海洋水色及水温扫描仪精确瑞利散射计算

瑞利散射计算精度对海洋水色遥感大气校正的精度起着关键作用，为了提高瑞利散射的计算精度，需要求解平行分层大气矢量辐射传输方程。详细地推导了加倍法解大气矢量辐射传输方程的基本关系式，并阐述了利用加倍法解矢量辐射传输方程的原理。通过与海视宽视场遥感器(SeaWiFS)精确瑞利散射查找表计算结果的比较，证明利用加倍法计算瑞利散射的精度优于0．5％，完全能够满足海洋水色遥感大气校正对瑞利散射计算精度的要求，并可以用来生成海洋水色及水温扫描仪精确瑞利散射查找表。最后，利用开发的加倍法解矢量辐射传输方程软件包，生成了海洋水色及水温扫描仪的精确瑞利散射查找表。开发的加倍法解矢量辐射传输方程软件包可直接用于我国第二代高性能海洋水色遥感器精确瑞利散射查找表的生成。

Exact Rayleigh Scattering Calculation for Chinese Ocean Color and Temperature Scanner

The accuracy of Rayleigh scattering calculation affects the quality of atmospheric correction of the ocean color remote sensing significantly, and it is essential to solve the vector radiative transfer equation (VRTE) in plane parallel atmosphere to improve the accuracy of Rayleigh scattering calculation. This paper deduces the basic equations of VRTE with the adding doubling method in detail, and expounds the principle of the adding doubling method. By comparing with the exact Rayleigh scattering radiance derived from SeaWiFS (sea viewing wide field of view sensor) exact Rayleigh scattering look up table, it shows that the relative error of Rayleigh scattering calculation with the adding doubling method is less than 0.5%, which meets the required accuracy of the atmospheric correction of ocean color remote sensing. Therefore, the adding doubling method can be used to generate the Rayleigh scattering look up table for Chinese ocean color and temperature scanner (COCTS). Finally, using the developed vector radiative transfer code with adding doubling method, we had generated the exact Rayleigh scattering look up tables for COCTS. Also, the vector radiative transfer code developed can be used to generate the exact Rayleigh scattering look up table for Chinese second generation ocean color remote sensors which have high performances.