FIELD OBSERVATION OF BLUE TIDE UPWELLING AND OUTFLOW TO MIDDLE LAYER IN TOKYO BAY

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  • 東京湾奥部における青潮の湧昇と中層流出現象の現地観測
  • トウキョウワン オウブ ニ オケル アオ チョウ ノ ヨウショウ ト チュウソウ リュウシュツ ゲンショウ ノ ゲンチ カンソク

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Abstract

 The purpose of this study is to analyze the relationship between high turbidity and sulfur, and transfer of a blue tide after upwelling. We achieved ship observations of a blue tide at 24th August 2015 on the inner part of Tokyo Bay. Upwelling water of the blue tide outflowed to the middle layer for analyzing a composition of the blue tide water. It was considered that a density of upwelling water decreased slightly due to mix with around surface water. The blue tide water drifted on a pycnocline for wind driven current and density current. There was a definite positive correlation between turbidity and sulfur from analysis of water samples. Therefore, high turbidity indicates the particulate sulfur element in a blue tide. It was found from the analysis of automatic water quality measurement systems that an upwelling of high density water was not always to produce extensive blue tide. An occurrence of large-scale blue tide may depend on an accumulation of hydrogen sulfide on a flat bottom area of the bay.

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