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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Tracing the quarter-diurnal signatures of nutrients and dissolved organic matter to evaluate their nonconservative behaviors in coastal seawaters
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Tracing the quarter-diurnal signatures of nutrients and dissolved organic matter to evaluate their nonconservative behaviors in coastal seawaters

机译：追踪养分和溶解有机物的四分之一昼夜特征，以评估其在沿海海水中的非保守行为

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In June 2009, six consecutive observations with duration times of 13 h or 26 h were performed at the sea surface of outer Hangzhou Bay in the East China Sea. Physical (current direction and velocity), hydrological (salinity, suspended particulate matter (SPM) turbidity, total volume and mean size of suspended flocs), and chemical tracer (nutrients, chromophoric dissolved organic matter, and dissolved organic nitrogen) data were collected. Harmonic analysis that included diurnal, semidiurnal, and quarter-diurnal constituents was conducted on time series data for all of the parameters measured. Spectral analysis was performed to determine whether the three harmonics could characterize the variations observed in the data. The amplitude ratio of quarter-diurnal harmonic to the sum of diurnal and semidiurnal harmonics was expected to quantify the nonconservative extent of the chemical tracers. This ratio generally was higher in turbid seawater, whereas the lowest ratio occurred at a station where the seawater displayed zero turbidity throughout the experiment. The quarter-diurnal phase lags between SPM and chemical tracers were believed to provide information about how SPM and chemicals interact. How field processes such as resuspension and flocculation/disaggregation affected the kinetics of the chemical tracers also was explored by plotting the quarter-diurnal phase spectra along the 32 size classes obtained from Laser In Situ Scattering and Transmissometry measurements. This study provided an interesting and potentially useful technique to estimate the nonconservative behaviors of biogenic elements and to study the relationships between the fields of physical oceanography and biogeochemistry in estuarine and coastal seawaters.
机译：2009年6月，在东海杭州湾外海面进行了六次连续观测，持续时间分别为13 h或26 h。收集了物理（电流方向和速度），水文（盐度，悬浮颗粒物（SPM）浊度，悬浮絮状物的总体积和平均大小）和化学示踪剂（营养物，发色溶解性有机物和溶解性有机氮）数据。对所有测量参数的时间序列数据进行了包括日，半日和四分之一日组成部分的谐波分析。进行光谱分析以确定三个谐波是否可以表征数据中观察到的变化。预期四分之一日谐波与日和半日谐波之和的振幅比可量化化学示踪剂的非保守程度。在浑浊的海水中，该比率通常较高，而最低比率发生在整个实验过程中海水显示零浑浊度的站点。据信，SPM和化学示踪剂之间的四分之一昼夜相差可提供有关SPM和化学物如何相互作用的信息。还通过绘制沿从激光原位散射和透射测量获得的32个尺寸类别的四分之一昼夜相谱图，探索了诸如重悬和絮凝/分解等野外过程如何影响化学示踪剂的动力学。这项研究提供了一种有趣的且可能有用的技术，以估计生物成因元素的非保守行为，并研究河口和沿海海水中的物理海洋学和生物地球化学领域之间的关系。

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