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首页> 外文期刊>Estuarine Coastal and Shelf Science >Distributions of dissolved organic carbon (DOC) and chromophoric dissolved organic matter (CDOM) in coastal waters of the northern Tyrrhenian Sea (Italy)
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Distributions of dissolved organic carbon (DOC) and chromophoric dissolved organic matter (CDOM) in coastal waters of the northern Tyrrhenian Sea (Italy)

机译：第勒尼安海北部（意大利）沿海水域的溶解有机碳（DOC）和发色溶解有机物（CDOM）的分布

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An investigation on the distribution of dissolved organic carbon (DOC) and chromophoric dissolved organic matter (CDOM) in coastal waters of the northern Tyrrhenian Sea, affected by the Arno River discharge, is reported and discussed. Data refer to a survey carried out aboard of the R/V Urania in January 2000. The study period was characterized by a rather low river discharge due to the particularly calm meteorological conditions. The river plume region extended to north of the Arno delta and it was confined to the inner shelf with depths less than 40 m and salinities <38.1. Surface DOC concentrations ranged in a narrow interval of values (56- 76 μM). Plume waters exhibited the highest levels of DOC (>70 μM). These values were slightly higher than those found in the outer shelf (56- 66 μM) which in turn, were generally comparable to those reported in the literature for open sea waters of different regions of the Mediterranean Sea. The distribution of CDOM was described by the two components of fluorescent material, i.e., the "protein-like" (F_(n(280))) and the "humic-like" (F_(n(355))), respectively, characterized by different spectral regions for both excitation and emission. The F_(n(355))) signature decreased towards the north and west generally mirroring the spatial pattern of salinity, temperature and DOC. On the contrary, the distribution of F_(n(280))) differed from that of F_(n(355)) without any apparent relationship with the parameters above cited. This behavior supports the hypothesis that the "protein-like" fluorescent material could be released to the coastal waters by the local activity of planktonic organisms. Conversely, DOC was conservatively exported through the plume to the coastal waters and, similarly, F_(n(355)) appeared largely controlled by a conservative mixing. The correlation between DOC and F_(n(355)) (r~2 = 0.78) represents a further confirmation of the terrestrial origin of DOC in the plume region. Vertical profiles of DOC, F_(n(280)) and F_(n(355)) and those of the specific fluorescence, F_(s(280)), and F_(s(355)), in stations located off the shelf, showed differences between northern and southern stations, suggesting a different composition of DOC in the two regions. Finally, although these data refer to a single survey, they represent the first simultaneous DOC and CDOM view on the influence of the Arno River to the carbon cycle in an estuarine Mediterranean region.
机译：报告并讨论了受阿尔诺河排放影响的第勒尼安海北部沿海水域溶解有机碳（DOC）和发色溶解有机物（CDOM）的分布情况。数据指的是2000年1月在R / V Urania上进行的一项调查。由于气象条件特别平静，研究期的河流排泄量较低。羽状流区域延伸到亚诺河三角洲的北部，并被限制在深度小于40 m且盐度小于38.1的内层架上。表面DOC的浓度范围狭窄（56-76μM）。羽水表现出最高的DOC水平（> 70μM）。这些值略高于在外部架子（56-66μM）中发现的值，而后者通常与文献中报道的地中海不同地区的公海可比。 CDOM的分布由荧光物质的两个成分分别描述，即“类蛋白质”（F_（n（280）））和“类腐殖质”（F_（n（355））），其特征在于激发和发射的不同光谱区域。 F_（n（355）））信号朝北和向西减小，大致反映了盐度，温度和DOC的空间格局。相反，F_（n（280）））的分布与F_（n（355））的分布不同，与上面引用的参数没有任何明显的关系。这种行为支持这样的假说，即“蛋白样”荧光物质可通过浮游生物的局部活动释放到沿海水域。相反，DOC是通过烟羽保守地出口到沿海水域的，类似地，F_（n（355））似乎在很大程度上受到保守混合的控制。 DOC与F_（n（355））（r〜2 = 0.78）之间的相关性进一步证实了羽状区域中DOC的地面起源。在架子附近的工作站中，DOC，F_（n（280））和F_（n（355））的垂直轮廓以及特定荧光的F_（s（280））和F_（s（355））的垂直轮廓表示南北站之间存在差异，这表明这两个地区的DOC组成不同。最后，尽管这些数据仅涉及一次调查，但它们代表了关于阿尔诺河对河口地中海地区碳循环的影响的第一个同时的DOC和CDOM视图。

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