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首页> 外文期刊>Estuarine Coastal and Shelf Science >High resolution monitoring of episodic stratification events in an enclosed marine system
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High resolution monitoring of episodic stratification events in an enclosed marine system

机译：高分辨率监测封闭海洋系统中的事件分层事件

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摘要

While hypoxic and anoxic environments have existed throughout geological time, their frequency of occurrence in shallow coastal and estuarine areas appears to be increasing. However, few data are available on the physicochemical conditions at the boundary between anoxic and normoxic layers, including the conditions required for both formation and dissipation of stratification. Advances in autonomous environmental sensing technology have produced robust sensors capable of detailed measurements under inhospitable conditions created in such environments. In this study, an autonomous sensor approach was used to compare water column properties above and below the stratification before during and after dissipation of the stratification. Further, an investigation into the effect of the stratification on sedimentation rates of organic and inorganic matter and current speeds is reported here. Lough Hyne, a seasonally stratified temperate marine lake provided favourable conditions for this study. It was shown that temperatures dropped rapidly above the oxy-thermocline while increasing rapidly below the stratification, leading to a mixing of the complete water column. This was reflected in oxygen measurements below the stratification, which rose from anoxia to normoxic conditions over the same time period. During summer, the thermocline formed a barrier to organic matter sedimentation, reducing it significantly when present, while inorganic matter sedimentation was unaffected by the presence of thermocline. It also caused a reduction in current speeds below the thermocline.
机译：尽管在整个地质时间内都存在缺氧和缺氧的环境，但它们在浅海沿岸和河口地区的发生频率似乎正在增加。然而，关于缺氧层和常氧层之间边界处的物理化学条件，包括分层形成和消散所需的条件，几乎没有可用的数据。自主环境传感技术的进步已经产生了能够在此类环境中产生的恶劣环境下进行详细测量的强大传感器。在这项研究中，使用了一种自主的传感器方法来比较分层消散之前和之后水在分层之上和之下的水柱特性。此外，这里报道了分层对有机和无机物沉降速率和当前速度的影响的研究。季节性的温带海洋湖海恩湖为这项研究提供了有利条件。结果表明，温度在氧-热线之上迅速下降，而在分层以下迅速上升，从而导致整个水塔的混合。这反映在分层以下的氧气测量中，该分层在同一时间段从缺氧上升到常氧状态。在夏季，温床形成了有机物沉降的屏障，当存在时，其会显着降低，而温床的存在不会影响无机物的沉降。这也导致电流速度降低到低于热跃线。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2013年第20期|26-33|共8页
  • 作者

    Timothy Sullivan; Stefanie Broszeit; Keith P.A. OSullivan; Rob McAllen; John Davenport; Fiona Regan;

  • 作者单位

    Marine and Environmental Sensing Technology Hub, National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Clasnevin D9, Ireland;

    School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall, Cork, Ireland;

    Hydraulics and Maritime Research Centre, University College Cork, Cork, Ireland;

    School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall, Cork, Ireland;

    School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall, Cork, Ireland;

    Marine and Environmental Sensing Technology Hub, National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Clasnevin D9, Ireland;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    hypoxia; anoxia; monitoring; organic matter; water chemistry; biogeochemical cycle; coastal waters;

    机译：缺氧缺氧监控;有机物;水化学生物地球化学循环;沿海水域;

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