弥合差距:在卢瓦尔河口的氧气和营养预算使用盆地鱼盒模型
Nour E Boukortt1, Sabine Schmidt2, Aurelia Mouret1
1Université d'Angers, Nantes Université, Le Mans Université, CNRS, Laboratoire de Planétologie et Géosciences, LPG UMR 6112, 49000, Angers, France.
The Science of the total environment
|September 12, 2025
概括
低毒河口显示由于沉积物反而加剧营养循环和氧气耗尽. 一个结合的模型显示,冬季的洪水增强了沉积物与水的交换,而夏季的低流量导致丰富,促进了有害的藻类繁殖.
科学领域:
- 环境科学 环境科学
- 海洋学 海洋学 海洋学
- 生物地质化学生物地质化学
背景情况:
- 低毒河口是关键的沿海系统,沉积物过程显著影响营养和氧气动态.
- 了解这些沉积物-水柱相互作用对于有效管理沿海生态系统至关重要.
研究的目的:
- 开发和应用一个合的盆地-海藻盒子模型,以评估沉积物和水柱过程对低氧河口中营养物质和溶解氧气库存的影响.
- 分析这些动态在对比的水文条件下:冬季的洪水和夏季的低排放期.
主要方法:
- 开发一个结合的盆地-海藻盒子模型,整合物理和生物地球化学过程.
- 模拟2021年两个不同的水文时期的沉积物-水柱相互作用.
- 将模型输出与观察数据进行比较,以评估模型性能并讨论假设.
主要成果:
- 冬季洪水导致沉积物侵蚀显著,沉积物与水的交换很高,但短暂的水停留时间限制了溶液的积累.
- 夏季的低流量加剧了盆地营养物回收,使的度增加了高达91%,而海底流程贡献了67%.
- 酸盐的释放量很小 (4%),在度最大区 (TMZ) 的沉积物壁垒上受到限制,而海底溶解是夏季酸盐可用性的主要驱动因素.
结论:
- 观察到和回收之间的脱,有利于丰富,并可能导致有害的藻类繁殖和缺氧.
- 简化建模方法有效地识别了控制氧气和营养动态的关键河口过程.
- 该模型可适应应用于各种河口系统,以获得管理见解.
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