在一个城市河口的高频溶解氧气动态,长岛声音
Melissa S Duvall1, James D Hagy2, James W Ammerman3,4
1U.S. Environmental Protection Agency, Long Island Sound Office, 888 Washington Blvd., Stamford, CT 06904 USA.
概括
潮引流显著影响了长岛海峡 (LIS) 西部溶解氧 (DO) 水平. 高频数据显示潮运输DO,影响低氧持续时间和区域,对水质管理至关重要.
科学领域:
- 环境科学 环境科学
- 海洋学 海洋学 海洋学
- 水质监测 水质监测
背景情况:
- 西部长岛湾 (LIS) 的季节性深水缺氧是一个长期存在的问题,以前通过水质调查和浮标进行研究.
- 现有的研究主要集中在影响底层溶解氧 (DO) 的潜潮因素上.
- 在日间和半日间时间尺度上高频度的DO变化仍然不太了解.
研究的目的:
- 分析2021-2022年夏季停泊浮标的连续时间序列数据.
- 调查控制表面和底部高频波动的因素.
- 了解潮导向在调节西部LIS中缺氧中的作用.
主要方法:
- 来自停泊浮标的表面和底部DO数据的连续时间序列分析 (2021-2022年夏季).
- DO波动与生物生产和潮引流的相关性.
- 通过每周巡航调查进行验证,以解决水平和垂直的DO梯度.
主要成果:
- 表面的DO日间波动与生物生产有关;底部的DO半日间波动与来自东河的潮引流有关.
- 潮引流在调节西部LIS中缺氧持续时间方面发挥着关键作用.
- 尽管2021年分层较强,但低氧持续时间较短,原因是潮DO向增加,与2022年形成鲜明对比.
结论:
- 高频数据显示,潮向作为影响DO和低氧持续时间的关键因素在西LIS.
- 每周的调查可能无法捕捉占主导地位的DO变化时间尺度,影响低氧持续时间的估计.
- 自2017年以来,西部狭窄地区的低氧面积增加表明对营养减少的空间可变反应;未来的研究需要高频数据.
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