Noise-free sensitivity test for lidar volume depolarization ratio and sun-photometer DoLP in GRASP code for a case study

The GRASP algorithm is used for the first time to retrieve aerosol properties using the synergy of a 7-wavelength sun-photometer measuring the Degree of Linear Polarization and a 3-wavelength elastic lidar measuring the volume depolarization ratio at 2 wavelengths. A sensitivity test of noise-free inversions is performed for a case study dominated by local, urban, and dust particles. The addition of the volume depolarization ratio in the synergy has a good fitting, mainly, for optical properties and affects the vertical shape of the aerosol profiles in comparison with inversions without it. The combination of linear depolarization and volume depolarization seems to have an incompatibility for inverting aerosol properties.