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首页> 外文期刊>Marine Chemistry >The dynamics of absorption coefficients of CDOM and particles in the St. Lawrence estuarine system: Biogeochemical and physical implications
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The dynamics of absorption coefficients of CDOM and particles in the St. Lawrence estuarine system: Biogeochemical and physical implications

机译：圣劳伦斯河口系统中CDOM和颗粒吸收系数的动力学：生物地球化学和物理意义

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摘要

Absorption spectra of chromophoric dissolved organic matter (CDOM) and particles were obtained in May 2007 in the St. Lawrence estuary (SLE, Canada), the northwestern Gulf of St. Lawrence (NWG), and the Saguenay Fjord (CDOM only), the main tributary of the SLE. CDOM absorption generally decreased downstream and with depth and showed an inverse relationship to tidal cycles. Phytoplankton absorption in surface water of the SLE increased seaward while non-algal particle absorption trended oppositely; both variables declined with depth. Surface water CDOM absorption surpassed particle absorption in the SLE while phytoplankton absorption dominated in the NWG. Elevated non-algal and CDOM absorption were found in the turbidity maximum zone near the head of the SLE. Enriched CDOM absorption also occurred in the bottom water of the lower SLE and NWG. The spectral slope ratio of CDOM absorption, defined as the ratio of the spectral slope between 275 and 295 nm to that between 350 and 400 nm, was confirmed to be an indicator of the source and molecular weight of CDOM. This surrogate functionality, however, failed for absorption spectra exhibiting shoulders in short ultraviolet wavelengths observed in deep waters of the SLE and NWG. CDOM absorption mainly displayed conservative mixing behavior in both the SLE and the Saguenay Fjord. CDOM was employed to trace the source identity of the Fjord's deepwater. It was found that the marine end member of the Fjord's deepwater possessed a salinity of 32.92 and a temperature of ca. 1 ℃ and originated from the intermediate cold layer of the lower SLE. The marine end member contributed 94% of the deepwater by volume while freshwater mainly flown from the Saguenay River supplied the remaining 6%. Implications of our results for remote sensing-based assessments of primary productivity, surface water circulation, and water column photochemistry in the SLE are also discussed.
机译：发色溶解性有机物（CDOM）和颗粒的吸收光谱于2007年5月在圣劳伦斯河口（SLE，加拿大），西北圣劳伦斯湾（NWG）和萨格奈峡湾（仅CDOM）获得。 SLE的主要支流。 CDOM吸收通常在下游并随深度而降低，并与潮汐周期成反比关系。 SLE地表水中浮游植物的吸收向海增加，而非藻类颗粒的吸收则相反。两个变量都随深度而下降。在SLE中，地表水CDOM的吸收量超过了颗粒物的吸收量，而在NWG中，浮游植物的吸收量占主导地位。在SLE头部附近的最大浊度区域发现非藻类和CDOM的吸收增加。下部SLE和NWG的底部水中也发生了丰富的CDOM吸收。 CDOM吸收的光谱斜率比，其定义为275至295nm之间的光谱斜率与350至400nm之间的光谱斜率之比，被证实是CDOM的来源和分子量的指标。但是，这种替代功能对于在SLE和NWG的深水中观察到的短紫外波长的吸收光谱显示失败。在SLE和Saguenay峡湾中，CDOM的吸收主要表现出保守的混合行为。 CDOM被用来追踪峡湾深水的来源身份。据发现，峡湾深水的海洋末端成员的盐度为32.92，温度大约为190。 1℃，起源于下SLE的中冷层。海上端部成员贡献了94％的深水，而主要来自萨格奈河的淡水提供了剩余的6％。还讨论了我们的结果对SLE中初级生产力，地表水循环和水柱光化学的基于遥感的评估的意义。

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