Tracing the quarter‐diurnal signatures of nutrients and dissolved organic matter to evaluate their nonconservative behaviors in coastal seawaters
Tracing the quarter‐diurnal signatures of nutrients and dissolved organic matter to evaluate their nonconservative behaviors in coastal seawaters
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DOI：
10.1029/2010jg001627
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发表时间：
2011-09
影响因子：
--
通讯作者：
Lei Gao;D. Fan;Yanwei Zhang;Daoji Li;Jingong Cai
中科院分区：
文献类型：
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作者：
Lei Gao;D. Fan;Yanwei Zhang;Daoji Li;Jingong Cai
[1]2009年6月在东海杭州湾外海面进行了6次连续观测，观测时间分别为13 h和26 h。收集了物理（水流方向和速度）、水文（盐度、悬浮颗粒物（SPM）浊度、悬浮絮体的总体积和平均尺寸）和化学示踪剂（营养物质、发色溶解有机物和溶解有机氮）数据。对所有测量参数的时间序列数据进行谐波分析，包括昼夜、半日和四分之一昼夜分量。进行频谱分析，以确定三个谐波是否可以表征数据中观察到的变化。预计四分之一昼夜谐波与昼夜和半日谐波之和的振幅比将量化化学示踪剂的非保守程度。这一比例一般是较高的浑浊海水，而最低的比例发生在一个站，海水显示零浊度在整个实验。SPM和化学示踪剂之间的昼夜相位滞后被认为提供了关于SPM和化学品如何相互作用的信息。通过绘制沿着激光原位散射和透射测量获得的32个尺寸类别的季度昼夜相位谱，还探索了场过程（如再悬浮和絮凝/解聚）如何影响化学示踪剂的动力学。本研究为估算河口和沿岸海域生源要素的非保守行为以及研究物理海洋学和海洋地球化学之间的关系提供了一种有趣和潜在有用的技术。引文：Gao，L.，D.范，Y。Zhang，L. Li和J. Cai（2011），追踪营养物和溶解有机物的季度昼夜特征，以评估其在沿海海水中的非保守行为，J. Geophys。结果：116，G03015，
[1] 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. Citation: Gao, L., D. Fan, Y. Zhang, D. Li, and J. Cai (2011), Tracing the quarter‐diurnal signatures of nutrients and dissolved organic matter to evaluate their nonconservative behaviors in coastal seawaters, J. Geophys. Res., 116, G03015,