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首页> 外文期刊>Environmental Science & Technology >Hydrologic Controls on Nutrient Cycling in an Unconfirined Coastal Aquifer
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Hydrologic Controls on Nutrient Cycling in an Unconfirined Coastal Aquifer

机译：未确定的沿海含水层中养分循环的水文控制

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摘要

Groundwater is an important pathway for terrestrially derived nutrients to enter the coastal ocean. In coastal aquifers, groundwater transits the subterranean estuary, a region of sharp gradients in redox conditions and the availability of reactants. In one such system (Waquoit Bay, MA, USA), we observed more than a doubling of the groundwater-associated nitrogen flux to surface water during the summer compared to winter due primarily to a reduction in nitrogen attenuation within the subterranean estuary. Because marine groundwater intrusion has been shown to increase during the summer, we calculate a greater contribution of recycled nutrients from the coastal ocean to the subterranean estuary. We posit that the longer residence times within the subterranean estuary during the winter, which would result from reduced marine groundwater circulation, allow oxygen depletion of the groundwater, creating a favorable environment for important nutrient transformations such as nitrification, denitrincation, and anammox. The timing of nutrient delivery to the coastal ocean has important implications for coastal marine ecology including the potential development of harmful algal blooms.
机译：地下水是陆生营养进入沿海海洋的重要途径。在沿海含水层中，地下水流经地下河口，这是氧化还原条件下陡峭梯度的区域以及反应物的可用性。在一个这样的系统中（美国马萨诸塞州，沃奎特湾），我们观察到夏季与冬季相比，与地下水相关的氮通量比冬季增加了一倍以上，这主要是由于地下河口内氮的衰减减少了。由于夏季海水入侵的情况已显示出增加的趋势，因此我们计算了从沿海海洋到地下河口的循环养分的更大贡献。我们认为，冬季冬季地下河口中的滞留时间较长，这是由于海洋地下水循环减少导致地下水耗氧，从而为重要的养分转化（例如硝化，反硝化和厌氧氨氧化）创造了有利的环境。养分向沿海海洋的输送时间对沿海海洋生态学（包括有害藻华的潜在发展）具有重要意义。

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  • 来源
    《Environmental Science & Technology》 |2014年第24期|14178-14185|共8页
  • 作者

    Meagan Eagle Gonneea; Matthew A. Charette;

  • 作者单位

    Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, United States,U.S. Geological Survey, Woods Hole Coastal and Marine Science Center, Woods Hole, MA 02543, USA;

    Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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