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| Titel |
Seasonal and spatial variability of surface ozone over China: contributions from background and domestic pollution |
| VerfasserIn |
Y. Wang, Y. Zhang, J. Hao, M. Luo |
| 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. 7 ; Nr. 11, no. 7 (2011-04-15), S.3511-3525 |
| Datensatznummer |
250009608
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| Publikation (Nr.) |
 copernicus.org/acp-11-3511-2011.pdf |
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| Zusammenfassung |
| Both observations and a 3-D chemical transport model suggest that surface
ozone over populated eastern China features a summertime trough and that the
month when surface ozone peaks differs by latitude and region.
Source-receptor analysis is used to quantify the contributions of background
ozone and Chinese anthropogenic emissions on this variability. Annual mean
background ozone over China shows a spatial gradient from 55 ppbv in the
northwest to 20 ppbv in the southeast, corresponding with changes in
topography and ozone lifetime. Pollution background ozone (annual mean of
12.6 ppbv) shows a minimum in the summer and maximum in the spring. On the
monthly-mean basis, Chinese pollution ozone (CPO) has a peak of 20–25 ppbv
in June north of the Yangtze River and in October south of it, which explains the
peaks of surface ozone in these months. The summertime trough in surface
ozone over eastern China can be explained by the decrease of background
ozone from spring to summer (by −15 ppbv regionally averaged over eastern
China). Tagged simulations suggest that long-range transport of ozone from
northern mid-latitude continents (including Europe and North America)
reaches a minimum in the summer, whereas ozone from Southeast Asia exhibits
a maximum in the summer over eastern China. This contrast in seasonality
provides clear evidence that the seasonal switch in monsoonal wind patterns
plays a significant role in determining the seasonality of background ozone
over China. |
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