12:00 PM - 12:15 PM
[ACG10-24] Synergistic observations using a wide spectral-coverage FTS and an agile pointing mechanism onboard GOSAT
Keywords:GOSAT , TANSO-FTS, FTS, thermal infrared, polarization, vertical profile
The modification of the light path by the scattering induced by thin clouds and aerosol scatterings, which are highly polarized, is still the largest source of errors and information on their vertical location can minimize the errors in GHG retrievals. The measured light is a combination of surface reflection and scattering by clouds and aerosols, which have different phase functions. Polarization measurement of O2 A band spectra has potential height information The TANSO-FTS instrument has a ZnSe non-coated beam with an incident angle of 45deg and a large polarization sensitivity. The analysis using vector radiative transfer calculation and an instrument Muller matrix becomes complicated. The polarization of the spectra shows strong dependency on the geometry of the sun, the target object and the satellite. A unique function of TANSO-FTS is agile targeting; the two axes mechanism helps target and view a point source from different geometries by uploading the pointing angle and location tables on a daily basis.
In this study, a simpler but robust algorithm is proposed by minimizing the number of parameters to be retrieved, and optimizing sampling pattern and viewing geometry to minimize the highly geometry-dependent polarization related errors.