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Preprints
https://doi.org/10.5194/acp-2020-987
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-987
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Oct 2020

30 Oct 2020

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This preprint is currently under review for the journal ACP.

Evaluation of the LOTOS-EUROS NO2 simulations using ground-based measurements and S5P/TROPOMI observations over Greece

Ioanna Skoulidou1, Maria-Elissavet Koukouli1, Astrid Manders2, Arjo Segers2, Dimitris Karagkiozidis1, Myrto Gratsea3, Dimitris Balis1, Alkiviadis Bais1, Evangelos Gerasopoulos3, Trisevgeni Stavrakou4, Jos van Geffen5, Henk Eskes5, and Andreas Richter6 Ioanna Skoulidou et al.
  • 1Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Greece
  • 2TNO, Climate, Air and Sustainability, Utrecht, The Netherlands
  • 3Institute for Environmental Research and Sustainable Development, National Observatory of Athens, Greece
  • 4Royal Belgian Institute for Space Aeronomy, Brussels, Belgium
  • 5Royal Netherlands Meteorological Institute (KNMI), De Bilt, The Netherlands
  • 6Institute of Environmental Physics and Remote Sensing, University of Bremen, Germany

Abstract. The evaluation of chemical transport models, CTMs, is essential for the assessment of their performance regarding the physical and chemical parameterizations used. While regional CTMs have been widely used and evaluated over Europe, their validation over Greece is limited. In this study, we investigate the performance of the LOTOS-EUROS v2.2.001 regional chemical transport model in simulating nitrogen dioxide, NO2, over Greece from June to December 2018. In-situ NO2 measurements obtained from the National Air Pollution Monitoring Network are compared with surface simulations over the two major cities of Greece, Athens and Thessaloniki. The model reproduces well the spatial variability of the measured NO2 with a spatial correlation coefficient of 0.85 for the period between June and December 2018. About half of the 14 air quality monitoring stations show a good temporal correlation to the simulations, higher than 0.6, during daytime (12–15 p.m. local time), while the corresponding biases are negative. Most stations show stronger negative biases during winter than in summer. Furthermore, the simulated tropospheric NO2 columns are evaluated against ground-based MAX-DOAS NO2 measurements and space-borne Sentinel 5-Precursor TROPOMI tropospheric NO2 observations in July and December 2018. LOTOS-EUROS captures better the NO2 temporal variability in December (0.61 and 0.81) than in July (0.50 and 0.21) when compared to the corresponding measurements of the MAX-DOAS instruments in Thessaloniki and the rural azimuth viewing direction in Athens respectively. The urban azimuth viewing direction in Athens region however shows a better correlation in July than in December (0.41 and 0.19, respectively). LOTOS-EUROS NO2 columns over Athens and Thessaloniki agree well with the TROPOMI observations showing higher spatial correlation in July (0.95 and 0.82, respectively) than in December (0.82 and 0.66, respectively) while the relative temporal correlations are higher during winter. Overall, the comparison of the simulations with the TROPOMI observations shows a model underestimation in summer and an overestimation in winter both in Athens and Thessaloniki. Updated emissions for the simulations and model improvements when extreme values of boundary layer height are encountered are further suggested.

Ioanna Skoulidou et al.

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Ioanna Skoulidou et al.

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Short summary
The performance of LOTOS-EUROS v2.2.001 regional chemical transport model NO2 simulations are investigated over Greece from June to December 2018. Comparison with in-situ NO2 measurements show a spatial correlation coefficient of 0.85 while the model underestimates the concentrations mostly during daytime (12 to 15 pm local time). Further the simulated tropospheric NO2 columns are evaluated against ground-based MAX-DOAS NO2 measurements and S5P/TROPOMi observations for July and December 2018.
The performance of LOTOS-EUROS v2.2.001 regional chemical transport model NO2 simulations are...
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