Wang M, Gordon H R
Appl Opt. 1993 Aug 20;32(24):4598-609. doi: 10.1364/AO.32.004598.
Based on the fact that the part of downward radiance that depends on the optical properties of the aerosol in the atmosphere can be extracted from the measured sky radiance, a new scheme for retrieval of the aerosol phase function and the single-scattering albedo over the ocean is developed. This retrieval algorithm is tested with simulations for several cases. It is found that the retrieved aerosol phase function and the single-scattering albedo are virtually error free if the vertical structure of the atmosphere is known and if the sky radiance and the aerosol optical thickness can be measured accurately. The robustness of the algorithm in realistic situations, in which the measurements are contaminated by calibration errors or noise, is examined. It is found that the retrieved value of ω(0) is usually in error by ≲ 10%, and the phase function is accurately retrieved for θ ≲ 90°. However, as the aerosol optical thickness becomes small, e.g., ≲ 0.1, errors in the sky radiance measurement can lead to serious problems with the retrieval algorithm, especially in the blue. The use of the retrieval scheme should be limited to the red and near IR when the aerosol optical thickness is small.
基于可以从实测天空辐射中提取出取决于大气中气溶胶光学特性的下行辐射部分这一事实，开发了一种用于反演海洋上空气溶胶相函数和单次散射反照率的新方案。该反演算法针对几种情况进行了模拟测试。结果发现，如果已知大气的垂直结构，并且能够准确测量天空辐射和气溶胶光学厚度，那么反演得到的气溶胶相函数和单次散射反照率几乎没有误差。研究了该算法在实际情况下的稳健性，在这些实际情况中，测量值受到校准误差或噪声的影响。结果发现，反演得到的ω(0)值通常误差≲10%，并且对于θ≲90°能准确反演相函数。然而，当气溶胶光学厚度变小时，例如≲0.1，天空辐射测量中的误差会给反演算法带来严重问题，尤其是在蓝光波段。当气溶胶光学厚度较小时，反演方案的使用应限于红光和近红外波段。
