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| Titel |
Modelling surface ozone during the 2003 heat-wave in the UK |
| VerfasserIn |
M. Vieno, A. J. Dore, D. S. Stevenson, R. Doherty, M. R. Heal, S. Reis, S. Hallsworth, L. Tarrasón, P. Wind, D. Fowler, D. Simpson, M. A. Sutton |
| 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. 16 ; Nr. 10, no. 16 (2010-08-27), S.7963-7978 |
| Datensatznummer |
250008731
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| Publikation (Nr.) |
 copernicus.org/acp-10-7963-2010.pdf |
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| Zusammenfassung |
| The EMEP4UK modelling system is a high resolution (5×5 km2)
application of the EMEP chemistry-transport model, designed for scientific
and policy studies in the UK. We demonstrate the use and performance of the
EMEP4UK system through the study of ground-level ozone (O3) during the
extreme August 2003 heat-wave. Meteorology is generated by the Weather
Research and Forecast (WRF) model, nudged every six hours with reanalysis
data. We focus on SE England, where hourly average O3 reached up to
140 ppb during the heat-wave. EMEP4UK accurately reproduces elevated O3 and
much of its day-to-day variability during the heat-wave. Key O3
precursors, nitrogen dioxide and isoprene, are less well simulated, but show
generally accurate diurnal cycles and concentrations to within a factor of
~2–3 of observations. The modelled surface O3 distribution has an
intricate spatio-temporal structure, governed by a combination of
meteorology, emissions and photochemistry. A series of sensitivity runs with
the model are used to explore the factors that influenced O3 levels
during the heat-wave. Various factors appear to be important on different
days and at different sites. Ozone imported from outside the model domain,
especially the south, is very important on several days during the
heat-wave, contributing up to 85 ppb. The effect of dry deposition is also
important on several days. Modelled isoprene concentrations are generally
best simulated if isoprene emissions are changed from the base emissions:
typically doubled, but elevated by up to a factor of five on one hot day. We
found that accurate modelling of the exact positions of nitrogen oxide and
volatile organic compound plumes is crucial for the successful simulation of
O3 at a particular time and location. Variations in temperature of ±5 K
were found to have impacts on O3 of typically less than ±10 ppb. |
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