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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-147
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-147
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 26 Apr 2019

Submitted as: research article | 26 Apr 2019

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Measurement Techniques (AMT) and is expected to appear here in due course.

TROPOMI/S5ptotal ozone column data: global ground-based validation & consistency with other satellite missions

Katerina Garane1, Maria-Elissavet Koukouli1, Tijl Verhoelst2, Vitali Fioletov3, Christophe Lerot2, Klaus-Peter Heue4, Alkiviadis Bais1, Dimitrios Balis1, Ariane Bazureau5, Angelika Dehn6, Florence Goutail5, Jose Granville2, Debora Griffin3, Daan Hubert2, Arno Keppens2, Jean-Christopher Lambert2, Diego Loyola4, Chris McLinden3, Andrea Pazmino5, Jean-Pierre Pommereau5, Alberto Redondas7, Fabian Romahn4, Pieter Valks4, Michel Van Roozendael2, Jian Xu4, Claus Zehner6, Christos Zerefos8, and Walter Zimmer4 Katerina Garane et al.
  • 1Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Greece
  • 2Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Belgium
  • 3Environment Climate Change Canada
  • 4Deutsches Zentrum für Luft-und Raumfahrt (DLR), Institut für Methodik der Fernerkundung (IMF), Germany
  • 5LATMOS, CNRS, University Versailles St Quentin, France
  • 6European Space Agency, ESRIN, Frascati, Italy
  • 7Izaña Atmospheric Research Center (IARC), State Meteorological Agency (AEMET), Spain
  • 8Academy of Athens, Greece (AA)

Abstract. In October 2017, the Sentinel-5 Precursor (S5p) mission was launched, carrying the TROPOspheric Monitoring Instrument, TROPOMI, which provides a daily global coverage at a spatial resolution as high as 7 km × 3.5 km and is expected to extend the European atmospheric composition record initiated with GOME/ERS-2 in 1995, bringing up significant new components to the scientific knowledge of atmospheric processes. Due to the ongoing need to understand and monitor the recovery of the ozone layer, as well as the evolution of tropospheric pollution, total ozone remains one of the leading species of interest during this mission.

In this work the TROPOMI Near-Real Time, NRTI, and Offline, OFFL, total ozone column (TOC) products are presented and compared to daily ground-based quality-assured Brewer and Dobson TOC measurements deposited in the World Ozone and Ultraviolet Radiation Data Centre (WOUDC). Additional comparisons to individual Brewer measurements from the Canadian Brewer Network and the European Brewer Network (Eubrewnet) are performed. Furthermore, twilight zenith-sky measurements obtained with ZSL-DOAS (Zenith Scattered Light Differential Optical Absorption Spectroscopy) instruments, that form part of the SAOZ network (Système d'Analyse par Observation Zénitale), are used for the validation. The quality of the TROPOMI TOC data is evaluated in terms of the influence of location, solar zenith and viewing angles, season, effective temperature, surface albedo and clouds. For this purpose, globally distributed ground-based measurements have been utilized as the background truth. The overall statistical analysis of the global comparison shows that the mean bias and the mean standard deviation of the percentage difference between TROPOMI and ground-based TOC is within 0–1.5 % and 2.5–4.5 %, respectively. The mean bias that results from the comparisons is well within the S5p product requirements, while the mean standard deviation is very close to those limits, especially considering that the statistics shown here originate both from the satellite and the ground-based measurements.

Additionally, the TROPOMI OFFL and NRTI products are evaluated against already known space-borne sensors, namely, the Ozone Mapping Profiler Suite on board the Suomi National Polar-orbiting Partnership (OMPS/Suomi-NPP), NASA v2 TOCs, and the Global Ozone Monitoring Experiment–2 (GOME-2) on board the MetοpΑ (GOME-2/MetοpΑ) and MetopB (GOME-2/MetopB) satellites. This analysis shows a very good agreement for both TROPOMI products to well established instruments, with the absolute differences in mean bias and mean standard deviation being below 0.7 % and 1 %, respectively. These results assure the scientific community of the good quality of the TROPOMI TOC products during its first year of operation and enhance the already high expectations that S5p TROPOMI will play a very significant role in the continuity of the ozone monitoring from space.

Katerina Garane et al.
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Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Katerina Garane et al.
Katerina Garane et al.
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Short summary
The Sentinel-5 Precursor TROPOMI Near-Real Time, NRTI, and Offline, OFFL, total ozone column (TOC) products are validated against direct-sun and twilight zenith-sky ground-based TOC measurements and other already known space-borne sensors. The results show that the TROPOMI TOC measurements are in very good agreement with the ground-based and satellite sensors' measurements and that they are well within the product requirements.
The Sentinel-5 Precursor TROPOMI Near-Real Time, NRTI, and Offline, OFFL, total ozone column...
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