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| Titel |
Photochemical modelling in the Po basin with focus on formaldehyde and ozone |
| VerfasserIn |
L. Liu, F. Flatøy, C. Ordóñez, G. O. Braathen, C. Hak, W. Junkermann, S. Andreani-Aksoyoglu, J. Mellqvist, B. Galle, A. S. H. Prévôt, I. S. A. Isaksen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 7, no. 1 ; Nr. 7, no. 1 (2007-01-11), S.121-137 |
| Datensatznummer |
250004349
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| Publikation (Nr.) |
 copernicus.org/acp-7-121-2007.pdf |
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| Zusammenfassung |
| As part of the EU project FORMAT (Formaldehyde as a
Tracer of Oxidation in the Troposphere), a field campaign was carried out in
the vicinity of Milan during the summer of 2002. Results from a 3-D regional
chemical transport model (NILU RCTM) were used to interpret the observations
focusing primarily on HCHO and ozone. The performance of the model was
assessed by comparing model results with ground based and aircraft
measurements. The model results show good agreement with surface
measurements, and the model is able to reproduce the photochemical episodes
during fair weather days. The comparison indicates that the model can
represent well the HCHO concentrations as well as their temporal and spatial
variability. The relationship between HCHO and (O3×H2O)
was used to validate the model ability to predict the HCHO concentrations.
Further analysis revealed the importance of the representativeness of
different instruments: in-situ concentrations might be locally enhanced by
emissions, while long path measurements over a forest can be influenced by
rapid formation of HCHO from isoprene. The model is able to capture the
plume from the city of Milan and the modelled levels agree generally well
with the aircraft measurements, although the wind fields used in the model
can lead to a displacement of the ozone plume. During the campaign period,
O3 levels were seldom higher than 80 ppb, the peak surface ozone maxima
reached 90 ppb. Those relatively low values can be explained by low
emissions during the August vacation and unstable weather conditions in this
period. The modelled ΔO3/ΔNOz slope at Alzate of
5.1 agrees well with the measured slope of 4.9. |
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