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Ocean Science An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/osd-6-1717-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/osd-6-1717-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  11 Aug 2009

11 Aug 2009

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This preprint was under review for the journal OS but the revision was not accepted.

Subsurface primary production in the western subtropical North Pacific as evidence of large diapycnal diffusivity associated with the Subtropical Mode Water

C. Sukigara1, T. Suga1,2, T. Saino2, K. Toyama1, D. Yanagimoto3, K. Hanawa1, and N. Shikama2 C. Sukigara et al.
  • 1Department of Geophysics, Tohoku University, Sendai, Japan
  • 2Japan Agency of Marine – Earth Science and Technology, Yokosuka, Japan
  • 3Ocean Research Institute, The University of Tokyo, Tokyo, Japan

Abstract. A profiling float equipped with a fluorometer, a dissolved oxygen sensor, and temperature and salinity sensors was deployed in the Subtropical Mode Water (STMW) formation region. It acquired quasi-Lagrangian, 5-day-interval time-series records from March to July 2006. The time-series distribution of chlorophyll a showed a sustained and sizable deep chlorophyll maximum at 50–80 m, just above the upper boundary of the STMW, throughout early summer (May–July). Vertically integrated chlorophyll values during this period consistently ranged from 15–30 mg m−2, indicating sustained primary production and a continuous supply of nutrients ranging from 10–30 mgN m−2 day−1. The time-series data showed no appreciable sporadic events of nutrient supply. Instead, our results support the recently measured large vertical diffusivity values (~5×10−4 m2 s) near the top of the STMW, which would cause a diffusive nitrate supply of ~30 mgN m−2 day−1 from the STMW layer to the euphotic zone.

C. Sukigara et al.

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C. Sukigara et al.

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