In this study we estimate CLARREO RS radiometric errors due to polarization effects for both, benchmark and reference inter-calibration operating modes. The PARASOL Level-1 polarization and Level-2 Clouds data have been used in combiation with orbital simulation of sampling. For benchmark mode we used simulated annual sampling for 90 polar orbit, and for reference inter-calibration of CLARREO RS with instruments on NPOESS (VIIRS, CERES) simulated cross-track data collecting mode. Selected PARASOL data over year 2006 provided realistic global sampling of polarization levels in visible spectral range and scene types. For error estimate in near-infrared spectral range we used a radiative transfer model.
The results of this study lead to the formulation of requirement for sensitivity to polarizaion for CLARREO RS imaging spectrometer: sensitivity to polarization of the instrument should not exceed 0.25% (1 sigma) in visible (below 1000 nm wavelength), and 0.75% (1 sigma) in near-infrared spectral ranges (beyond 1000 nm wavelength).
![](images/flag.png)
![](images/blue_ribbon.png)