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| Titel |
Rates and regimes of photochemical ozone production over Central East China in June 2006: a box model analysis using comprehensive measurements of ozone precursors |
| VerfasserIn |
Y. Kanaya, P. Pochanart, Y. Liu, J. Li, H. Tanimoto, S. Kato, J. Suthawaree, S. Inomata, F. Taketani, K. Okuzawa, K. Kawamura, H. Akimoto, Z. F. Wang |
| 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 ; 9, no. 20 ; Nr. 9, no. 20 (2009-10-16), S.7711-7723 |
| Datensatznummer |
250007687
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| Publikation (Nr.) |
 copernicus.org/acp-9-7711-2009.pdf |
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| Zusammenfassung |
| An observation-based box model approach was undertaken to estimate
concentrations of OH, HO2, and RO2 radicals and the net
photochemical production rate of ozone at the top of Mount Tai, located in
the middle of Central East China, in June 2006. The model calculation was
constrained by the measurements of O3, H2O, CO, NO, NO2,
hydrocarbon, HCHO, and CH3CHO concentrations, and temperature and J
values. The net production rate of ozone was estimated to be 6.4 ppb h−1
as a 6-h average (09:00–15:00 CST), suggesting 58±37 ppb of
ozone is produced in one day. Thus the daytime buildup of ozone recorded at
the mountain top as ~23 ppb on average is likely affected by in situ
photochemistry as well as by the upward transport of polluted air mass in
the daytime. On days with high ozone concentrations (hourly values exceeding
100 ppb at least once), in situ photochemistry was more active than it was
on low ozone days, suggesting that in situ photochemistry is an important
factor controlling ozone concentrations. Sensitivity model runs for which
different NOx and hydrocarbon concentrations were assumed suggested
that the ozone production occurred normally under NOx-limited
conditions, with some exceptional periods (under
volatile-organic-compound-limited conditions) in which there was fresh
pollution. We also examined the possible influence of the heterogeneous loss
of gaseous HO2 radicals in contact with aerosol particle surfaces on
the rate and regimes of ozone production. |
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