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© 2021. This work is published under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

This paper reports on consolidated ground-based validation results of the atmospheric NO2 data produced operationally since April 2018 by the TROPOspheric Monitoring Instrument (TROPOMI) on board of the ESA/EU Copernicus Sentinel-5 Precursor (S5P) satellite. Tropospheric, stratospheric, and total NO2 column data from S5P are compared to correlative measurements collected from, respectively, 19 Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS), 26 Network for the Detection of Atmospheric Composition Change (NDACC) Zenith-Scattered-Light DOAS (ZSL-DOAS), and 25 Pandonia Global Network (PGN)/Pandora instruments distributed globally. The validation methodology gives special care to minimizing mismatch errors due to imperfect spatio-temporal co-location of the satellite and correlative data, e.g. by using tailored observation operators to account for differences in smoothing and in sampling of atmospheric structures and variability and photochemical modelling to reduce diurnal cycle effects. Compared to the ground-based measurements, S5P data show, on average, (i) a negative bias for the tropospheric column data, of typically -23 % to -37 % in clean to slightly polluted conditions but reaching values as high as -51 % over highly polluted areas; (ii) a slight negative median difference for the stratospheric column data, of about -0.2 Pmolec cm-2, i.e. approx. -2 % in summer to -15 % in winter; and (iii) a bias ranging from zero to -50 % for the total column data, found to depend on the amplitude of the total NO2 column, with small to slightly positive bias values for columns below 6 Pmolec cm-2 and negative values above. The dispersion between S5P and correlative measurements contains mostly random components, which remain within mission requirements for the stratospheric column data (0.5 Pmolec cm-2) but exceed those for the tropospheric column data (0.7 Pmolec cm-2). While a part of the biases and dispersion may be due to representativeness differences such as different area averaging and measurement times, it is known that errors in the S5P tropospheric columns exist due to shortcomings in the (horizontally coarse) a priori profile representation in the TM5-MP chemical transport model used in the S5P retrieval and, to a lesser extent, to the treatment of cloud effects and aerosols. Although considerable differences (up to 2 Pmolec cm-2 and more) are observed at single ground-pixel level, the near-real-time (NRTI) and offline (OFFL) versions of the S5P NO2 operational data processor provide similar NO2 column values and validation results when globally averaged, with the NRTI values being on average 0.79 % larger than the OFFL values.

Details

Title
Ground-based validation of the Copernicus Sentinel-5P TROPOMI NO2 measurements with the NDACC ZSL-DOAS, MAX-DOAS and Pandonia global networks
Author
Verhoelst, Tijl 1   VIAFID ORCID Logo  ; Compernolle, Steven 1   VIAFID ORCID Logo  ; Pinardi, Gaia 1   VIAFID ORCID Logo  ; Jean-Christopher, Lambert 1 ; Eskes, Henk J 2   VIAFID ORCID Logo  ; Eichmann, Kai-Uwe 3 ; Ann Mari Fjæraa 4 ; Granville, José 1 ; Niemeijer, Sander 5 ; Cede, Alexander 6 ; Tiefengraber, Martin 7 ; Hendrick, François 1 ; Pazmiño, Andrea 8 ; Bais, Alkiviadis 9   VIAFID ORCID Logo  ; Bazureau, Ariane 8 ; K Folkert Boersma 10   VIAFID ORCID Logo  ; Bognar, Kristof 11 ; Dehn, Angelika 12 ; Donner, Sebastian 13   VIAFID ORCID Logo  ; Elokhov, Aleksandr 14   VIAFID ORCID Logo  ; Gebetsberger, Manuel 7 ; Goutail, Florence 8 ; Michel Grutter de la Mora 15   VIAFID ORCID Logo  ; Gruzdev, Aleksandr 14   VIAFID ORCID Logo  ; Gratsea, Myrto 16 ; Hansen, Georg H 17 ; Irie, Hitoshi 18 ; Jepsen, Nis 19 ; Kanaya, Yugo 20 ; Karagkiozidis, Dimitris 9 ; Kivi, Rigel 21   VIAFID ORCID Logo  ; Kreher, Karin 22 ; Levelt, Pieternel F 23 ; Liu, Cheng 24   VIAFID ORCID Logo  ; Müller, Moritz 7   VIAFID ORCID Logo  ; Monica Navarro Comas 25 ; Piters, Ankie J M 2 ; Pommereau, Jean-Pierre 8   VIAFID ORCID Logo  ; Portafaix, Thierry 26 ; Prados-Roman, Cristina 25   VIAFID ORCID Logo  ; Puentedura, Olga 25   VIAFID ORCID Logo  ; Querel, Richard 27   VIAFID ORCID Logo  ; Remmers, Julia 13 ; Richter, Andreas 3   VIAFID ORCID Logo  ; Rimmer, John 28 ; Claudia Rivera Cárdenas 15   VIAFID ORCID Logo  ; Lidia Saavedra de Miguel 12 ; Sinyakov, Valery P 29 ; Stremme, Wolfgang 15   VIAFID ORCID Logo  ; Strong, Kimberly 11   VIAFID ORCID Logo  ; Michel Van Roozendael 1 ; Veefkind, J Pepijn 2 ; Wagner, Thomas 11 ; Wittrock, Folkard 3 ; Margarita Yela González 22 ; Zehner, Claus 30 

 Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Ringlaan 3, 1180 Uccle, Belgium 
 Royal Netherlands Meteorological Institute (KNMI), Utrechtseweg 297, 3730 AE De Bilt, the Netherlands 
 Institute of Environmental Physics (IUP), University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany 
 Norsk Institutt for Luftforskning (NILU), Instituttveien 18, 2007 Kjeller, Norway 
 Science & Technology Corporation (S&T), Delft, the Netherlands 
 Goddard Space Flight Center (NASA/GSFC), Greenbelt, MD, USA; LuftBlick, Kreith, Austria; Institute of Meteorology and Geophysics, University of Innsbruck, Innsbruck, Austria 
 LuftBlick, Kreith, Austria; Institute of Meteorology and Geophysics, University of Innsbruck, Innsbruck, Austria 
 Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), UVSQ Université Paris-Saclay/Sorbonne Université/CNRS, Guyancourt, France 
 Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki (AUTH), Thessaloniki, Greece 
10  Royal Netherlands Meteorological Institute (KNMI), Utrechtseweg 297, 3730 AE De Bilt, the Netherlands; Meteorology and Air Quality group, Wageningen University, 6700 AA Wageningen, the Netherlands 
11  Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, M5S 1A7, Canada 
12  European Space Agency/Centre for Earth Observation (ESA/ESRIN), Frascati, Italy 
13  Max-Planck-Institut für Chemie (MPI-C), Hahn-Meitner-Weg 1, 55128 Mainz, Germany 
14  A.M. Obukhov Institute of Atmospheric Physics (IAP), Russian Academy of Sciences, Moscow, Russian Federation 
15  Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México (UNAM), Mexico City, Mexico 
16  National Observatory of Athens, Lofos Nymphon – Thissio, P.O. Box 20048 – 11810, Athens, Greece 
17  Norsk Institutt for Luftforskning (NILU), P.O. Box 6606 Langnes, 9296 Tromsø, Norway 
18  Center for Environmental Remote Sensing, Chiba University (Chiba U), Chiba, Japan 
19  Danish Meteorological Institute (DMI), Lyngbyvej 100, 2100 Copenhagen, Denmark 
20  Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan 
21  Space and Earth Observation Centre, Finnish Meteorological Institute, Tähteläntie 62, 99600 Sodankylä, Finland 
22  BK Scientific GmbH, Astheimerweg 42, 55130 Mainz, Germany 
23  Royal Netherlands Meteorological Institute (KNMI), Utrechtseweg 297, 3730 AE De Bilt, the Netherlands; University of Technology Delft, Mekelweg 5, 2628 CD Delft, the Netherlands 
24  Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, 230026, China 
25  Atmospheric Research and Instrumentation, National Institute for Aerospace Technology (INTA), Madrid, 28850, Spain 
26  Laboratoire de l'Atmosphère et des Cyclones (LACy), Université de La Réunion, Saint-Denis, France 
27  National Institute of Water and Atmospheric Research (NIWA), Private Bag 50061, Omakau, Central Otago, New Zealand 
28  University of Manchester, Oxford Rd, Manchester, M13 9PL, United Kingdom 
29  Kyrgyz National University of Jusup Balasagyn (KNU), 547 Frunze Str., Bishkek, Kyrgyz Republic 
30  Meteorology and Air Quality group, Wageningen University, 6700 AA Wageningen, the Netherlands 
Pages
481-510
Publication year
2021
Publication date
2021
Publisher
Copernicus GmbH
ISSN
18671381
e-ISSN
18678548
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2479620561
Copyright
© 2021. This work is published under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.