Journal of Oceanography

, Volume 67, Issue 3, pp 295–303 | Cite as

Phytoplankton productivity in the western subarctic gyre of the North Pacific in early summer 2006

  • Tetsuichi FujikiEmail author
  • Kazuhiko Matsumoto
  • Shuichi Watanabe
  • Takuji Hosaka
  • Toshiro Saino
Original Article


We deployed a profiling buoy system incorporating a fast repetition rate fluorometer in the western subarctic Pacific and carried out time-series observations of phytoplankton productivity from 9 June to 15 July 2006. The chlorophyll a (Chl a) biomass integrated over the euphotic layer was as high as 45–50 mg Chl a m−2 in the middle of June and remained in the 30–40 mg Chl a m−2 range during the rest of observation period; day-to-day variation in Chl a biomass was relatively small. The daily net primary productivity integrated over the euphotic layer ranged from 144 to 919 mg C m−2 day−1 and varied greatly, depending more on insolation rather than Chl a biomass. In addition, we found that part of primary production was exported to a 150-m depth within 2 days, indicating that the variations in primary productivity quickly influenced the organic carbon flux from the upper ocean. Our results suggest that the short-term variability in primary productivity is one of the key factors controlling the carbon cycle in the surface ocean in the western subarctic Pacific.


Organic carbon flux Phytoplankton Primary production Profiling buoy system Western subarctic Pacific 



We are grateful to the captain and crew of the R/V Mirai for their support during the cruise, to the staff of Marine Works Japan Ltd. and Global Ocean Development Inc. for their on-board analysis and deck work, and to T. Nakamura (Nichiyu Giken Kogyo) for design of an underwater profiling buoy system. We also thank M.C. Honda and H. Kawakami (JAMSTEC) for sediment trap data and their interpretation of this data. The development of the profiling buoy system was supported by the SORST (Solution Oriented Research for Science and Technology) programs of the Japan Science and Technology Agency.


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Copyright information

© The Oceanographic Society of Japan and Springer 2011

Authors and Affiliations

  • Tetsuichi Fujiki
    • 1
    • 2
    Email author
  • Kazuhiko Matsumoto
    • 1
    • 2
  • Shuichi Watanabe
    • 1
  • Takuji Hosaka
    • 3
  • Toshiro Saino
    • 2
    • 3
  1. 1.Mutsu Institute for OceanographyJapan Agency for Marine-Earth Science and TechnologyMutsuJapan
  2. 2.Research Institute for Global ChangeJapan Agency for Marine-Earth Science and TechnologyYokosukaJapan
  3. 3.Japan Science and Technology AgencyKawaguchiJapan

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