Long-term variability of shelf water intrusion and its influence on hydrographic and biogeochemical properties of the Seto Inland Sea, Japan |
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Authors: | Shiho Kobayashi Tateki Fujiwara |
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Institution: | (1) Kyoto University, Kitashirakawa Oiwake, Sakyo-ku, Kyoto 606-8502, Japan |
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Abstract: | The variability of the pathway of the Kuroshio is known to control that of the intensity of upwelling of the cold and nutrient-rich
deep shelf water at the shelf-break point. This study has investigated the influences of the long-term variability of the
hydrographical and biogeochemical conditions at the shelf-break point on those in the inner Seto Inland Sea. Results from
observations conducted since 1972 by prefectural fisheries observatories showed a temporary decrease of temperature in the
lower layer of the entrance of Kii Channel in summertime in the specific years when the Kuroshio pathway favored deep shelf
water intrusion. A corresponding change in temperature was also found in the inner shelf sea, such as western Osaka Bay and
Harima-Nada. The model developed in this study covers a 30-year period and well reproduces the temporal change in temperature.
It also shows sufficient reproducibility in both seasonal behavior of hydrographical and biogeochemical properties and the
inter-annual variability of hydrographical properties throughout the eastern Seto Inland Sea. It was found that the inter-annual
variations of annual total flux through the section at the entrance to Kii Channel affect the inter-annual variation of the
observed concentration of Dissolved Inorganic Nitrogen (DIN) in Harima Nada, but the effect was smaller than those of river
input and other parameters. |
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Keywords: | Nutrient transport shelf water intrusion inter-annual variability Kuroshio Seto Inland Sea |
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