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広域定期観測による有明海水環境の現状(シンポジウム:沿岸海洋学からみた有明海問題)

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Title: 広域定期観測による有明海水環境の現状(シンポジウム:沿岸海洋学からみた有明海問題)
Other Titles: Current Water Environment of Ariake Bay Observed from Routine Surveys(Symposium: Ariake Sound Issues from a Viewpoint of Coastal Oceanography)
Authors: 堤, 裕昭1 Browse this author →KAKEN DB
木村, 千寿子2 Browse this author
永田, 紗矢香3 Browse this author
佃, 政則4 Browse this author
山ロ, 一岩5 Browse this author
高橋, 徹6 Browse this author
門谷, 茂7 Browse this author →KAKEN DB
Authors(alt): Tsutsumi, Hiroaki1
Kimura, Chizuko2
Nagata, Sayaka3
Tsukuda, Masanori4
Yamaguchi, Hitomi5
Takahashi, Tohru6
Montani, Shigeru7
Keywords: 有明海
諌早湾
赤潮
成層構造
Issue Date: 25-Aug-2004
Publisher: 日本海洋学会沿岸海洋研究会
Journal Title: 沿岸海洋研究
Volume: 42
Issue: 1
Start Page: 35
End Page: 42
Abstract: 1998年以降,毎年秋季から初冬にかけて大規模な赤潮が発生し,ノリの色落ち被害が起きている有明海で,縦断方向に約3km間隔で設定した13ヵ所の調査地点で2002年4月から2003年4月に合計10回行った水質調査の結果の概略を示す.調査期間中,2002年7月および10月に,最大面積が600km^2を超える大規模な赤潮が,いずれも最奥部の佐賀県から福岡県および熊本県北部の沿岸域で発生した.その発生過程は,有明海奥部海域へ流入する河川水で表層が低塩分化して塩分成層が形成され,そこへ大量の栄養塩が流入して栄養塩濃度がDINで40μmolL^<-1>,DIPで2μmolL^<-1>を超えるような高濃度に達し,大規模な赤潮が発生した.つまり,表層の低塩分化による成層構造が形成された時,その表層に陸域から大量の栄養塩が流入して極端な富栄養化状態が一時的に発生し,植物プランクトンが急速に増殖して赤潮へと発展した.
Since 1998, large scale red tides have occurred in autumn and early winter. We established 13 sampling stations at intervals of approximately 3km on a longitudinal line in Ariake Bay, and surveyed the vertical profile of water quality at each station ten times from April, 2002 to April, 2003. In this study, we twice July and November, 2003 observed a large scale red tide that extended for over 600km^2 from the coast of Saga Prefecture, at the innermost areas of Ariake Bay, to Fukuoka and Kumamoto Prefectures. From the results of this study, the process of red tide blooms in these areas can be described as follows. First, the water in the innermost areas of Ariake Bay was stratified due to a decrease of salinity in the surface layer of water loaded from rivers. A large amount of nutrient was transported from the rivers to the innermost areas of the bay, and concentrated in the surface layer of the stratified water. The concentration of the nutrients rapidly increased, but only at the surface layer of the water, and temporarily became extremely eutrophicated at over 40μmol L^<-1> in DIN and 2μmol L^<-1> in DIP; resulting in the occurrence of a red tide in just this surface layer. Therefore, the occurrence of the large scale of red tide in the inner areas of Ariake Bay started from the occurrence of the halocline conditions of a well-defined vertical salinity gradient.
Type: article
URI: http://hdl.handle.net/2115/56491
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 門谷 茂

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