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| Titel |
Influence of the aerosol solar extinction on photochemistry during the 2010 Russian wildfires episode |
| VerfasserIn |
J. C. Péré, B. Bessagnet, V. Pont, M. Mallet, F. Minvielle |
| 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. 19 ; Nr. 15, no. 19 (2015-10-02), S.10983-10998 |
| Datensatznummer |
250120072
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| Publikation (Nr.) |
 copernicus.org/acp-15-10983-2015.pdf |
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| Zusammenfassung |
| In this work, impact of aerosol solar extinction on the photochemistry over
eastern Europe during the 2010 wildfires episode is discussed for the period
from 5 to 12 August 2010, which coincides to the peak of fire activity. The
methodology is based on an online coupling between the chemistry-transport
model CHIMERE (extended by an aerosol optical module) and the radiative
transfer code TUV. Results of simulations indicate an important influence of
the aerosol solar extinction, in terms of intensity and spatial extent, with
a reduction of the photolysis rates of NO2 and O3 up to 50 % (in
daytime average) along the aerosol plume transport. At a regional scale,
these changes in photolysis rates lead to a 3–15 % increase in the
NO2 daytime concentration and to an ozone reduction near the surface of
1–12 %. The ozone reduction is shown to occur over the entire boundary
layer, where aerosols are located. Also, the total aerosol mass concentration
(PM10) is shown to be decreased by 1–2 %, on average during the
studied period, caused by a reduced formation of secondary aerosols such as
sulfates and secondary organics (4–10 %) when aerosol impact on
photolysis rates is included. In terms of model performance, comparisons of
simulations with air quality measurements at Moscow indicate that an explicit
representation of aerosols interaction with photolysis rates tend to improve
the estimation of the near-surface concentration of ozone and nitrogen
dioxide as well as the formation of inorganic aerosol species such as
ammonium, nitrates and sulfates. |
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