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| Titel |
Trends in Surface Ozone Concentrations at Bucharest, Romania from 2005 to 2007 |
| VerfasserIn |
Sabina Stefan, Laurentiu Zagar, Raluca Barladeanu, Gilda Rusu-Zagar |
| 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 |
250049408
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| Zusammenfassung |
| Data from six urban sites in Bucharest, Romania are analyzed to investigate the surface ozone
concentrations, seasonal changes and long-term trends. The monitoring sites are
in EPA (Environmental Protection Agency) network of Bucharest and analyzed
period is from 2005 to 2007. The results have shown the highest values of ozone
concentrations in summer, in weekend and in the afternoon of the day. In 2005 the ozone
concentration values were larger than in 2006 and 2007. In 2005 year the O3 has had
largest values starting with February. The values decrease from August to December.
The smallest values are in December and January in all the three years. In general,
ozone concentrations in Bucharest are found to have a negative trend at all sites
for this period. Monthly mean concentrations for all the three years have shown a
clear pattern with maximum values during spring or early summer and minimum in
winter.
The seasonal variation was the net result of a number of processes such as dry deposition,
photochemical loss (titration with NOx) and formation, and varying precursor concentrations
of the ozone.
In addition to the seasonal variation, ozone concentrations have presented a variation on a
shorter time scale. The diurnal variation was also a result of the variation in vertical
mixing, surface dry deposition and photochemistry. Thus, traffic sites generally have
shown the pronounced diurnal cycles in spring and summer. In general, the lowest
concentrations are found in early morning and the highest in the afternoon. Back trajectories
analysis estimated by the HYSPLIT model was used for understanding how short-term
variability in surface ozone depends on transport into Bucharest. Concentrations were
highest for air masses characterized by dry, warm conditions. We combined air mass
characteristics and trajectories approaches to provide a useful characterization of air quality
conditions. |
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