Daily IASI/Metop-B ULB-LATMOS carbon monoxide (CO) L2 product (vertical profile and total column – EUMETSAT processing)

The daily IASI/Metop-B carbon monoxide (CO) dataset is processed by EUMETSAT Application Ground Segment using the Fast Optimal Retrievals on Layers for IASI (FORLI) software (Hurtmans et al., 2012) in the AC SAF framework.The IASI CO retrievals are performed in the 2143-2181.25 cm-1 spectral range using the optimal estimation method and tabulated absorption cross sections at various pressures and temperatures to speed up the radiative transfer calculation. A single a priori is used in the retrieval scheme. The temperature, pressure, humidity profiles and cloud fractions used in FORLI are those from the EUMETSAT Level 2 processor. Only pixels associated with cloud fraction below 25 % are processed. The IASI CO product is a vertical profile given as partial columns in moles per square meter in 18 layers between the surface and 18 km, with an extra layer from 18 km to the top of the atmosphere. The pressure levels associated with retrieval layers are provided with the CO product. This IASI CO dataset also includes other relevant information such as a general quality flag, the a priori profile, the total error profile, the air partial column profile, and the averaging kernel (AK) matrix, on the same vertical grid, and the total column and the total error associated.