fluxes of nutrients were observed around the marginal sea island chains, indicating that nutrients are uplifted to the surface and are returned to the subarctic intermediate nutrient pool as sinking particles through the biological production and microbial degradation of organic substances. This nutrient circulation coupled with the dissolved Fe in upper-intermediate water (26.6 to 27.0 σ θ ) derived from the Okhotsk Sea evidently constructs an area that has one of the largest biological CO 2 drawdowns in the world ocean. These results highlight the pivotal roles of the marginal seas and the formation of intermediate water at the end of the ocean conveyor belt.

リンク情報
DOI
https://doi.org/10.1073/pnas.2000658117
URL
http://www.pnas.org/syndication/doi/10.1073/pnas.2000658117
URL
https://pnas.org/doi/pdf/10.1073/pnas.2000658117
ID情報
  • DOI : 10.1073/pnas.2000658117
  • ISSN : 0027-8424
  • eISSN : 1091-6490

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