[A-CG41] 衛星による地球環境観測

[ACG41-07] Uncertainty of GEMS AEH products caused by AOD and surface reflectance

*PARK SANG SEO¹ (1.Ulsan National Institute of Science and Technology)

キーワード：GEMS、aerosol、aerosol effective height

The oxygen-related absorption bands, such as oxygen dimer (O2-O2), can be used to retrieve the aerosol and cloud scattering information by identifying the optical path length change. In addition, the oxygen absorption bands are also applied to the vertical information of scattering materials. The Geostationary Environment Monitoring Spectometer (GEMS) retrieves the aerosol layer height information (aerosol layer height; ALH or aerosol effective height; AEH) after retrieving the aerosol optical properties. Because the GEMS have spectral range of 300-500 nm with spectral resolution of 0.6 nm, the O2-O2 absorption band at 477 nm has been solely used to retrieve the aerosol height information. After launching the GEMS, the scientific products have been stably retrieved.
The aerosol effective height (AEH) product from GEMS uses the GEMS aerosol and surface products as input parameters. However, these retrieval results include the uncertainty, thus, the AEH is also affected by the uncertainty of input parameters.
In this study, we identified the uncertainty of AEH retrieval results based on the empirical results from GEMS observation. During the retrieval, we also estimated the sensitivity of AEH retrieval for the aerosol optical depth (AOD) and surface reflectance.