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| Titel |
Analysis of NO, NO2, O3, NOx and level of oxidant (OX) measured at Seville (Spain) in two monitoring stations during one year |
| VerfasserIn |
Alberto Notario, Iván Bravo, Jose Antonio Adame, Yolanda Díaz-de-Mera, Alfonso Aranda, Ana Rodríguez, Diana Rodríguez |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250048742
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| Zusammenfassung |
| The variation of oxidant OX concentrations with NOx is investigated, for the first time in the
south of the Iberian Peninsula. For this purpose, ambient concentrations of NO, NO2
and ozone are measured continuously at two monitoring stations with different
characteristics in Seville (Andalusia region). The aim of this work is to contribute
to a better understanding of atmospheric sources of OX in the metropolitan area
of Seville, as a stepping stone towards the understanding of its prevalence in the
region as a whole. The concentration of OX can usually be described in terms of the
sum of a NOx independent regional contribution (as the O3 background), and a
linearly NOx dependent local contribution. Therefore, this study will aid in the
progress towards understanding the OX dynamic at sites located in the Western
Mediterranean area of Spain, where there is an undeniable air quality problem. The
diurnal cycles of NO, NO2 and O3 registered in this study show that the urban
atmosphere of this Southern European city is strongly affected by motor traffic and
photochemistry. According to obtained results, the highest daily concentration of the primary
pollutant NO was observed overnight at the urban traffic station in Torneo, at the
centre of Seville, which is an area with very high traffic emissions. Similar results
were observed in the case of NO2, but without the great disparity between the two
monitoring stations, as in the case of NO. A comparatively high concentration of O3 was
measured at the peripheral station in Aljarafe, during the summer. This result indicates
that downwind from urban centres, O3 may peak (in the afternoon or even after
dark), dependent on emission levels at the centre, and air currents from the centre
containing O3, and other secondary pollutants that were formed during daylight
hours. |
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