海水颗粒物体积散射函数对海洋遥感反射比双向反射特性影响机理和模型研究

Due to the complex natural variability of particle volume scattering functions in the ocean, and the complexity of the effect of volume scattering functions on the bidirectional reflectance distribution function (BRDF) characteristics of the remote sensing reflectance, we have not yet fully understood the bidirectional remote sensing reflectance, and this makes the research on parameterizing the bidirectional remote sensing reflectance relatively slow. The study of the bidirectional effect will strengthen our understanding of the light propagation in the ocean, and the parameterization of the bidirectional effect will directly affect the accuracy and quality of data products provided by ocean color remote sensing. Therefore, using in-situ measured volume scattering function and numerical simulation software, based on the theoretical derivation in Zaneveld [1982, 1995], firstly this project intends to study the mechanism of the effect of particle volume scattering functions on bidirectional remote sensing reflectance, and parameterization of the BRDF factor of remote sensing reflectance by explicitly accounting for particle scattering shapes; Secondly this project will research on the BRDF correction method using the bidirectional remote sensing reflectance model, and evaluate its performance using numerical simulation data and field measurements; Finally, this project will study the potential method to retrieve particle backscattering scattering shapes from remote sensing reflectance.

由于自然海水颗粒物体积散射函数变化的多样性，以及体积散射函数对海洋遥感反射比的双向反射（BRDF）特性的影响的复杂性，迄今我们对其影响规律仍尚未完全了解，这使得对其参数化模型的研究进展相对较慢，对其影响规律的研究将加强我们对光在海洋水体中的传播过程的理解，对其影响规律的参数化模型将直接影响海洋水色遥感提供的各级数据产品的精度和质量。本项目拟将利用现场测量的体积散射函数，通过数值模拟方法，在Zaneveld [1982, 1995]理论基础上，首先研究水体颗粒物体积散射函数对遥感反射比的影响机制，建立完善考虑水体颗粒物体积散射函数形状的遥感反射比的BRDF因子的参数化模型；然后研究利用该参数化模型对遥感反射比进行BRDF校正，并对其性能利用数值模拟和现场测量数据进行验证比较；最后将尝试研究利用该参数化模型从遥感反射比反演获得体积散射函数形状（至少是后向散射形状）的可能性。

自然海水颗粒物体积散射函数变化多样，对海洋遥感反射比双向反射（BRDF）特性影响复杂，迄今我们对其影响规律仍尚未完全了解。本项目在Zaneveld（1982, 1995）理论研究基础上进一步推导得到体积散射函数形状影响海洋遥感反射比BRDF性质因子解析表达式形式，然后利用现场测量体积散射函数数据，通过数值模拟数据建立遥感反射比BRDF因子参数化模型；然后研究利用该参数化模型对遥感反射比进行BRDF校正，给出了利用该参数化模型以及现有常用Morel等（2002）和Lee等（2011）BRDF校正方法对遥感反射比进行BRDF校正性能比较结果；并利用该参数化模型初步实现了对体积散射函数后向散射形状的遥感反演尝试。本研究加强了我们对遥感反射比BRDF特性影响规律的认识，可对获取高质量现场测量及海洋水色遥感数据产品提供重要参考，进一步发掘了遥感反演的潜力，对推动海洋水色遥感发展有重要意义。