Hydrography and budget of dissolved total nitrogen and dissolved oxygen in the stratified season in Mikawa Bay,Japan |
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| Authors: | Teruaki Suzuki Yasuo Matsukawa |
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| Institution: | (1) Aichi Prefectural Fisheries Experimental Station, Wakamiya 97, Miya-cho, Gamagori-shi, 443 Aichi, Japan;(2) Tokai Regional Fisheries Research Laboratory, Kachidoki 5-5-1, Chuo-ku, 104 Tokyo, Japan |
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| Abstract: | Distributions of salinity, dissolved total nitrogen (DTN) and dissolved oxygen (DO) were observed once a month throughout a year in Mikawa Bay, one of the most eutrophic bays in Japan. Supply of freshwater, DTN and DO from the land and precipitation was estimated. Hydrography, circulation and transformation of DTN and DO during the stratified period were investigated simultaneously by a two-layered box model analysis dividing the bay into five boxes. The two-layered circulation was confirmed. In the upper layer of the river mouth regions, a high production of particulate organic nitrogen (PON) due to the strong upwelling together with the river inflow was found. On the other hand, in the lower layer of the bay mouth region, a high deposition of PON due to weak upwelling and sometimes downwelling and a high decomposition of PON due to the inflow of DO abundant water were also found. The reason why the eutrophication is more severe in the eastern part than in the north-western part of the bay is discussed. |
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