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首页> 外文期刊>Estuarine Coastal and Shelf Science >CDOM and its contribution to the underwater light climate of a shallow, microtidal estuary in south-western Australia
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CDOM and its contribution to the underwater light climate of a shallow, microtidal estuary in south-western Australia

机译：CDOM及其对澳大利亚西南部浅潮微河口水下光气候的贡献

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摘要

Light attenuation (K_d) of photosynthetically active radiation (PAR) by chromophoric dissolved organic matter (CDOM), total suspended solids (TSS) and chlorophyll a (Chl a) were measured at nine stations along an estuarine gradient in the Swan River, Western Australia, over 15 months. There were strong spatial gradients associated with the marine-freshwater transition along the 32 km of estuary sampled, as well as seasonal gradients mainly associated with rainfall, ～80% of which occurs between May and September. CDOM absorbances at 440 nm reached a maximum of 10.9 m~(-1) with the freshwater inflow but concentrations of suspended matter remained low throughout the sampling period (1.0-21.0 mg l~(-1)) under the diurnal tides of the estuary. CDOM was the dominant constituent of K_d and a stepwise multiple regression showed that 66% (p < 0.0001) of the variation in K_d can be explained by CDOM and an additional 8% (p < 0.0001) by TSS. As a consequence of this result, analysis into the influence of river discharge rates on CDOM absorbance levels was examined for 2002 using data collected during this study, and for 2000 and 2001 using historical dissolved organic carbon (DOC) and river discharge data. The outcome of this analysis infers that greater river discharge rates result in increased CDOM absorbances in the Swan River estuary.
机译：在西澳大利亚州天鹅河沿河口梯度的9个站点测量了发色溶解有机物（CDOM），总悬浮固体（TSS）和叶绿素a（Chl a）对光合有效辐射（PAR）的光衰减（K_d）。 ，超过15个月。沿32公里的河口采样区域存在着与海洋-淡水过渡有关的强空间梯度，以及主要与降雨有关的季节性梯度，其中约80％发生在5月至9月之间。随着淡水的流入，CDOM在440 nm处的吸光度最大达到10.9 m〜（-1），但在河口的日潮下，整个采样期间的悬浮物浓度仍较低（1.0-21.0 mg l〜（-1））。 。 CDOM是K_d的主要成分，逐步多元回归表明，CDOM可以解释K_d变化的66％（p <0.0001），而TSS可以解释8％（p <0.0001）。作为此结果的结果，使用本研究期间收集的数据对2002年的河流排放速率对CDOM吸收水平的影响进行了分析，并使用历史溶解有机碳（DOC）和河流排放数据对2000年和2001年进行了分析。该分析的结果表明，较高的河流流量导致天鹅河河口的CDOM吸收增加。

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