Seasonal variation in the transverse and layered structure of estuarine circulation in Ariake Bay, Japan |
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| Authors: | Tetsuo Yanagi Mayumi Shimomura |
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| Institution: | aResearch Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan;bGraduate School of Science and Engineering, Kyushu University, Kasuga 816-8580, Japan |
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| Abstract: | Seasonal variation in the transverse and layered structure of estuarine circulation in Ariake Bay, Japan was investigated by box model analysis using monthly salinity data from 1990 to 2000. Two-layered gravitational estuarine circulation was intensified from autumn to spring (vertically well mixed season) accompanied by a small river discharge. Two-layered circulation was weakened accompanying the transversely segregated cyclonic circulation in the upper layer during summer (stratified season) with a large river discharge. Such seasonal variation in the transverse and layered structure of estuarine circulation is because the bay width of Ariake Bay (20 km) is narrower than the external Rossby deformation radius (235 km) but wider than the internal Rossby deformation radius (3–5 km). |
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| Keywords: | Estuarine circulation Rossby deformation radius Salt budget ROFI Kelvin number |
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