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首页> 外文期刊>Environmental Science & Technology >Temporal Evolution and Variability of Dissolved Inorganic Nitrogen in Beach Pore Water Revealed Using Radon Residence Times
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Temporal Evolution and Variability of Dissolved Inorganic Nitrogen in Beach Pore Water Revealed Using Radon Residence Times

机译：利用Rad停留时间揭示海滩孔隙水中溶解性无机氮的时间演变和变异性

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摘要

We coupled measurements of beach pore water residence time, determined using the radioisotopic tracer ~(222)Rn, with dissolved carbon and nitrogen chemistry to identify the temporal evolution and variability of dissolved inorganic nitrogen (DIN) concentrations in beach pore water along the Santa Barbara, California coastline. Pore water dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) ratios (DOC.-TDN) were negative exponentially correlated with residence time. Mean pore water residence times were positively correlated with tidal amplitudes, and ranged from 4.4 to 6.4 days. We used this range in mean residence times to model radon residence time distributions (RTDs), and integrated them with modeled DIN vs residence time relationships (DIN-temporal evolution, or DIN-te curves) to derive volume-weighted mean (VWM) DIN concentrations. We observed 1.2-fold and S.2-foId differences (20% and 420% increases) in VWM DIN concentrations over the range in modeled RTDs and DIN-te curves, respectively, and a maximum 6.4-fold difference (540% increase) in VWM DIN concentrations for an interactive shift in the RTD and the DIN-te curve. Our study suggests that accounting for temporal variability in the RTD and DIN concentration of pore water is necessary to obtain more accurate estimates of DIN delivery to coastal oceans.
机译：我们将使用放射性同位素示踪剂〜（222）Rn确定的海滩孔隙水停留时间与溶解的碳和氮化学方法结合起来，以确定沿圣塔芭芭拉海滩孔隙水中溶解的无机氮（DIN）浓度的时间变化和变异性。 ，加利福尼亚的海岸线。孔隙水溶解有机碳（DOC）和总溶解氮（TDN）比（DOC.-TDN）与停留时间呈负指数相关。平均孔隙水停留时间与潮汐振幅呈正相关，范围为4.4至6.4天。我们在平均停留时间范围内使用此范围来建模ra停留时间分布（RTD），并将它们与模型化的DIN与停留时间关系（DIN时间演变或DIN-te曲线）进行积分，以得出体积加权平均值（VWM）DIN浓度。我们在模型RTD和DIN-te曲线范围内分别观察到VWM DIN浓度的1.2倍和S.2-foId差异（增加20％和420％），最大差异为6.4倍（增加540％）。以VWM DIN浓度表示，RTD和DIN-te曲线发生交互变化。我们的研究表明，考虑到RTD和孔隙水的DIN浓度随时间的变化，对于更准确地估计向沿海海洋的DIN排放是必要的。

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  • 来源
    《Environmental Science & Technology》 |2014年第24期|14211-14218|共8页
  • 作者

    Blair M. Goodridge; John M. Melack;

  • 作者单位

    Bren School of Environmental Science & Management, University of California, Santa Barbara, Santa Barbara, California 93106, United States;

    Bren School of Environmental Science & Management, University of California, Santa Barbara, Santa Barbara, California 93106, 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);
  • 原文格式 PDF
  • 正文语种 eng
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