Application of in situ fluorometer to determine the distribution of fluorescent dissolved organic matter in the open ocean
Application of in situ fluorometer to determine the distribution of fluorescent dissolved organic matter in the open ocean
复制标题
应用原位荧光计测定公海中荧光溶解有机物的分布
DOI：
10.1016/j.marchem.2015.06.025
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发表时间：
2015
期刊：
影响因子：
3
通讯作者：
and H. Saito
中科院分区：
文献类型：
--
作者：
Yamashita;Y.;C.-J. Lu;H. Ogawa;J. Nishioka;H. Obata;and H. Saito
应用原位荧光仪测定海洋荧光有机物（FOM）的高分辨率垂直剖面，加强了对海洋荧光有机物（FOM）分布的研究，并有助于更好地了解FOM的环境动力学，包括近海陆源FOM的分布/命运。在这里，我们应用了一种市售的原位FOM荧光计，该荧光计连接到电导率、温度和深度（CTD）传感器，并带有旋转多采样系统，以确定海洋环境中FOM的完整垂直剖面。结果表明，温度标准化对于产生可靠的深度剖面是必要的，并在使用台式荧光计进行校准之前进行。校正了巡航期间荧光计响应的差异后，原位荧光计的校准输出与表观氧利用率呈线性相关。本研究结果表明：(1)安装在CTD系统上的原位FOM荧光计可用于研究开放海域FOM的分布；(2)温度标准化和适当的校准对于评估开放海域FOM的分布至关重要。虽然我们使用了窗口滤波器（输出的加权平均值）来克服原位荧光仪输出的低信噪比，但在开放海洋研究中，原位荧光仪的信噪比有望提高。
The application of in situ fluorometers to determine the high resolution vertical profiles of oceanic fluorescent organic matter (FOM) enhances the study of FOM distributions in the open ocean and will lead to better understandings of the environmental dynamics of FOM, including the distribution/fate of terrestrial FOM in offshore waters. Here, we applied a commercially available in situ FOM fluorometer that was connected to a conductivity, temperature and depth (CTD) sensors with a carousel multi-sampling system to determine full vertical profiles of the FOM in oceanic environments. It was shown that temperature standardization was necessary to produce robust depth profiles and was performed preceding calibration with a benchtop fluorometer. The calibrated output of the in situ fluorometer was linearly related to apparent oxygen utilization when corrected for differences in fluorometer response over the length of the cruise. The results of this study indicated that (1) in situ FOM fluorometers that are mounted on CTD systems can be used to study the distribution of FOM in the open ocean, and (2) temperature standardization and appropriate calibration are crucial to evaluate the distribution of FOM in the open ocean. Although we used a window filter (weighted average of the output) to overcome the low S/N ratio of the output of the in situ fluorometer, better S/N ratios for in situ fluorometers are expected for open ocean studies.