Retrieval of chlorophyll fluorescence from reflectance spectra through polarization discrimination: modeling and experiments
Retrieval of chlorophyll fluorescence from reflectance spectra through polarization discrimination: modeling and experiments
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DOI：
10.1364/ao.45.005568
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发表时间：
2006-08-01
期刊：
影响因子：
1.9
通讯作者：
Ahmed, Samir
中科院分区：
文献类型：
--
作者：
Gilerson, Alexander;Zhou, Jing;Ahmed, Samir
我们最近发展的偏振鉴别技术表明，利用弹性散射分量部分偏振而荧光信号非偏振的事实，可以从离水辐射中分离弹性散射和叶绿素荧光信号。该技术已被证明适用于广泛的水条件。我们提出了一个扩展的实验和分析结果，这有助于定义这种技术的范围和适用范围。一项新的分析，矢量辐射传输计算的基础上，在长岛东部和切萨皮克湾的实验室和现场测量，表明该技术是普遍有效的开放海洋和沿海沃茨，但它是有限的，如果海底的散射和/或多重散射由于非常高的矿物颗粒浓度导致去极化的水离开的辐射。此外，我们表明，在基于偏振的检索相比，传统的方法提取荧光高度使用基线法可以给显着的错误，特别是沿海沃茨，它强烈高估的荧光值。(C)2006年美国光学学会。
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. (C) 2006 Optical Society of America.