The TROPOMI/S5P cloud properties retrieval is based on the OCRA and ROCINN algorithms currently being used in the operational GOME and GOME-2 products. OCRA retrieves the cloud fraction using measurements in the UV/VIS spectral regions and ROCINN retrieves the cloud height (pressure) and optical thickness (albedo) using measurements in and around the oxygen A-band at 760 nm. For TROPOMI/S5P we use OCRA/ROCINN Version 3.0, which is based on a more realistic treatment of clouds as optically uniform layers of light-scattering particles. Additionally the cloud parameters are also provided for a cloud model which assumes the cloud to be a Lambertian reflecting boundary. The figures below illustrate the Cloud Fraction (top panel) and the Cloud Top Pressure (lower panel) as derived from TROPOMI data from 2 January 2018.
|Version number||Version Effective Orbit Number and Date||Summary of Changes|
|2.04.01||OFFL: orbit 24655, 2022-07-17
NRTI: orbit 24697, 2022-07-20
|Current version; New L1b|
|OFFL: orbit 22768, 2022-03-06
NRTI: orbit 22813, 2022-03-09
|OFFL: orbit 19258, 2021-07-01
NRTI: orbit 19308, 2021-07-05
|Extensive change set, updated L1b, see PRF|
USER DOCUMENTATION: ATBD, PUM, & README
Links to the Algorithm Theoretical Basis Document (ATBD), Product User Manual (PUM), and the Product Readme File (PRF) is provided here on the right under Documentation. Note: this data product was publically released on 11 July 2018 and is available via the Copernicus Open Data Access Hub (see link on right).