Regional environmental degradation after mid-2010s, possible links with flow pattern change in a semi-enclosed sea (Ise Bay, Japan)

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science Pub Date : 2025-04-23 DOI:10.1016/j.rsma.2025.104205

Kazuhiro Aoki , Shigeho Kakehi , Sayaka Sogawa , Kazuhiro Hanyu , Asatarou Tsuge , Rentarou Nakashima

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Abstract

Worldwide, oligotrophication has been revealed to be occurring under the reduction of the anthropogenic nutrient load in coastal waters. Recent environmental changes such as oligotrophication and/or climate change have been reported in previous studies, however outcomes differ depending on the situation. This study demonstrated the environmental degradation during the 2000s–2010s based on in-situ data in Ise Bay, a semi-enclosed bay in Japan, and examines about the contribution of a change in the flow pattern (offshore water intrusion) using a diagnostic hydrodynamic model. Oligotrophication, increased DIN/DIP ratio and increased thickness of the low DO water mass occurred in the mid-2010s when the fisheries yield decreased. Results of a diagnostic model suggest that the flow pattern in spring and autumn alternated to a horizontal circulation from an estuarine vertical circulation. The flow pattern change contributed to the environmental degradation (oligotrophication and hypoxia) in the western area which is hardly influenced by the offshore water intrusion.

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2010年代中期以后区域环境退化与半封闭海流型变化的可能联系（伊势湾，日本）

在世界范围内，已发现在沿海水域人为营养物负荷减少的情况下发生了少营养化。最近的环境变化，如少营养化和/或气候变化，在以前的研究中已经报道过，但结果因情况而异。本研究基于日本半封闭海湾伊势湾（Ise Bay）的现场数据，展示了2000年至2010年期间的环境退化，并使用诊断水动力模型研究了流型变化（近海水入侵）的贡献。2010年代中期，渔业产量下降，低DO水体出现了富营养化现象，DIN/DIP比值增加，水体厚度增加。诊断模型的结果表明，春季和秋季的流型由河口垂直环流转变为水平环流。流型的变化导致了西部地区的环境退化（贫营养化和缺氧），而西部地区几乎不受近海水入侵的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Regional Studies in Marine Science Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics

CiteScore

3.90

自引率

4.80%

发文量

336

审稿时长

69 days

期刊介绍： REGIONAL STUDIES IN MARINE SCIENCE will publish scientifically sound papers on regional aspects of maritime and marine resources in estuaries, coastal zones, continental shelf, the seas and oceans.