TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 63 (No. 3), pp. 517-524, 2007

Verification of Vertically Generalized Production Model and Estimation of Primary Production in Sagami Bay, Japan

Joji Ishizaka1*, Eko Siswanto2,3, Tetsuya Itoh2,4, Hiroshi Murakami5, Yukuya Yamaguchi6, Naho Horimoto6, Takashi Ishimaru6, Shinji Hashimoto7 and Toshiro Saino7

1Faculty of Fisheries, Nagasaki University, Bunkyo, Nagasaki, Nagasaki 852-8521, Japan
2Graduate School of Science and Technology, Nagasaki University, Bunkyo, Nagasaki, Nagasaki 852-8521, Japan
3Seikai National Fisheries Research Institute, Taira, Nagasaki, Nagasaki 851-2213, Japan
4Nagasaki Kakuyo High School, Sueishi, Nagasaki, Nagasaki 850-0991, Japan
5Earth Observation Research and Application Center, Japan Aerospace Exploration Agency, Sengen, Tsukuba, Ibaraki 305-8505, Japan
6Faculty of Marine Science, Tokyo University of Marine Science and Technology, Konan, Minato-ku, Tokyo 108-8477, Japan
7Hydrospheric-Atmospheric Research Center, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan

(Received 12 September 2005; in revised form 8 November 2006; accepted 27 November 2006)

Abstract: The Vertically Generalized Production Model (VGPM) was verified by the primary production data of the Sagami Bay, Japan. The VGPM with open ocean parameters including PBopt, maximum primary production per unit of chlorophyll a in the water column, explained only 40% of the variability of integrated primary production. Formulations of the open ocean PBopt showed no correlation with In situ PBopt. Adjustment of the parameters of chlorophyll a and temperature dependent PBopt improved the estimation of integrated primary production to 47% of the variation. Vertical integration parameters of VGPM also have to be adjusted to improve the estimation. Integrated primary production calculated with a stronger light dependency and with the adjusted PBopt model can explain 74% of the variation. This model was used to estimate primary production of the Sagami Bay during 2003 with satellite data. In situ measurements on cloudy days indicate that the use of satellite data from sunny days only overestimates primary production.

*Corresponding author E-mail: ishizaka@nagasaki-u.ac.jp

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