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首页> 外文期刊>Water resources research >Deconstructing the Effects of Flow on DOC, Nitrate, and Major Ion Interactions Using a High-Frequency Aquatic Sensor Network
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Deconstructing the Effects of Flow on DOC, Nitrate, and Major Ion Interactions Using a High-Frequency Aquatic Sensor Network

机译：使用高频水生传感器网络解构流动对DOC，硝酸盐和主要离子相互作用的影响

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摘要

Streams provide a physical linkage between land and downstream river networks, delivering solutes derived from multiple catchment sources. We analyzed high-frequency time series of stream solutes to characterize the timing and magnitude of major ion, nutrient, and organic matter transport over event, seasonal, and annual timescales as well as to assess whether nitrate (NO2-) and dissolved organic carbon (DOC) transport are coupled in catchments, which would be expected if they are subject to similar biogeochemical controls throughout the watershed. Our data set includes in situ observations of NO2-, fluorescent dissolved organic matter (DOC proxy), and specific conductance spanning 2-4 years in 10 streams and rivers across New Hampshire, including observations of nearly 700 individual hydrologic events. We found a positive response of NO2- and DOC to flow in forested streams, but watershed development led to a negative relationship between NO2- and discharge, and thus a decoupling of the overall NO2- and DOC responses to flow. On event and seasonal timescales, NO2- and DOC consistently displayed different behaviors. For example, in several streams, FDOM yield was greatest during summer storms while NO2- yield was greatest during winter storms. Most streams had generalizable storm NO2- and DOC responses, but differences in the timing of NO2- and DOC transport suggest different catchment sources. Further, certain events, including rain-on-snow and summer storms following dry antecedent conditions, yielded disproportionate NO2- responses. High-frequency data allow for increased understanding of the processes controlling solute variability and will help reveal their responses to changing climatic regimes.
机译：溪流在陆地和下游河网之间提供了物理联系，输送了来自多个集水源的溶质。我们分析了流质的高频时间序列，以表征事件，季节和年度时间范围内主要离子，营养物和有机物运输的时间和大小，并评估硝酸盐（NO2-）和溶解的有机碳（ DOC）的运输与集水区耦合，如果在整个流域中对它们进行类似的生物地球化学控制，这是可以预期的。我们的数据集包括在新罕布什尔州的10条河流和河流中对NO2-，荧光溶解的有机物（DOC代理）和跨度为2-4年的比电导的原位观测，包括近700个单独的水文事件的观测。我们发现森林流中NO2-和DOC对流量呈正响应，但集水区发展导致NO2-与排放量之间呈负相关，因此，总NO2-和DOC对流量的响应解耦。在事件和季节时间尺度上，NO2-和DOC始终显示出不同的行为。例如，在几条河流中，夏季风暴期间的FDOM产量最高，而冬季风暴期间的NO2产量最高。大多数流具有普遍的风暴NO2-和DOC响应，但NO2-和DOC传输时间的差异表明集水源不同。此外，某些事件，包括雪前降雨和干旱前期条件后的夏季风暴，产生了不成比例的NO2-响应。高频数据可以使人们对控制溶质变异性的过程有更多的了解，并有助于揭示它们对变化的气候状况的反应。

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  • 来源
    《Water resources research》 |2017年第12期|10655-10673|共19页
  • 作者

    Koenig L. E.; Shattuck M. D.; Snyder L. E.; Potter J. D.; McDowell W. H.;

  • 作者单位

    Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA;

    Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA;

    Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA;

    Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA;

    Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA;

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