Validation of tropospheric NO₂ column measurements of GOME-2A and OMI using MAX-DOAS and direct sun network observations

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dc.contributor.authorPinardi, Gaia
dc.contributor.authorVan Roozendael, Michel
dc.contributor.authorHendrick, François
dc.contributor.authorTheys, Nicolas
dc.contributor.authorAbuhassan, Nader
dc.contributor.authorHerman, Jay
dc.contributor.authoret al
dc.date.accessioned2022-02-28T14:33:37Z
dc.date.available2022-02-28T14:33:37Z
dc.date.issued2020-11-18
dc.descriptionAuthors:Gaia Pinardi, Michel Van Roozendael, François Hendrick, Nicolas Theys, Nader Abuhassan,, Alkiviadis Bais, Folkert Boersma,, Alexander Cede,, Jihyo Chong, Sebastian Donner, Theano Drosoglou, Anatoly Dzhola, Henk Eskes, Udo Frieß, José Granville, Jay R. Herman,, Robert Holla, Jari Hovila, Hitoshi Irie, Yugo Kanaya, Dimitris Karagkiozidis, Natalia Kouremeti,, Jean-Christopher Lambert, Jianzhong Ma, Enno Peters, Ankie Piters, Oleg Postylyakov, Andreas Richter, Julia Remmers, Hisahiro Takashima,, Martin Tiefengraber,, Pieter Valks, Tim Vlemmix, Thomas Wagner, and Folkard Wittrocken_US
dc.description.abstractMulti-axis differential optical absorption spectroscopy (MAX-DOAS) and direct sun NO₂ vertical column network data are used to investigate the accuracy of tropospheric NO₂ column measurements of the GOME-2 instrument on the MetOp-A satellite platform and the OMI instrument on Aura. The study is based on 23 MAX-DOAS and 16 direct sun instruments at stations distributed worldwide. A method to quantify and correct for horizontal dilution effects in heterogeneous NO₂ field conditions is proposed. After systematic application of this correction to urban sites, satellite measurements are found to present smaller biases compared to ground-based reference data in almost all cases. We investigate the seasonal dependence of the validation results as well as the impact of using different approaches to select satellite ground pixels in coincidence with ground-based data. In optimal comparison conditions (satellite pixels containing the station) the median bias between satellite tropospheric NO₂ column measurements and the ensemble of MAX-DOAS and direct sun measurements is found to be significant and equal to −34 % for GOME-2A and −24 % for OMI. These biases are further reduced to −24 % and −18 % respectively, after application of the dilution correction. Comparisons with the QA4ECV satellite product for both GOME-2A and OMI are also performed, showing less scatter but also a slightly larger median tropospheric NO₂ column bias with respect to the ensemble of MAX-DOAS and direct sun measurements.en_US
dc.description.sponsorshipEUMETSAT and the AC SAF are acknowledged for the production of GOME-2A GDP 4.8 data. KNMI is acknowledged for the production of OMI DOMINO v2.0 data, freely available from http://www.temis.nl (last access: 29 October 2020). QA4ECV data were obtained as part of the EC FP7 project Quality Assurance for Essential Climate Variables (QA4ECV; FP-SPACE-2013-1 project no. 607405). The Pandora data used in this work were obtained partly through the Pandonia Global Network (PGN) and are available publicly. This work has been supported by EUMETSAT through the AC SAF Continuous Development and Operations Phase (CDOP-3) and by the Belgian Federal Science Policy Office (BELSPO) via the ProDEx B-ACSAF contribution to the AC-SAF. Work done by Hitoshi Irie was supported by the Environment Research and Technology Development Fund (fund no. 2-1901) of the Environmental Restoration and Conservation Agency of Japan, JSPS KAKENHI (grant nos. JP19H04235 and JP17K00529), JAXA 2nd Research Announcement on the Earth Observations (grant no. 19RT000351).en_US
dc.description.urihttps://amt.copernicus.org/articles/13/6141/2020/amt-13-6141-2020.htmlen_US
dc.format.extent34 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2rrjm-zevm
dc.identifier.citationPinardi, G., Van Roozendael, M., Hendrick, F., Theys, N., Abuhassan, N., Bais, A., Boersma, F., Cede, A., Chong, J., Donner, S., Drosoglou, T., Dzhola, A., Eskes, H., Frieß, U., Granville, J., Herman, J. R., Holla, R., Hovila, J., Irie, H., Kanaya, Y., Karagkiozidis, D., Kouremeti, N., Lambert, J.-C., Ma, J., Peters, E., Piters, A., Postylyakov, O., Richter, A., Remmers, J., Takashima, H., Tiefengraber, M., Valks, P., Vlemmix, T., Wagner, T., and Wittrock, F.: Validation of tropospheric NO2 column measurements of GOME-2A and OMI using MAX-DOAS and direct sun network observations, Atmos. Meas. Tech., 13, 6141–6174, https://doi.org/10.5194/amt-13-6141-2020, 2020.en_US
dc.identifier.urihttps://doi.org/10.5194/amt-13-6141-2020
dc.identifier.urihttp://hdl.handle.net/11603/24329
dc.language.isoen_USen_US
dc.publisherEGUen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.en_US
dc.rightsAttribution 4.0 International (CC BY 4.0)*
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/*
dc.titleValidation of tropospheric NO₂ column measurements of GOME-2A and OMI using MAX-DOAS and direct sun network observationsen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-9146-1632en_US

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