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).
|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|
USER DOCUMENTATION: ATBD, PUM & SAMPLE DATA
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.