Spatial variability in the primary productivity in the East China Sea and its adjacent waters |
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| Authors: | T Hama K H Shin N Handa |
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| Affiliation: | (1) Institute for Hydrospheric-Atmospheric Sciences, Nagoya University Chikusa-ku, 464-01 Nagoya, Japan;(2) Present address: Laboratory of Marine and Atmospheric Geochemistry, Graduate School of Environmental Earth Science, Hokkaido University, 060 Sapporo, Japan;(3) Present address: Aichi Prefectural University, Mizuhoku, 467 Nagoya, Japan |
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| Abstract: | Primary productivity in the East China Sea and its adjacent area was measured by the13C tracer method during winter, summer and fall in 1993 and 1994. The depth-integrated primary productivity in the Kuroshio
Current ranged from 220 to 350 mgC m−2d−1, and showed little seasonal variability. High primary productivity (above 570 mgC m−2d−1) was measured at the center of the continental shelf throughout the observation period. The productivity at the station nearest
to the Changjiang estuary exhibited a distinctive seasonal change from 68 to 1,500 mgC m−2d−1. Depth-integrated primary productivity was 2.7 times higher in the shelf area than the rates at the Kuroshio Current. High
chlorophyll-a specific productivity (mgC mgChl.-a−2d−1) throughout the euphotic zone was mainly found in the shelf area rather than off-shelf area, probably due to higher nutrient
availability and higher activity of phytoplankton at the subsurface layer in the shelf area. |
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| Keywords: | Primary productivity East China Sea Kuroshio Current phytoplankton 13C tracer method |
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