Interactive comment on “Validation of the Sentinel-5 Precursor TROPOMI cloud data with Cloudnet, Aura OMI O 2 -O 2 , MODIS and Suomi-NPP VIIRS”

This paper analyzes properties of clouds derived from TROPOMI measurements and conducts a validation exercise comparing them to retrieval inferred with sensors and algorithms based on different physical approaches. The objectives, methods used and the results must be considered as provisional, as the described algorithms seem not yet mature enough, as often declared by the authors themselves throughout the presentation of the results. Many improvements are undergoing and newer reprocessing of the records are to be expected in the near future. As such, the paper documents the ongoing effort to make TROPOMI cloud data reliable.