Flux of low salinity water from Aniva Bay (Sakhalin Island) to the southern Okhotsk Sea |
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| Authors: | Sachiko Oguma Tsuneo Ono Yutaka W Watanabe Hiromi Kasai Shuichi Watanabe Daiki Nomura Humio Mitsudera |
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| Institution: | 1. Hokkaido National Fisheries Research Institute, Fisheries Research Agency, 116 Katsurakoi, Kushiro, Hokkaido 085-0802, Japan;2. Faculty of Earth Environmental Science, Hokkaido University, North 10 West 5, Kita-ku, Sapporo, Hokkaido 060-0810, Japan;3. Mutsu Institute for Oceanography, Japan Agency for Marine-Earth Science and Technology, 690 Kita-Sekine, Mutsu, Aomori 035-0022, Japan;4. National Institute of Polar Research, 10-3 Midori-cho, Tachikawa-shi, Tokyo 190-8501, Japan;5. Institute of Low Temperature Science, Hokkaido University, North 19 West 8, Kita-ku, Sapporo, Hokkaido 060-0819, Japan |
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| Abstract: | In this study, we examined the relationship between the low salinity water in the shelf region of the southern Okhotsk Sea which was seasonally sampled (0–200 m), and fluxes of low salinity water from Aniva Bay. To express the source of freshwater mixing in the surface layer, we applied normalized total alkalinity (NTA) and stable isotopes of seawater as chemical tracers. NTA-S diagrams indicate that NTA of low salinity water in the upper 30 m layer just off the Soya Warm Current is clearly higher than in the far offshore region in summer and autumn. Using NTA-S regression lines, we could deduce that the low salinity and high NTA water in the upper layer originates from Aniva Bay. For convenience, we defined this water as the Aniva Surface Water (ASW) with values S < 32, NTA > 2450 μmol kg−1. Formation and transport processes of ASW are discussed using historical data. The interaction between the maximum core of high NTA water on the bottom slope of eastern Aniva Bay and an anticyclonic eddy at the mouth of Aniva Bay are concluded to control ASW formation. Upwelling of the Cold Water Belt water at the tip of Cape Krillion is considered to cause ASW outflow from Aniva Bay. |
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| Keywords: | Aniva Bay southern Okhotsk Sea normalized total alkalinity stable isotopes chemical tracers |
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