Accurate models of polarized surface reflectance are essential for atmospheric aerosol retrieval from remote sensing polarimeters such as the Aerosol Polarimetry Sensor (APS) on the upcoming NASA Glory mission. However, most existing models are ad hoc modifications of the Fresnel reflection coefficient. These modifications require scale factors that are large and unrelated to the ad hoc justification for the use of the Fresnel coefficient. In addition, measurements from recent field campaigns show polarized reflectance in the backscatter that cannot be reproduced by polarized surface reflectance models that use the Fresnel coefficient. Here we present a physically based polarized surface model. We use geometric optics models of large plates and needles to describe leaves and spheroidal particles for grains of soil. These are compared to the measured polarization of various surfaces and the efficacy of these physical models are evaluated.
AGU Fall Meeting Abstracts
- Pub Date:
- December 2007
- 0305 Aerosols and particles (0345;
- 0360 Radiation: transmission and scattering;
- 0669 Scattering and diffraction