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首页> 外文期刊>Applied optics >Contribution of water-leaving radiances to multiangle, multispectral polarimetric observations over the open ocean: bio-optical model results for case 1 waters
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Contribution of water-leaving radiances to multiangle, multispectral polarimetric observations over the open ocean: bio-optical model results for case 1 waters

机译：留水辐射对公海多角度，多光谱极化观测的贡献：案例1水域的生物光学模型结果

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摘要

Multiangle, multispectral photopolarimetry of atmosphere-ocean systems provides the fullest set of remote sensing information possible on the scattering properties of aerosols and on the color of the ocean. Recent studies have shown that inverting such data allows for the potential of separating the retrieval of aerosol properties from ocean color monitoring in the visible part of the spectrum. However, the data in these studies were limited to those principal plane observations where the polarization of waterleaving radiances could be ignored. Examining similar potentials for off-principal plane observations requires the ability to assess realistic variations in both the reflectance for and bidirectionality of polarized water-leaving radiances for such viewing geometries. We provide hydrosol models for use in underwater light scattering computations to study such variations. The model consists of two components whose refractive indices resemble those of detritus-minerallike and planktonlike particles, whose size distributions are constrained by underwater light linear polarization signatures, and whose mixing ratios change as a function of particulate backscattering efficiency. Multiple scattering computations show that these models are capable of reproducing realistic underwater light albedos for wavelengths ranging from 400 to 600 nm, and for chlorophyll a concentrations ranging from 0.03 to 3.0 mg/m~(3). Numerical results for spaceborne observations of the reflectance for total and polarized water-leaving radiances are provided as a function of polar angles, and the change in these reflectances with wavelength, chlorophyll a concentration, and hydrosol model are discussed in detail for case 1 (open ocean) waters.
机译：海洋系统的多角度，多光谱光偏振法可提供有关气溶胶的散射特性和海洋颜色的最完整的遥感信息。最近的研究表明，对此类数据进行反演可以潜在地从光谱可见部分的海洋颜色监测中分离出气溶胶特性的检索。但是，这些研究中的数据仅限于那些可以忽略分水辐射的极化的主平面观测。检查主平面外观测的类似潜力要求能够评估这种观看几何形状的极化水辐射的反射率和双向性的实际变化。我们提供用于水下光散射计算的水溶胶模型来研究此类变化。该模型由两个组成部分组成，这些组成部分的折射率类似于碎屑矿物质和浮游生物颗粒的折射率，其尺寸分布受水下光线性偏振特征的约束，并且其混合比随颗粒反向散射效率而变化。多次散射计算表明，这些模型能够再现波长范围为400至600 nm，叶绿素a浓度范围为0.03至3.0 mg / m〜（3）的真实水下反照率。提供了星载观测的总和极化出水辐射率的反射率的数值结果，它是极角的函数，并且针对情况1（开放，详细讨论了这些反射率随波长，叶绿素a浓度和水溶胶模型的变化）。海洋）水域。

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