Opt Express. 2023 May 8;31(10):15917-15939. doi: 10.1364/OE.489680.
Atmospheric correction (AC) of polarized radiances acquired by polarization satellite sensors, remains a challenge due to the complex radiative transfer processes of the coupled ocean-atmosphere system. In this study, we proposed an innovative polarized AC algorithm built on the near-infrared band (PACNIR) with an emphasis on the retrieval of the linear polarization components of the water-leaving radiance in clear open oceans. This algorithm was based on the black ocean assumption in the near-infrared band and fitted polarized radiance measurements along multiple observation directions with nonlinear optimized processing. Our retrieval algorithm notably inverted the linearly polarized components of the water-leaving radiance and aerosol parameters. Compared with that of the simulated linear polarization components of the water-leaving radiance via the vector radiative transfer model for the studied sea regions, the mean absolute error of the PACNIR-retrieved linearly polarized components (nQw and nUw) exhibited a magnitude of 10, while the magnitude of that of the simulated nQw and nUw data was 10. Moreover, the PACNIR-retrieved aerosol optical thicknesses at 865 nm exhibited a mean absolute percentage error of approximately 30% relative to in situ values obtained from Aerosol Robotic Network-Ocean Color (AERONET-OC) sites. The PACNIR algorithm could facilitate AC of the polarized data provided by the next generation of multiangle polarization satellite ocean color sensors.
由于耦合的海洋-大气系统的复杂辐射传输过程，偏振卫星传感器获取的偏振辐亮度的大气校正（AC）仍然是一个挑战。在本研究中，我们提出了一种基于近红外波段的创新偏振 AC 算法（PACNIR），重点是在清澈开阔的海洋中检索水离辐射的线性偏振分量。该算法基于近红外波段的黑海洋假设，并通过非线性优化处理拟合沿多个观测方向的偏振辐亮度测量值。我们的检索算法显著地反演了水离辐射和气溶胶参数的线性偏振分量。与通过针对研究海域的矢量辐射传输模型模拟的水离辐射的模拟线性偏振分量相比，PACNIR 检索的线性偏振分量（nQw 和 nUw）的平均绝对误差（MAE）为 10，而模拟的 nQw 和 nUw 数据的 MAE 为 10。此外，PACNIR 检索的 865nm 气溶胶光学厚度与从气溶胶机器人网络-海洋颜色（AERONET-OC）站点获得的现场值相比，平均绝对百分比误差约为 30%。PACNIR 算法可以促进下一代多角度偏振卫星海洋颜色传感器提供的偏振数据的 AC。
