Phytoplankton productivity in the western subarctic gyre of the North Pacific in early summer 2006 |
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| Authors: | Tetsuichi Fujiki Kazuhiko Matsumoto Shuichi Watanabe Takuji Hosaka Toshiro Saino |
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| Institution: | (1) Mutsu Institute for Oceanography, Japan Agency for Marine-Earth Science and Technology, 690 Kitasekine, Sekine, Mutsu Aomori, 035-0022, Japan;(2) Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka Kanagawa, 237-0061, Japan;(3) Japan Science and Technology Agency, Kawaguchi Center Building, 4-1-8, Hon-cho, Kawaguchi Saitama, 332-0012, Japan |
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| Abstract: | 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. |
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