Hypoxic water mass in the highly turbid well-mixed macrotidal Rokkaku River Estuary, Ariake Sea, Japan

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) concentr...

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Bibliographic Details
Published in:Estuarine, coastal and shelf science coastal and shelf science, 2019-04, Vol.219 (C), p.210-222
Main Authors: Hayami, Yuichi, Wada, Minoru, Umezawa, Yu, Fujii, Naoki, Nakamura, Akito, Mori, Fumiaki
Format: Article
Language:English
Subjects:
Ariake Sea
Estuarine turbidity maximum
Hypoxia
Microbial respiration
Spring-neap variation
Well-mixed estuary
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Summary: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 (
ISSN:0272-7714
1096-0015
DOI:10.1016/j.ecss.2019.02.011