在阿拉伯海东南部影响近岸缺氧的因素:基于传感器的研究
S Abdul Azeez1, T R Gireeshkumar1, K R Muraleedharan1
1CSIR - National Institute of Oceanography, Regional Centre, 31261, Kochi 682 018, India.
Marine pollution bulletin
|October 28, 2023
概括
阿拉伯海的沿海缺氧显示出显著的日间变化. 每小时的浮标数据显示,早上氧气含量较低,下午由于风引起的混合而提高到过的水平.
科学领域:
- 海洋学 海洋学 海洋学
- 海洋化学 海洋化学
- 环境科学 环境科学
背景情况:
- 季节性上升和沿海缺氧得到了很好的研究,但短期变化仍然不太了解.
- 阿拉普普扎海岸的泥银行提供了一个独特的,宁静的环境,用于连续的传感器测量.
- 了解昼间氧气动态对于沿海生态系统健康至关重要.
研究的目的:
- 报告近岸水域温度,盐度和溶解氧气的第一个每小时变化.
- 调查阿拉伯海东南部缺氧的日间尺度变化.
- 识别导致短期氧气波动的环境因素.
主要方法:
- 在阿拉普扎近海水域部署带有传感器的环境数据浮标 (2022年4月至8月).
- 连续每小时记录温度,盐度和溶解氧气.
- 统计分析将环境参数 (如风速) 与氧气度相关联.
主要成果:
- 尽管上游强度增加,但在溶解氧气中观察到显著的日间变化.
- 沿海附近的水域从00:00到12:00时是低氧的,从12:00到24:00时成为正常的和超和的.
- 风速与地下氧气有显著的相关性;速度>5m/s增强混合和减轻缺氧.
结论:
- 风引起的混合在减轻白天范围内的沿海缺氧方面发挥着至关重要的作用.
- 对氧气超和的动能值为11.5 J/m3被确定.
- 需要进行进一步的生物地化学和生态研究,以了解交替氧化-低氧化条件的影响.
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