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Atmos. Meas. Tech., 11, 2395-2426, 2018
https://doi.org/10.5194/amt-11-2395-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
26 Apr 2018
Algorithm theoretical baseline for formaldehyde retrievals from S5P TROPOMI and from the QA4ECV project
Isabelle De Smedt1, Nicolas Theys1, Huan Yu1, Thomas Danckaert1, Christophe Lerot1, Steven Compernolle1, Michel Van Roozendael1, Andreas Richter2, Andreas Hilboll2, Enno Peters2, Mattia Pedergnana3, Diego Loyola3, Steffen Beirle4, Thomas Wagner4, Henk Eskes5, Jos van Geffen5, Klaas Folkert Boersma5,6, and Pepijn Veefkind5 1Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
2Institute of Environmental Physics, University of Bremen (IUP-UB), Otto-Hahn-Allee 1, 28359 Bremen, Germany
3Institut für Methodik der Fernerkundung (IMF), Deutsches Zentrum für Luft und Raumfahrt (DLR), Oberpfaffenhofen, Germany
4Max Planck Institute for Chemistry (MPIC), Hahn-Meitner-Weg 1, 55128 Mainz, Germany
5KNMI, De Bilt, the Netherlands
6Wageningen University, Meteorology and Air Quality Group, Wageningen, the Netherlands
Abstract. On board the Copernicus Sentinel-5 Precursor (S5P) platform, the TROPOspheric Monitoring Instrument (TROPOMI) is a double-channel, nadir-viewing grating spectrometer measuring solar back-scattered earthshine radiances in the ultraviolet, visible, near-infrared, and shortwave infrared with global daily coverage. In the ultraviolet range, its spectral resolution and radiometric performance are equivalent to those of its predecessor OMI, but its horizontal resolution at true nadir is improved by an order of magnitude. This paper introduces the formaldehyde (HCHO) tropospheric vertical column retrieval algorithm implemented in the S5P operational processor and comprehensively describes its various retrieval steps. Furthermore, algorithmic improvements developed in the framework of the EU FP7-project QA4ECV are described for future updates of the processor. Detailed error estimates are discussed in the light of Copernicus user requirements and needs for validation are highlighted. Finally, verification results based on the application of the algorithm to OMI measurements are presented, demonstrating the performances expected for TROPOMI.
Citation: De Smedt, I., Theys, N., Yu, H., Danckaert, T., Lerot, C., Compernolle, S., Van Roozendael, M., Richter, A., Hilboll, A., Peters, E., Pedergnana, M., Loyola, D., Beirle, S., Wagner, T., Eskes, H., van Geffen, J., Boersma, K. F., and Veefkind, P.: Algorithm theoretical baseline for formaldehyde retrievals from S5P TROPOMI and from the QA4ECV project, Atmos. Meas. Tech., 11, 2395-2426, https://doi.org/10.5194/amt-11-2395-2018, 2018.
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Short summary
This paper introduces the formaldehyde (HCHO) tropospheric vertical column retrieval algorithm implemented in the TROPOMI/Sentinel-5 Precursor operational processor, and comprehensively describes its various retrieval steps. Furthermore, algorithmic improvements developed in the framework of the EU FP7-project QA4ECV are described for future updates of the processor. Detailed error estimates are discussed in the light of Copernicus user requirements and needs for validation are highlighted.
This paper introduces the formaldehyde (HCHO) tropospheric vertical column retrieval algorithm...
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