東京湾における海水交換に及ぼす淡水流入と密度成層と風の影響
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概要
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Water quality survey in Tokyo Bay was conducted weekly/monthly during 2008-2011 in order to investigate short timescale variability of water exchange. Calculated average residence time of freshwater fluctuated significantly accompanied with variability of freshwater discharge and wind. Sorted data by freshwater discharge and southerly wind speed indicate that significant decreases in the surface salinity and bottom DO were caused especially by southerly winds. Our model result suggests that these phenomena are caused by the anti-cyclonic circulation and easterly current along the northshore induced by the southerly winds forcing to trap the less saline water and hypoxia in the Bay, which weakened water exchange due to the vertical circulation (outflow of surface less saline water and inflow of bottom saline water).
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