GF5B

LSE, Atmospheric transmittance, upward and downward atmospheric radiation for GF-5B

The Thermodynamic Initial Guess Retrieval (TIGR) data set, in its latest version, is a climatological library of 2311 representative atmospheric situations selected by statistical methods from 80,000 radiosonde reports (Chédin et al., 1985; Achard, 1991; Chevallier et al., 1998). Each situation is described, from the surface to the top of the atmosphere, by the values of the temperature, water vapour and ozone concentrations on a given pressure grid.

Several datasets are associated with the above mentioned atmospheric profiles :

• The radiances (or equivalently the brightness temperatures) a satellite borne instrument (e.g. TOVS, ATOVS, AIRS, IASI, Modis, Seviri, IIR, etc..) would have observed under several conditions of observation (satellite zenith angle, surface characteristics, etc...).
• The transmittances and Jacobians (partial derivatives of the brightness temperature with respect to temperature, gas concentration for H2O, O3, CO2, N2O CO, CH4, etc., surface temperature and emissivity).