Abstract
We investigated the water structure and nutrient distribution in the Suruga Bay from April 2000 to July 2002, especially the Offshore Water, which occupies a large part of the bay. The maximum salinity in the upper 200 m varied between 34.49 and 34.71, indicating a temporal change in the influence of Kuroshio Water on the Offshore Water. Seasonal variation in nutrient concentrations was largest from surface to 50 m. On the other hand, the variance in nutrient concentrations within each season was largest in the subsurface layer of 100–300 m in spring, summer and fall. In the Offshore Water, the change of nutrients was negatively correlated with that of salinity in each season. This suggests that an increasing intrusion of saline water brings about a lower nutrient concentration in the Offshore Water. Likewise, negative correlations were observed between the change of the maximum salinity and chlorophyll a (Δ [chl.a-int])/nutrients integrated in the upper 200 m. Δ[chl.a-int] was significantly correlated with the changes of nitrate and phosphorus, but there were no significant correlations between Δ[chl.a-int] and the change of silicate. These results suggest that the concentrations of chlorophyll a and nutrients in the Offshore Water were decreased due to the increasing intrusion of Kuroshio Water. The Offshore Water is likely to be related to the regulation of primary production by nitrate.
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References
Aoki, M. (1993): Seasonal changes of chlorophyll a distribution at the northern part of Suruga Bay, central Japan. Bull. Inst. Oceanic Res. & Develop., Tokai Univ., 14, 105–118 (in Japanese with English abstract).
Chen, X., S. E. Lohrenz and D. A. Wiesenburg (2000): Distribution and controlling mechanisms of primary production on the Louisiana-Texas continental shelf. J. Mar. Sys., 25, 179–207.
Hansen, H. P. and F. Koroleff (1999): Determination of nutrients. p. 159–228. In Methods of Seawater Analysis (third edition), ed. by K. Grasshoff, K. Kremling and M. Ehrhardt, Wiley-VCH, Weinheim.
Inaba, H. (1981): Circulation pattern and current variations with report to tidal frequency in the sea near the head of Suruga Bay. J. Oceanogr. Soc. Japan, 37, 149–159.
Inaba, H. (1984): Current variation in the sea near the mouth of Suruga Bay. J. Oceanogr. Soc. Japan, 40, 193–198.
Kasai, A., S. Kimura, H. Nakata and Y. Okazaki (2002): Entrainment of coastal water into a frontal eddy of the Kuroshio and its biological significance. ICES J. Mar. Sys., 37, 185–197.
Komatsu, K. and K. Kawasaki (2002): Unique hydrographic structure of intermediate water offshore the Enshu-nada in the Kuroshio region south of Japan. Bull. Fish. Res. Agen., 5, 1–22 (in Japanese with English abstract).
Levitus, S. (1982): Climatological Atlas of the World Ocean. NOAA Professional Paper 13, U.S. Governmental Print Office, Washington, D.C., 173 pp.
Lohrenz, S. E., G. L. Fahnenstiel, D. G. Redalje, G. A. Lang, M. J. Dagg, T. E. Whiteledge and Q. Dortch (1999): Nutrients, irradiance, and mixing as factors regulating primary production in coastal waters impacted by the Mississippi River plume. Cont. Shelf Res., 19, 1113–1141.
Nakamura, Y. (1982): Oceanographic feature of Suruga Bay from view point of fisheries oceanography. Bull. Shizuoka Pref. Fish. Exp. Stn., 17, Special Issue, 1–153 (in Japanese with English abstract).
Nakamura, Y. and H. Muranaka (1979): Temporal fluctuation of oceanographic structure in the Suruga Bay and Enshunada. Bull. Japan Soc. Fish. Oceanogr., 34, 128–133 (in Japanese).
Pike, S. M. and S. B. Moran (1997): Use of Poretics® 0.7 µm pore size glass fiber filter for determination of particulate organic carbon and nitrogen in seawater and freshwater. Mar. Chem., 57, 355–360.
Shiomoto, A. and S. Hashimoto (1999): Relationship between chlorophyll a and nutrients in Suruga Bay, central Japan May 1996. Bull. Japan Soc. Fish Oceanogr., 63, 1–7 (in Japanese with English abstract).
Suzuki, R. and T. Ishimaru (1990): An improved method for the determination of phytoplankton chlorophyll using N, N-dimethylformamide. J. Oceanogr. Soc. Japan, 46, 190–194.
Takeuchi, K. and T. Hibiya (1997): Numerical simulation of baroclinic tidal currents in Suruga Bay and Uchiura Bay using a high resolution level model. J. Oceanogr., 53, 539–552.
Toyota, Y. (1985): Section III chemical, Chapter 11 Suruga Bay. p. 457–462. In Coastal Oceanography of Japanese Islands, ed. by Coastal Oceanography Research Committee, the Oceanographic Society of Japan, Tokai University Press, Kanagawa (in Japanese).
Toyota, Y., Y. Misawa and T. Nanaumi (1993): Submarine topography and nutrients distribution in Senoumi bank area, Suruga Bay. Bull. Inst. Oceanic Res. & Develop., Tokai Univ., 14, 125–133 (in Japanese with English abstract).
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Iwata, T., Shinomura, Y., Natori, Y. et al. Relationship between Salinity and Nutrients in the Subsurface Layer in the Suruga Bay. J Oceanogr 61, 721–732 (2005). https://doi.org/10.1007/s10872-005-0079-2
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DOI: https://doi.org/10.1007/s10872-005-0079-2