Copernicus Sentinel-5 Precursor (S5p) products improvement

14 July 2022

As previously announced the update of the Copernicus Sentinel-5 Precursor (S5p) operational ground-processing system is now planned on 20th July 2022. This includes changes in the algorithms and product format for all products. The main impact on the data products of the processors upgrade is:

  • L1b Radiance degradation correction (the Irradiance degradation correction was already in place).

  • Usage of a Directional surface Lambertian Equivalent Reflectivity (DLER) database based on TROPOMI data, replacing OMI LER (for NO2 and O3 Profile) and GOME LER (for ALH).

  • CO product:

    • The unit of the column_averaging_kernel has changed from metres to unitless.

    • Inclusion of a priori profiles in the output product.

  • AAI product: a new wavelength pair using 335 and 367 nm to perform an aerosol index calculation has been added.

  • CH4 product: update order of fit for the spectral albedo dependence, for removing some artefacts in the CH4 products

  • Updates of the correction factors to account for the radiance degradation correction of the updated L1b, mainly affecting CLOUD and Ozone Near Real Time (NRT).

  • Updated the CLOUD neural networks for clear-sky and cloudy

The resulting production will be marked with Collection number 3 according to the file name convention (characters 58,59 of the filename).

Following the update, the quality of SO2 and HCHO production may be of temporarily reduced quality for 2 to 3 days whilst the background calibration is re-established, therefore these data should be used with care.

More details on the algorithm updates and format changes are available to the user community, together with sample data.

Full detailed information will be provided within the Product Readme Files after the operational switch.

Please note that NRT products for data acquired during the downtime period will be not generated. After the successful deployment of the new system, version numbers of the first orbit generated with the new version of the S5p operational processors both, in NRT and OFFL, will be provided.

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