Seasonal variation of particulate organic nitrogen in the Tsushima Straits

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  • Onitsuka Goh
    National Research Institute of Fisheries and Environment of Inland Sea
  • Watanabe Atsushi
    Graduate School of Information Science and Engineering, Tokyo Institute of Technology
  • Morimoto Akihiko
    Hydrospheric Atmospheric Research Center, Nagoya University
  • Takikawa Tetsutaro
    Department of Fisheries Distribution and Management, National Fisheries University
  • Moku Masatoshi
    Atmosphere and Ocean Research Institute, The University of Tokyo
  • Yanagi Tetsuo
    Research Institute for Applied Mechanics, Kyushu University

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Other Title
  • 対馬海峡における懸濁態有機窒素の季節変化
  • ツシマ カイキョウ ニ オケル ケンダクタイ ユウキ チッソ ノ キセツ ヘンカ

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Abstract

Field observations were conducted to reveal the seasonal variation of particulate organic nitrogen (PON) in the Tsushima Straits. The concentration of PON was roughly equivalent level to that of dissolved inorganic nitrogen (DIN; nitrate+nitrite) from the surface to the subsurface layer throughout the year. The PON in. March was the highest concentration among the months. The ratio of POC/PON (6.4) was nearly the same value as the Redfield ratio (6.6), and the PON concentration significantly correlated to the chlorophyll α concentration, suggesting that most particulate organic matter was composed of phytoplankton. Horizontal transport of PON through the eastern channel of the Tsushima Straits was compared with that of DIN. The ratio of PON transport to total nitrogen (DIN+PON) transport was 66, 36, 25 and 16% in March, June, September and November, respectively. Since the penetration of organic matter through the Tsushima Straits becomes a consequential nutrient load because of decomposition of inorganic matter in the Japan Sea, oceanographic conditions including organic matter should be monitored in the Tsushima Straits.

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