Effects of ocean particles on the upwelling radiance and polarized radiance in the atmosphere-ocean system
Effects of ocean particles on the upwelling radiance and polarized radiance in the atmosphere-ocean system
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DOI：
10.1007/s00376-015-4222-8
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发表时间：
2015-07
影响因子：
5.8
通讯作者：
C. Shi;Pucai C. Wang;T. Nakajima;Y. Ota;S. Tan;G. Shi
中科院分区：
文献类型：
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作者：
C. Shi;Pucai C. Wang;T. Nakajima;Y. Ota;S. Tan;G. Shi
基于一个大气-海洋系统的矢量辐射传输模式，在0.380 ~ 0.865 μm波长范围内研究了海洋组分对辐射过程的影响，包括偏振效应。所考虑的成分是浮游植物、无机悬浮物（沉积物）和有色溶解有机物。由于双向反射率在海洋辐射过程中的重要作用，考虑了双向反射率对粗糙海面（由海面以上10 m的风速表示）和气溶胶的敏感性。结果表明，海面下的辐射亮度和偏振辐射亮度对各组分浓度的变化都很敏感，而偏振辐射亮度对观测几何的依赖性比辐射亮度更敏感。在镜面之间存在显着差异的浮游植物和沉积物的影响，在670 nm的海洋表面上的偏振度。在大气层顶部（TOA），偏振对波长较长的海洋粒子浓度变化相对不敏感。此外，在太阳平面上的TOA处的辐射比风速更敏感的气溶胶光学厚度。相反，风速强烈影响的辐射在TOA在太阳闪烁区，而偏振度表现出较少的依赖性在该地区。最后，提出了一种利用辐射测量同时反演气溶胶和风速的非线性最优反演方法。
Based on a vector radiative transfer model of the atmosphere-ocean system, the influence of oceanic components on radiation processes, including polarization effects, was investigated in the wavelength region ranging from 0.380 to 0.865 μm. The components considered were phytoplankton, inorganic suspended material (sediment), and colored, dissolved organic matter. Due to their important roles in oceanic radiation processes, the sensitivity of the bidirectional reflectance to the rough ocean surface, represented by the wind velocity 10 m above the ocean surface, and aerosol, were taken into account. The results demonstrated that both radiance and polarized radiance just below the ocean surface were sensitive to the change of the concentrations of the considered components, while the dependence of polarized radiance on the observation geometry was more sensitive than radiance. Significant differences in the specular plane existed between the impacts of the phytoplankton and sediment on the degree of polarization just above the ocean surface at 670 nm. At the top of the atmosphere (TOA), polarization was relatively insensitive to changing concentrations of ocean particles at longer wavelengths. Furthermore, the radiance at the TOA in the solar plane was more sensitive to the aerosol optical thickness than wind velocity. In contrast, wind velocity strongly influenced the radiance at the TOA in the sun glint region, while the polarization degree showed less dependence in that region. Finally, a nonlinear optimal inversion method was proposed to simultaneously retrieve the aerosol and wind velocity using radiance measurement.