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| Titel |
Use of North American and European air quality networks to evaluate global chemistry–climate modeling of surface ozone |
| VerfasserIn |
J. L. Schnell, M. J. Prather, B. Josse, V. Naik, L. W. Horowitz, P. Cameron-Smith, D. Bergmann, G. Zeng, D. A. Plummer, K. Sudo, T. Nagashima, D. T. Shindell  , G. Faluvegi, S. A. Strode |
| 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 ; 15, no. 18 ; Nr. 15, no. 18 (2015-09-25), S.10581-10596 |
| Datensatznummer |
250120051
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| Publikation (Nr.) |
 copernicus.org/acp-15-10581-2015.pdf |
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| Zusammenfassung |
| We test the current generation of global chemistry–climate models in their
ability to simulate observed, present-day surface ozone. Models are evaluated
against hourly surface ozone from 4217 stations in North America and Europe
that are averaged over 1° × 1° grid cells, allowing
commensurate model–measurement comparison. Models are generally biased high
during all hours of the day and in all regions. Most models simulate the
shape of regional summertime diurnal and annual cycles well, correctly
matching the timing of hourly (~ 15:00 local time (LT)) and monthly (mid-June) peak
surface ozone abundance. The amplitude of these cycles is less successfully
matched. The observed summertime diurnal range (~ 25 ppb) is
underestimated in all regions by about 7 ppb, and the observed seasonal
range (~ 21 ppb) is underestimated by about 5 ppb except in the most
polluted regions, where it is overestimated by about 5 ppb. The models
generally match the pattern of the observed summertime ozone enhancement, but
they overestimate its magnitude in most regions. Most models capture the
observed distribution of extreme episode sizes, correctly showing that about
80 % of individual extreme events occur in large-scale, multi-day episodes
of more than 100 grid cells. The models also match the observed linear
relationship between episode size and a measure of episode intensity, which
shows increases in ozone abundance by up to 6 ppb for larger-sized episodes.
We conclude that the skill of the models evaluated here provides confidence
in their projections of future surface ozone. |
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