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首页> 外文期刊>Estuarine Coastal and Shelf Science >Hypoxic water mass in the highly turbid well-mixed macrotidal Rokkaku River Estuary, Ariake Sea, Japan
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Hypoxic water mass in the highly turbid well-mixed macrotidal Rokkaku River Estuary, Ariake Sea, Japan

机译：日本有明海混浊高度混合的巨潮六甲河河口中的低氧水团

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摘要

Hypoxic water masses are usually formed in the bottom layer of stratified water columns. However, we found that hypoxia was formed throughout the water column in a well-mixed macrotidal estuary, the Rokkaku River Estuary, Japan. There was a spring-neap variation in the dissolved oxygen (DO) concentration where hypoxia developed during spring tides. Minimum DO concentration was observed 1 or a few days after the spring tide. When hypoxia developed, all the water column from bottom to surface became hypoxic ( 2 mg l(-1) or 30% saturation). The hypoxic water mass was associated with the estuarine turbidity maximum (ETM). Oxygen demand of water in this area was very large ( 2 mg l(-1) day(-1)). Potential oxygen consumption by microorganisms was positively correlated with turbidity. Concentration of suspended solid (SS) at the ETM exceeded 1000 mg l-1. Furthermore, particulate organic carbon (POC) concentration in the estuary increased in spring tides. C/N ratio and delta C-13 of organic matter suggested that POC was transported from the sea into the estuary. These results suggest that the active resuspension of organic matter caused by the strong tidal current during spring tides enhanced the respiratory activity of microorganisms and the main source of the organic matter was detrital material from the sea. Such a large amount of organic matter should fuel microbial respiration effectively. Since microbial oxygen consumption was larger than the oxygen supply from the water surface even in the well mixed condition, a hypoxic water mass was formed in this estuary.
机译：缺氧水团通常形成在分层水柱的底层。然而，我们发现在一个混合良好的巨潮河口（日本六国河河口）的整个水柱中都形成了缺氧。春季潮汐过程中发生的缺氧导致溶解氧（DO）浓度出现春季变化。春季潮后1天或几天观察到最低溶解氧浓度。当发生缺氧时，从底部到地面的所有水柱都变为缺氧状态（<2 mg l（-1）或<30％饱和度）。低氧水量与河口浊度最大值（ETM）相关。该地区水的氧气需求非常大（> 2 mg l（-1）天（-1））。微生物潜在的耗氧量与浊度呈正相关。 ETM上的悬浮固体（SS）浓度超过1000 mg l-1。此外，春季潮汐时河口中的颗粒有机碳（POC）浓度增加。 C / N比和有机物的C-13增量表明POC是从海中运输到河口的。这些结果表明，春季潮汐期间强潮汐引起的有机物的主动悬浮增强了微生物的呼吸活性，有机物的主要来源是来自海洋的碎屑物质。如此大量的有机物应该有效地促进微生物的呼吸。由于即使在充分混合的条件下，微生物的耗氧量仍大于从水表面供氧的量，因此在该河口形成了缺氧水团。

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