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首页> 外文期刊>Journal of oceanography >The mechanism of bottom water DO variation in summer at the northern mouth of Isahaya Bay, Japan
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The mechanism of bottom water DO variation in summer at the northern mouth of Isahaya Bay, Japan

机译：日本Is早湾北口夏季底水溶解氧变化的机理

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Recently, bivalves have been massively killed by anoxia or hypoxia in summer at the northern part of Isahaya Bay, Japan, which constituted a major problem for fisheries. However, the mechanism behind the occurrence of hypoxic water masses is unclear. It is known that the bottom water dissolved oxygen (DO) in this area is affected by the inflow of seawater into the northern mouth of Isahaya Bay. To understand the mechanism of hypoxia, it is necessary to determine the physical processes that cause changes in the bottom DO concentrations in this area. This study shows that there is a neap-spring tidal variation in bottom DO due to a change in vertical tidal mixing, and it also suggests that the decrease in bottom DO was generated by a baroclinic flow, which is due to the internal tide, and a shear flow, which is induced by the external tide in the bottom boundary layer. In addition, our study suggests that the source of cold and hypoxic water that appears in the bottom layer at low tide is the inner area of the Ariake Sea.
机译：最近，在日本的Is早湾北部，双壳类动物在夏季因缺氧或缺氧而大量死亡，这是渔业的主要问题。但是，缺氧水团发生的机理尚不清楚。众所周知，该地区的底水溶解氧（DO）受海水流入Is早湾北口的影响。要了解缺氧的机制，有必要确定导致该区域底部DO浓度变化的物理过程。这项研究表明，由于垂直潮汐混合的变化，底部DO出现了潮汐潮汐变化，这也表明底部DO的下降是由于斜压流动引起的，这是由于内部潮汐引起的，并且剪切流，它是由底部边界层中的外部潮汐引起的。此外，我们的研究表明，退潮时底层出现的冷缺氧水源是有明海的内部区域。

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