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| Titel |
A modelling study of photochemical regimes over Europe: robustness and variability |
| VerfasserIn |
M. Beekmann, R. Vautard |
| 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 ; 10, no. 20 ; Nr. 10, no. 20 (2010-10-26), S.10067-10084 |
| Datensatznummer |
250008854
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| Publikation (Nr.) |
 copernicus.org/acp-10-10067-2010.pdf |
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| Zusammenfassung |
| The variability of the relative sensitivity of photochemical ozone formation to
volatile organic compounds (VOC) and NOx emissions, the chemical regime, over Europe during
summers 2001 to 2003 is simulated with a regional scale transport-chemistry
model. The robustness and variability of chemical regimes is shown. A VOC
sensitive regime over North-Western Europe and a mainly NOx sensitive regime
over the Mediterranean basin and Eastern Europe are found, confirming
earlier published results. The chemical regime time variability, its
robustness with respect to several environmental factors (seasonality,
interannual variability) and with respect to model uncertainty are
thoroughly analysed. For the regions with well pronounced chemical regimes
over North-Western Europe and the Mediterranean, the chemical regime
occurrence only slightly depends on the ozone target considered – daily ozone
or Ox (= O3 + NO2) maximum or mean, AOT's, SOMO35, .... For
these regions, differences between particular years and summer months are
weak, day to day variability is significant but does not change the
occurrence of one or another chemical regime. On the contrary, over
North-Eastern Germany, the chemical regime changes form one day to another
and is also dependent on the ozone target chosen. Expected decreases in
anthropogenic NOx emissions over Europe since the last and for the next few
decades have shifted and will shift chemical regimes to more NOx sensitive.
The predictive skill of chemical regime indicator species is made evident at
continental scale, extending their spatial range of applicability with
respect to earlier studies. Several sensitivity tests were performed in
order to account for major sources of model uncertainty. With the exception
of regions near ship tracks over the Mediterranean basin, the spatial
pattern of chemical regimes appears to be robust with respect to model
uncertainty for all cases tested. |
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