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Retrieval of chlorophyll fluorescence from reflectance spectra through polarization discrimination: modeling and experiments

机译：通过偏振辨别从反射光谱中检索叶绿素荧光：建模和实验

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The polarization discrimination technique we recently developed, shows that it is possible to separate the elastic scattering and the chlorophyll fluorescence signal from the water-leaving radiance by making use of the fact that the elastically scattered components are partially polarized, while the fluorescence signal is unpolarized. The technique has been shown to be applicable to a wide range of water conditions. We present an extension of experimental and analytical results, which serve to define the scope of this technique and its range of applicability. A new analysis, based on vector radiative transfer computations, and on laboratory and field measurements on eastern Long Island and in the Chesapeake Bay, shows that the technique is generally effective for both open ocean and coastal waters, but that it is limited if the ocean bottom albedo and/or multiple scattering due to very high mineral particle concentrations result in depolarizing the water-leaving radiance. In addition, we show that in contrast with the polarization-based retrieval, the traditional method of extracting fluorescence height using the baseline method can give significant errors, particularly for coastal waters where it strongly overestimates the fluorescence values.
机译：我们最近开发的极化鉴别技术表明，利用弹性散射的成分是部分极化而荧光信号是非极化的这一事实，可以将弹性散射和叶绿素荧光信号与出水辐射率分开。 。该技术已显示适用于各种水质条件。我们提供了实验和分析结果的扩展，它们有助于定义该技术的范围及其适用范围。根据矢量辐射传输计算以及对长岛东部和切塞皮克湾的实验室和野外测量进行的一项新分析表明，该技术通常对开阔海洋和沿海水域都有效，但是如果海洋底部反照率和/或由于非常高的矿物质颗粒浓度而造成的多次散射会导致除水辐射的极化。此外，我们表明，与基于偏振的检索相反，使用基线方法提取荧光高度的传统方法会产生明显的误差，特别是对于沿海水域，该方法强烈高估了荧光值。

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