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| Titel |
Nonlinear response of ozone to precursor emission changes in China: a modeling study using response surface methodology |
| VerfasserIn |
J. Xing, S. X. Wang, C. Jang, Y. Zhu, J. M. Hao |
| 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 ; 11, no. 10 ; Nr. 11, no. 10 (2011-05-31), S.5027-5044 |
| Datensatznummer |
250009770
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| Publikation (Nr.) |
 copernicus.org/acp-11-5027-2011.pdf |
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| Zusammenfassung |
| Statistical response surface methodology (RSM) is successfully applied for a
Community Multi-scale Air Quality model (CMAQ) analysis of ozone sensitivity
studies. Prediction performance has been demonstrated through cross
validation, out-of-sample validation and isopleth validation. Sample methods
and key parameters, including the maximum numbers of variables involved in
statistical interpolation and training samples have been tested and selected
through computational experiments. Overall impacts from individual source
categories which include local/regional NOx and VOC emission sources
and NOx emissions from power plants for three megacities – Beijing,
Shanghai and Guangzhou – were evaluated using an RSM analysis of a July 2005
modeling study. NOx control appears to be beneficial for ozone
reduction in the downwind areas which usually experience high ozone levels,
and NOx control is likely to be more effective than anthropogenic VOC
control during periods of heavy photochemical pollution. Regional NOx
source categories are strong contributors to surface ozone mixing ratios in
three megacities. Local NOx emission control without regional
involvement may raise the risk of increasing urban ozone levels due to the
VOC-limited conditions. However, local NOx control provides
considerable reduction of ozone in upper layers (up to 1 km where the ozone
chemistry is NOx-limited) and helps improve regional air quality in
downwind areas. Stricter NOx emission control has a substantial effect
on ozone reduction because of the shift from VOC-limited to NOx-limited
chemistry. Therefore, NOx emission control should be significantly
enhanced to reduce ozone pollution in China. |
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