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首页> 美国政府科技报告 >Optical Absorption Spectra of Waters from the Orinoco River Outflow: TerrestrialInput of Colored Organic Matter to the Caribbean. (Reannouncement with New Availability Information)
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Optical Absorption Spectra of Waters from the Orinoco River Outflow: TerrestrialInput of Colored Organic Matter to the Caribbean. (Reannouncement with New Availability Information)

机译：奥里诺科河流出水域的光吸收光谱：有色有机物对加勒比地区的陆地输入。 （重新公布新的可用性信息）

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An extensive series of optical absorption spectra were recorded for waters in theeastern Caribbean Sea, the Gulf of Paria, and the Orinoco River Estuary during the high-flow period of the Orinoco River in the Fall of 1988. Evidence for high levels of dissolved, colored organic matter (COM) was found throughout the eastern Caribbean, with these levels increasing substantially at stations nearer the Gulf of Paria and the Orinoco River. The dependence of the absorption at 300 nm (alpha 300) on salinity exhibited conservative mixing behavior for transects through the Gulf of Paria. In contrast, transects through the Orinoco Estuary revealed that alpha 300 remained approximately constant or slightly increased with increasing salinity up to 27 deg./00, after which it decreased linearly with increasing salinity. This nonconservative behavior was not produced by COM release from suspended particulate matter at higher salinity, nor did it appear to originate from the sediment. Below 30 deg./00, the slopes of the log-linearized absorption spectra were independent of salinity (0.0140 nm-1). At higher salinities, the slopes apparently increased, suggesting that the COM is modified. Based on specific absorption coefficients measured for COM isolated

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