The detailed evaluation is to be found in Callewaert et al., 2019. Here we only show the major results, with very limited discussion or interpretation.
Aerosol Optical Depth evaluation with AERONET
Figure 1: Map of the 72 AERONET stations that were matched with IASI measurements. The color scale represents the value of the Pearson correlation coefficient between the AERONET SDA coarse mode AOD and the MAPIR AOD converted to 550 nm.
Mean altitude evaluation with CALIOP
The mean altitude computed from the MAPIR vertical profiles (as the altitude for which half the aerosols are below and half are above) was compared with the mean altitude from CALIOP (altitude for which half the aerosol extinction is below and half is above) for 40 days in the year 2017. MAPIR on average underestimates the dust aerosol altitude by about 300m. Provided that the vertical sampling of the retrieval is 1km, this is a very good result.
Profile evaluation against CATS
Callewaert, S., Vandenbussche, S., Kumps, N., Kylling, A., Shang, X., Komppula, M., Goloub, P., and De Mazière, M.: The Mineral Aerosol Profiling from Infrared Radiances (MAPIR) algorithm: version 4.1 description and evaluation, Atmos. Meas. Tech., https://doi.org/10.5194/amt-12-3673-2019, 2019.