[ACG36-P01] Early results of GCOM-C "Shikisai" polarization observation and its calibration plan
Keywords:GCOM-C, SGLI, Polarization
SGLI (Second generation GLobal Imager), which is equipped on GCOM-C is a multi-band optical imaging radiometer with 19 spectral channels that can measure light intensity from near ultraviolet to thermal infrared (380nm to 12um) radiation reflected or emitted on the earth. SGLI consists of two radiometer components: VNR (Visible and Near Infrared Radiometer) and IRS (InfraRed Scanning radiometer).The optical unit is comprised of a non-polarized light (NP) observation sensor with 11 channels from 380nm to 868.5nm that scans areas in the nadir direction, and a polarized light (PL) observation sensor with 2 channels of 673.5nm and 868.5nm that can provide multi-angle observations by switching to directional angles ranging from +45 to -45 degree.
The PL unit can be observed at a resolution of 1km with a swath width of approximately 1150km. Polarization observations, measured at 0, 60 and 120 degree for polarization angles, are calculated using the Stokes parameters: I, Q and U. It is especially expected to enable to retrieve land aerosol using polarization and ultraviolet (380nm) band with higher accuracy because the advantage of using these bands is mainly their little dependency on the surface reflectance. We will introduce the method of the SGLI polarization observation and the calibration plan of the polarization sensitivity for NP and PL sensor.