Abstract
The NOx-emission trend has been evaluated over Europe using the LOTOS-EUROS model and the NO2 tropospheric columns from OMI.
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Acknowledgement
The work described in this paper is supported by ENERGEO, a Collaborative Project (2009–2012) funded by the European Union under the 7th Framework Programme and TNO internal funding.
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Questions and Answers
Questioner Name: W. Lefebvre
Q: How does the changing NO2/NOx ratio affect your results?.
A: The downward trend observed in NOx emissions partly resulted in the development of new technologies that influence the ratio. Changes in NO2/NOX ratios during the period of interest may result in additional uncertainty in NOX emissions.
Questioner Name: J. Silver
Q: The comparison between OMI and LOTOS-EUROS showed a seasonal bias. Is this mainly due to the model or the observations?
A: Many studies shown this bias between chemistry transport model and observation. The discrepancies observed between the tropospheric OMI NO2 tropospheric column and its modelled counterparts should occur mainly in the higher part of the atmosphere due to a lack of sources such as lightning and incorrect estimates of the lifetime of NO2 at higher altitude. On the other hand, comparison studies between OMI and ground based observations have also shown that OMI was biased high.
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Curier, L., Kranenburg, R., Timmermans, R., Segers, A., Eskes, H., Schaap, M. (2014). Synergistic Use of LOTOS-EUROS and NO2 Tropospheric Columns to Evaluate the NOX Emission Trends Over Europe. In: Steyn, D., Builtjes, P., Timmermans, R. (eds) Air Pollution Modeling and its Application XXII. NATO Science for Peace and Security Series C: Environmental Security. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-5577-2_41
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DOI: https://doi.org/10.1007/978-94-007-5577-2_41
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