Articles | Volume 11, issue 4
https://doi.org/10.5194/amt-11-2395-2018
https://doi.org/10.5194/amt-11-2395-2018
Research article
 | 
26 Apr 2018
Research article |  | 26 Apr 2018

Algorithm theoretical baseline for formaldehyde retrievals from S5P TROPOMI and from the QA4ECV project

Isabelle De Smedt, Nicolas Theys, Huan Yu, Thomas Danckaert, Christophe Lerot, Steven Compernolle, Michel Van Roozendael, Andreas Richter, Andreas Hilboll, Enno Peters, Mattia Pedergnana, Diego Loyola, Steffen Beirle, Thomas Wagner, Henk Eskes, Jos van Geffen, Klaas Folkert Boersma, and Pepijn Veefkind

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Cited articles

Abbot, D. S., Palmer, P. I., Martin, R. V., Chance, K. V., Jacob, D. J., and Guenther, A.: Seasonal and interannual variability of North American isoprene emissions as determined by formaldehyde column measurements from space, Geophys. Res. Lett., 30, 1886, https://doi.org/10.1029/2003GL017336, 2003. 
Barkley, M. P., Palmer, P. I., Ganzeveld, L. N., Arneth, A., Hagberg, D., Karl, T., Guenther, A. B., Paulot, F., Wennberg, P. O., Mao, J., Kurosu, T. P., Chance, K. V, Müller, J.-F., De Smedt, I., Van Roozendael, M., Chen, D., Wang, Y., and Yantosca, R. M.: Can a state of the art chemistry transport model simulate Amazonian tropospheric chemistry?, J. Geophys. Res., 116, D16302, https://doi.org/10.1029/2011JD015893, 2011. 
Barkley, M. P., Kurosu, T. P., Chance, K., Smedt, I. De, Van Roozendael, M., Arneth, A., Hagberg, D., Guenther, A., and De Smedt, I.: Assessing sources of uncertainty in formaldehyde air mass factors over tropical South America: Implications for top-down isoprene emission estimates, J. Geophys. Res., 117, D13304, https://doi.org/10.1029/2011JD016827, 2012. 
Barkley, M. P., De Smedt, I., Van Roozendael, M., Kurosu, T. P., Chance, K. V, Arneth, A., Hagberg, D., Guenther, A. B., Paulot, F., Marais, E. A., and Mao, J.: Top-down isoprene emissions over tropical South America inferred from SCIAMACHY and OMI formaldehyde columns, J. Geophys. Res.-Atmos., 118, https://doi.org/10.1002/jgrd.50552, 2013. 
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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.
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