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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Sources and transformations of chromophoric dissolved organic matter in the Neponset River Watershed
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Sources and transformations of chromophoric dissolved organic matter in the Neponset River Watershed

机译：Neponset河流域发色溶解性有机物的来源和转化

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The major source of chromophoric dissolved organic matter (CDOM) in coastal waters is often terrestrial dissolved organic matter originating in coastal watersheds and delivered to the ocean by rivers or streams. While studies of carbon cycling in large rivers dominate the literature, small rivers deliver the bulk of the freshwater to coastal waters (~60%). However, the variability of organic matter fluxes in small rivers requires high spatial and temporal resolution measurements to adequately represent the processes controlling distributions and fluxes. In this study, CDOM was measured monthly for 2 years at 15 sampling sites throughout a small, coastal, urban watershed (~300 km2), the Neponset River Watershed, and CDOM variability was found to depend on land use type, discharge/precipitation, and growing degree days (temperature). Forest, wetland, residential, industrial, and golf course CDOM end-members were measured and differentiated using CDOM fluorescence, CDOM absorbance, absorbance slopes, total organic carbon and total nitrogen, and photo- and biological lability. Simple statistical models of CDOM end-member behavior could explain 40-70% of the observed seasonal variability. Using these simple relationships, trends in total CDOM loading behavior can be predicted under various scenarios of land use change and global warming. Overall, detailed measurements of CDOM throughout the Neponset River Watershed yield new insights into the watershed processes that affect terrestrial CDOM delivery to coastal oceans.
机译：沿海水域发色溶解有机物（CDOM）的主要来源通常是陆地溶解有机物，其起源于沿海集水区，并通过河流或溪流输送到海洋。尽管有关大型河流中碳循环的研究在文献中占主导地位，但小型河流将大部分淡水输送到沿海水域（约60％）。然而，小河中有机质通量的变化要求进行高时空分辨率测量，以充分体现控制分布和通量的过程。在这项研究中，在一个小型沿海城市流域（约300平方公里），Neponset河流域的15个采样点上，对CDOM进行了每月2年的测量，发现CDOM的可变性取决于土地利用类型，流量/降水，和生长度数天（温度）。使用CDOM荧光，CDOM吸光度，吸光度斜率，总有机碳和总氮以及光和生物不稳定性来测量和区分森林，湿地，住宅，工业和高尔夫球场的CDOM末端成员。 CDOM最终成员行为的简单统计模型可以解释所观察到的季节性变化的40-70％。使用这些简单的关系，可以在各种土地利用变化和全球变暖的情况下预测总CDOM加载行为的趋势。总体而言，对整个Neponset河流域的CDOM进行详细测量，可以对影响陆地CDOM向沿海海洋输送的流域过程提供新的见解。

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