 |
| Titel |
Tropospheric ozone climatology over Beijing: analysis of aircraft data from the MOZAIC program |
| VerfasserIn |
A. J. Ding, T. Wang, V. Thouret, J.-P. Cammas, P. Nédélec |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 1 ; Nr. 8, no. 1 (2008-01-04), S.1-13 |
| Datensatznummer |
250005331
|
| Publikation (Nr.) |
 copernicus.org/acp-8-1-2008.pdf |
|
|
|
|
|
| Zusammenfassung |
| Ozone (O3) profiles recorded over Beijing from 1995 to 2005 by the
Measurement of Ozone and Water Vapor by Airbus In-Service Aircraft (MOZAIC)
program were analyzed to provide a first climatology of tropospheric O3
over Beijing and the North China Plains (NCPs), one of the most populated and
polluted regions in China. A pooled method was adopted in the data analysis
to reduce the influence of irregular sampling frequency. The tropospheric
O3 over Beijing shows a seasonal and vertical distribution typical of
mid-latitude locations in the Northern Hemisphere, but has higher daytime
concentrations in the lower troposphere, when compared to New York City,
Tokyo, and Paris at similar latitude. The tropospheric O3 over Beijing
exhibits a common summer maximum and a winter minimum, with a broad summer
maximum in the middle troposphere and a narrower early summer (June) peak in
the lower troposphere. Examination of meteorological and satellite data
suggests that the lower tropospheric O3 maximum in June is a result of
strong photochemical production, transport of regional pollution, and
possibly also more intense burnings of biomass in Central-Eastern China.
Trajectory analysis indicates that in summer the regional pollution from
the NCPs, maybe mixed with urban plumes from Beijing, played important
roles on the high O3 concentrations in the boundary layer, but had
limited impact on the O3 concentrations in the middle troposphere. A
comparison of the data recorded before and after 2000 reveals that O3 in
the lower troposphere over Beijing had a strong positive trend (approximately
2% per year from 1995 to 2005) in contrast to a flat or a decreasing trend
over Tokyo, New York City, and Paris, indicating worsening photochemical
pollution in Beijing and the NCPs. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|