Rehm Eric, McCormick Norman J
University of Washington, Seattle, WA 98105-6698, USA.
Opt Express. 2011 Dec 5;19(25):24986-5005. doi: 10.1364/OE.19.024986.
We develop two algorithms for determining two inherent optical properties (IOPs) from radiometric measurements in vertically homogeneous waters. The first algorithm is for estimation of the ratio of the backscattering to absorption coefficients from measurements of only the vertically upward radiance and the downward planar irradiance at depths where the light field is in the asymptotic regime. The second algorithm enables estimation of the absorption coefficient from measurement of the diffuse attenuation coefficient in the asymptotic regime after use of the first algorithm. Multiplication of the two estimates leads to an estimate for the backscattering coefficient. The algorithms, based upon the use of a simplified phase function and the asymptotic eigenmode, are shown to potentially provide good starting conditions for iteratively determining the absorption and backscattering coefficients of a wide variety of waters. The uncertainty in the estimates defines a subspace for IOPs that may reduce ambiguity in such iterative solutions. Because of the ease of estimating the backscattering to absorption ratio from in-water measurements, this IOP deserves further investigation as a proxy for biogeochemical quantities in the open ocean.
我们开发了两种算法，用于从垂直均匀水体中的辐射测量确定两种固有光学特性（IOPs）。第一种算法用于仅根据光场处于渐近状态深度处的垂直向上辐亮度和向下平面辐照度测量值，估算后向散射系数与吸收系数的比值。第二种算法在使用第一种算法后，能够根据渐近状态下的漫衰减系数测量值估算吸收系数。将这两个估算值相乘可得到后向散射系数的估算值。基于简化相位函数和渐近本征模的这些算法，被证明有可能为迭代确定各种水体的吸收系数和后向散射系数提供良好的初始条件。估算中的不确定性定义了IOPs的一个子空间，这可能会减少此类迭代解中的模糊性。由于从水中测量估算后向散射与吸收比值很容易，这种IOP作为公海中生物地球化学量的替代指标值得进一步研究。
