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Enhanced vertical turbulent nitrate flux in the Kuroshio across the Izu Ridge

Authors
  • Tanaka, T.1
  • Hasegawa, D.1
  • Yasuda, I.2
  • Tsuji, H.2
  • Fujio, S.2
  • Goto, Y.3
  • Nishioka, J.4
  • 1 Tohoku National Fisheries Research Institute, Japan Fisheries Research and Education Agency, 3-27-5 Shinhama-cho, Shiogama, Miyagi, 985-0001, Japan , Shiogama (Japan)
  • 2 The University of Tokyo, Atmosphere and Ocean Research Institute, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8564, Japan , Kashiwa (Japan)
  • 3 Hakodate Local Meteorological Office, Japan Meteorological Agency, 3-4-4, Mihara, Hakodate, Hokkaido, 041-0806, Japan , Hakodate (Japan)
  • 4 Hokkaido University, Institute of Low Temperature Sciences, Kita-19, Nishi-8, Kita-ku, Sapporo, Hokkaido, 060-0819, Japan , Sapporo (Japan)
Type
Published Article
Journal
Journal of Oceanography
Publisher
Springer Singapore
Publication Date
Nov 02, 2018
Volume
75
Issue
2
Pages
195–203
Identifiers
DOI: 10.1007/s10872-018-0500-2
Source
Springer Nature
Keywords
License
Yellow

Abstract

The first direct measurements of vertical turbulent nitrate flux, FluxNO3, were conducted in the Kuroshio across the Izu Ridge and revealed large FluxNO3 near the sill crest at the 1% light depth. This large FluxNO3 possibly enhances downstream phytoplankton growth. Extremely large FluxNO3 was also observed at 26.0–26.6 σθ between the core of the Kuroshio nutrient stream and the North Pacific Intermediate Water. We hypothesize that strong vertical mixing in the Izu Ridge draws sufficient nitrate upward from the North Pacific Intermediate Water to the nutrient stream, which eventually impacts the downstream biogeochemistry in the western North Pacific.

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