The Normalized Difference Vegetation Index and Angular Variation of Surface Spectral Polarized Reflectance Relationships: Improvements on Aerosol Remote Sensing Over Land

摘要

Surface polarized reflectance is related to its optical properties and observation geometry. It disturbs remote sensing of aerosol. In this study, we differentiated the polarized reflectance of a natural surface based on the normalized difference vegetation index and scattering angle, and the interband correlation coefficients were generally higher than that without differentiation. The spectral relationship was determined based on normalized difference vegetation index and scattering angle and then employed for aerosol retrieval from polarization and anisotropy of reflectances for atmospheric sciences coupled with observations from a lidar measurements. The retrieved aerosol optical depths (AODs) were contrasted with Aerosol Robotic Network results. The correlation coefficient between the retrieved and Aerosol Robotic Network AODs increased from 0.723 to 0.836, and the root‐mean‐square error reduced from 0.348 to 0.245 after considering the differentiated relationship. Thus, the accuracy of the retrieved AOD values was improved. Plain Language Summary The spectral relationship of surface polarized reflectance is related to the properties of land cover and observation geometry. Yet on many occasions of aerosol remote sensing, it is not sufficiently considered. In this study, we differentiated the polarized reflectance of a natural surface based on its properties and observation angles and the new spectral relationship was obtained using satellite measurements of 3?years. This relationship was applied to aerosol remote sensing and it provided more accurate results. It was demonstrated that surface property and observation angle values differentially contribute the surface polarized reflectance and considering the difference benefits the estimate of aerosol from satellite measurements.