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The Variations In Optical Properties Of Cdom Throughout An Algal Bloom Event

机译：整个藻华事件中Cdom光学特性的变化

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For studies in bio-optical oceanography, visible light properties by classes of dissolved organic matter should be characterized. The regional adjustment of model parameters is one approach which is being widely used to refine bio-optical models. In the present study, buoy and laboratory data were acquired, and during the 15-day observation period an algal bloom event occurred. The absorption coefficient of CDOM at 443 run, a_g(443), changed in the range of 0.09-0.35 m~(-1) and 0.1-0.34 m~(-1) for two depths, 0.32 m and 2.3 m., respectively, throughout the entire period. CDOM absorption was larger for bloom conditions than for non-bloom conditions. In addition, the fraction of CDOM in total absorption was higher during the bloom event than that of non-bloom conditions. The spectral slope of CDOM absorption, S_g, regressed over 400-500 nm, ranged from 0.015 to 0.0185 nm~(-1) with an average of 0.0166 nm~(-1). CDOM fluorescence intensity (Fcdom) was obtained using an internal Raman standard and varied over the range of 467.44-1538.23 in relative units. Variations in Fcdom showed a similar pattern to that of CDOM absorption. A robust non-linear relationship between Fcdom and CDOM absorption was found, with a correlation coefficient of 0.893, throughout the whole observation. An attempt to describe S_g with absorption showed a promising consequence that can be described with a negative correlation during the bloom, however, without any distinguishable tendency for non-bloom time span. A two-band ratio algorithm was also carried out for retrieving CDOM absorption. The variations in optical properties of CDOM may be related to the complicated environment in the estuarine waters, which may result from different sources of CDOM.
机译：对于生物光学海洋学的研究，应表征按溶解有机物类别划分的可见光特性。模型参数的区域调整是一种广泛用于改进生物光学模型的方法。在本研究中，获得了浮标和实验室数据，在15天的观察期内发生了藻华事件。 CDOM在443 run处的吸收系数a_g（443）在两个深度0.32 m和2.3 m分别在0.09-0.35 m〜（-1）和0.1-0.34 m〜（-1）的范围内变化，在整个期间。盛花条件下的CDOM吸收大于非盛花条件下的CDOM吸收。此外，在开花期间，CDOM在总吸收中的比例要高于非开花条件。 CDOM吸收的光谱斜率S_g在400-500 nm范围内回归，范围为0.015至0.0185 nm〜（-1），平均为0.0166 nm〜（-1）。使用内部拉曼标准品获得CDOM荧光强度（Fcdom），其相对单位范围为467.44-1538.23。 Fcdom的变化显示出与CDOM吸收相似的模式。在整个观察过程中，发现Fcdom与CDOM吸收之间存在稳健的非线性关系，相关系数为0.893。用吸收来描述S_g的尝试显示出有希望的结果，该结果可以在开花期间以负相关来描述，但是对于非开花时间跨度没有任何明显的趋势。还执行了两个频带比率算法来检索CDOM吸收。 CDOM光学特性的变化可能与河口水域复杂的环境有关，这可能是由于CDOM的来源不同所致。

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