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| Titel |
The IPAC-NC field campaign: a pollution and oxidization pool in the lower atmosphere over Huabei, China |
| VerfasserIn |
J. Z. Ma, W. Wang, Y. Chen, H. J. Liu, P. Yan, G. A. Ding, M. L. Wang, J. Sun, J. Lelieveld  |
| 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 ; 12, no. 9 ; Nr. 12, no. 9 (2012-05-03), S.3883-3908 |
| Datensatznummer |
250011109
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| Publikation (Nr.) |
 copernicus.org/acp-12-3883-2012.pdf |
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| Zusammenfassung |
| In the past decades, regional air pollution characterized by photochemical
smog and grey haze-fog has become a severe environmental problem in China.
To investigate this, a field measurement campaign was performed in the
Huabei region, located between 32–42° N latitude in eastern China,
during the period 2 April–16 May 2006 as part of the project "Influence
of Pollution on Aerosols and Cloud Microphysics in North China" (IPAC-NC).
It appeared that strong pollution emissions from urban and industrial
centers tend to accumulate in the lower atmosphere over the central area of
Huabei. We observed widespread, very high SO2 mixing ratios, about
20–40 ppbv at 0.5–1.5 km altitude and 10–30 ppbv at 1.5–3.0 km altitude.
Average CO mixing ratios were 0.65–0.7 ppmv at 0.5–1.5 km altitude, and very
high CO around 1 ppmv was observed during some flights, and even higher
levels at the surface. We find the high pollution concentrations to be
associated with enhanced levels of OH and HO2 radicals, calculated with
a chemical box model constrained by the measurements. In the upper part of
the boundary layer and in the lower free troposphere, high CO and SO2
compete with relatively less NO2 in reacting with OH, being efficiently
recycled through HO2, preventing a net loss of HOx radicals. In
addition to reactive hydrocarbons and CO, the oxidation of SO2 causes
significant ozone production over Huabei (up to ~13% or 2.0 ppbv h−1
at 0.8 km altitude). Our results indicate that the lower atmosphere
over Huabei is not only strongly polluted but also acts as an oxidation pool,
with pollutants undergoing very active photochemistry over this part of
China. |
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