Temporal change in nutrient concentrations and phytoplankton biomass in short time scale local upwelling around the Izu Peninsula, Japan* |
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| Authors: | Takahashi, M. Ishizaka, J. Ishimaru, T. Atkinson, L.P. Lee, T.N. Yamaguchi, Y. Fujita, Y. Ichimura, S. |
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| Affiliation: | 1Institute of Biological Sciences, University of Tsukuba Sakura-mura, Ibaraki 305 2Ocean Research Institute, University of Tokyo Minami-dai, Nakano-ku, Tokyo 164 3Skidaway Institute of Oceanography P.O. Box, 13687, Savannah, Georgia 31416 4Rosenstiel School of Marine and Atmospheric Science, University of Miami Miami, Florida 33149, USA 5Laboratory of Biology, College of Liberal Arts, Saitama University Shimookubo, Urawa 338 6National Institute for Basic Biology Okazaki, Aichi, 444, Japan 7Present address: Botany Department, University of Tokyo Hongo, Tokyo 113, Japan |
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| Abstract: | Temporal changes in nitrate plus nitrite and chlorophyll concentrationswere observed by continuous shipboard measurements in upwelledand coastal water masses covering an area 20 x 30 km2 alongthe Izu Peninsula between May 22 and 26, 1982. Two localizedupwelling events were observed, one which had occurred beforeMay 22 and the other on May 26. Nutrient input into the surfacefrom upwelling and subsequent phytoplankton growth were clearlydocumented. Phytoplankton growth, estimated from the disappearanceof nutrients, agreed well with modelling estimates based uponsimulated culture experiments done previously in the same area.Phytoplankton growth terminated when nutrients were depleted.Similar stimulation of phytoplankton growth supported by localizedupwelling can be expected in other coastal regions where similarconditions exist. |
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