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| Titel |
Heterogeneous chemistry: a mechanism missing in current models to explain secondary inorganic aerosol formation during the January 2013 haze episode in North China |
| VerfasserIn |
B. Zheng, Q. Zhang, Y. Zhang, K. B. He, K. Wang, G. J. Zheng, F. K. Duan, Y. L. Ma, T. Kimoto |
| 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 ; 15, no. 4 ; Nr. 15, no. 4 (2015-02-25), S.2031-2049 |
| Datensatznummer |
250119458
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| Publikation (Nr.) |
 copernicus.org/acp-15-2031-2015.pdf |
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| Zusammenfassung |
| Severe regional haze pollution events occurred in eastern and central China
in January 2013, which had adverse effects on the environment and public
health. Extremely high levels of particulate matter with aerodynamic
diameter of 2.5 μm or less (PM2.5) with dominant components of
sulfate and nitrate are responsible for the haze pollution. Although
heterogeneous chemistry is thought to play an important role in the
production of sulfate and nitrate during haze episodes, few studies have
comprehensively evaluated the effect of heterogeneous chemistry on haze
formation in China by using the 3-D models due to of a lack of treatments for
heterogeneous reactions in most climate and chemical transport models. In
this work, the WRF-CMAQ model with newly added heterogeneous reactions is
applied to East Asia to evaluate the impacts of heterogeneous chemistry and
the meteorological anomaly during January 2013 on regional haze formation.
As the parameterization of heterogeneous reactions on different types of
particles is not well established yet, we arbitrarily selected the uptake
coefficients from reactions on dust particles and then conducted several
sensitivity runs to find the value that can best match observations. The
revised CMAQ with heterogeneous chemistry not only captures the magnitude
and temporal variation of sulfate and nitrate, but also reproduces the
enhancement of relative contribution of sulfate and nitrate to PM2.5
mass from clean days to polluted haze days. These results indicate the
significant role of heterogeneous chemistry in regional haze formation and
improve the understanding of the haze formation mechanisms during the
January 2013 episode. |
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