Primary productivity and solar radiation off Sanriku in May 1997 |
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Authors: | Akihiro Shiomoto Shinji Hashimoto Takayuki Murakami |
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Institution: | (1) National Research Institute of Far Seas Fisheries, 7-1. Orido 5 chome, 424-8633 Shimizu, Shizuoka, Japan;(2) School of Marine Science and Technology, Tokai University, 20-1, Orido 3 chome, 424-0902 Shimizu, Shizuoka, Japan |
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Abstract: | We measured the in situ primary production at four stations from the surface to 80 m off Sanriku in late May 1997. The depth-integrated
daily primary production in the upper 80 m was estimated to be 391, 468, and 855 mgC m−2d−1 in water from the Oyashio, and 336 mgC m−2d−1 in the warm-core ring. The variation in the primary production was primarily due to the variation in phytoplankton activity
(chlorophyll α-specific primary production). A combination of previous and present studies in water from the Oyashio and the
warm-core ring suggested that phytoplankton activity is proportional to light intensity between 12 and 50 Ein m−2d−1 which is close to the usual light condition (61–75 Ein m−2d−1) off Sanriku in May and June. Light may be a limiting factor for phytoplankton off Sanriku in late spring and early summer. |
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Keywords: | Off Sanriku daily primary production chlorophylla-specific primary production light |
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