3 Unravelling the Origin of High Ozone Concentrations …
21
non-road transport sector is a contributor to O 3 as significant as the on-road transport
over inland regions (10–19% of the daily mean O 3 concentration in episodes).
Questions
Questioner: Mike Moran
Question: What are your future works with the ISAM tool?
Answer: This integrated source apportionment approach has demonstrated several
advantages. First, it allows identifying the main sources contributing to high O 3 levels
under actual atmospheric conditions, which is a preliminary step towards designing
refined and efficient emission abatement scenarios. Second, as we show below, it
supports enhanced model evaluation and therefore potential model improvements by
identifying problems in emission estimates (sectors or regions) or chemical boundary
conditions. Due to the potential of the tool, we plan further detailed and longer O 3
source apportionment studies targeting other nonattainment regions in Europe, which
will be necessary prior to define local mitigation measurements that complement
national and European-wide strategies to reach the European O 3 objectives.
Acknowledgements This study was supported by the Spanish Ministry of Economy and Competitiveness and FEDER funds under the project PAISA (CGL2016-75725-R) and the “Red Española
de Supercomputación” (AECT-2017-1-0008). The views expressed in this article are those of the
authors and do not necessarily represent the views or policies of the U.S. Environmental Protection
Agency.
References
1. R.H.F. Kwok, K.R. Baker, S.L. Napelenok, G.S. Tonnesen, Photochemical grid model implementation and application of VOC, NO x , and O 3 source apportionment. Geosci. Model Dev. 8,
99–114 (2015)
2. M.M. Millán, R. Salvador, E. Mantilla, G. Kallos, Photooxidant dynamics in the Mediterranean
basin in summer: results from European research projects. J. Geophys. Res. 102, 8811–8823
(1997)
3. M.T. Pay, F. Martínez, M. Guevara, J.M. Baldasano, Air quality forecasts at kilometer scale grid
over Spanish complex terrains. Geosci. Model Dev. 7, 1979–1999 (2014)
4. V. Valverde, M.T. Pay, J.M. Baldasano, Circulation-type classification derived on a climatic
basis to study air quality dynamics over the Iberian Peninsula. Int. J. Climatol. 35(8) (2014)
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