Study for Sun Glint Observation of GOSAT FTS using MODIS and AMSR-E Data

Greenhouse gases observation by space-borne FTS, such as GOSAT, is a challenging project. The FTS enables to obtain the high spectral resolution data, although the high SNR depends on the scanning speed during an interferometric scan time. The FTS measurement is based upon no-changeable target radiance, however it depends on the mechanical pointing accuracy and stability as well as the target natural stability during an interferometric scan time. The FTS onboard GOSAT satellite primarily aims at observing CO₂ over the land and oceanic sun glint in shortwave infrared. We study the sun glint radiance level and the stability during an interferometric scan time using Aqua satellite data, such as MODIS radiance and AMSR-E sea surface wind over the same oceanic sun glint region.