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| Titel |
Analysis of Recent European Surface Ozone Trends Considering Site Representativeness and Mete-orology |
| VerfasserIn |
S. Henne, Z. Fleming, D. Brunner, J. Klausen, B. Buchmann |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027519
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| Zusammenfassung |
| Recent trends of surface ozone (O3) within Europe vary substantially depending on the
location and surroundings of a measurement site. The influence of long-range transport from
North America and Asia, changes in stratosphere-troposphere exchange, increase in lower
stratospheric O3 and changes in advection patterns are possible drivers for the observed
O3 trends. O3 concentrations greatly depend on meteorology (temperature and
radiation) and local to regional emissions of precursor gases and therefore on the
representativeness of a site (e.g. background vs. urban site) and regional emission
trends.
We investigated the representativeness of 1264 “rural” and “suburban” background sites (as
available through the European Environment Agency (EEA )Airbase database) by analysing
population density, land cover and topography in the surrounding of the sites. A hierarchical
clustering method was applied to derive an independent site categorization. The two area
types as specified by EEA are split into 7 categories: elevated, lowered, remote, rural,
rural/coastal, rural/polluted, suburban.
Furthermore, we analysed the trend of surface O3 and Ox (O3+NO2) for the mentioned sites
based on the above site categorization, local meteorology and precursor emission trends. Of
the 1264 sites 161 possess sufficiently long and complete O3 data series suitable for robust
trend estimation, while for 100 sites both O3 and NO2 data are available. We present a
strategy for further data exclusion based on available data quality information and a break
detection algorithm. First results of the trend analysis applying different statistical approaches
are discussed. |
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