The TROPOMI cloud retrieval for cloud fraction, albedo, and top pressure is based on the ROCINN algorithms currently being used in the operational GOME and GOME-2 products. These cloud retrieval algorithms use measurements in and around the O2 A-band at 760 nm and are based on the Independent Pixel Approximation (IPA), which is the assumption that the "radiative properties of a single satellite “Pixel” are considered in isolation from neighbouring pixels" (definition of the American Meteorological Society). For TROPOMI/S5p we will use ROCINN Version 3.0, which is based on a more realistic treatment of clouds as optically uniform layers of light-scattering particles (water droplets). 

Data product version summary (click version number for latest Product Readme).
Version number Version Effective Date Summary of Changes
2.0.0 6-June-2018 to present Cloud albedo error definition improved
1.0.0 20-Aug-2017 to 5-June-2018 First product release



The Algorithm Theoretical Basis Document (ATBD) can be found by clicking here. The Product User Manual (PUM) and Sample Data Files are being updated based on a new release of the processing software and will be available for download by mid-May 2017.

After launch, preliminary product results will be provided during the Commissioning Phase and the Operational Phase.