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| Titel |
Sensitivity analyses of OH missing sinks over Tokyo metropolitan area in the summer of 2007 |
| VerfasserIn |
S. Chatani, N. Shimo, S. Matsunaga, Y. Kajii, S. Kato, Y. Nakashima, K. Miyazaki, K. Ishii, H. Ueno |
| 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 ; 9, no. 22 ; Nr. 9, no. 22 (2009-11-27), S.8975-8986 |
| Datensatznummer |
250007772
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| Publikation (Nr.) |
 copernicus.org/acp-9-8975-2009.pdf |
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| Zusammenfassung |
| OH reactivity is one of key indicators which reflect impacts of
photochemical reactions in the atmosphere. An observation campaign has been
conducted in the summer of 2007 at the heart of Tokyo metropolitan area to
measure OH reactivity. The total OH reactivity measured directly by the
laser-induced pump and probe technique was higher than the sum of the OH
reactivity calculated from concentrations and reaction rate coefficients of
individual species measured in this campaign. And then, three-dimensional
air quality simulation has been conducted to evaluate the simulation
performance on the total OH reactivity including "missing sinks", which
correspond to the difference between the measured and calculated total OH
reactivity. The simulated OH reactivity is significantly underestimated
because the OH reactivity of volatile organic compounds (VOCs) and missing
sinks are underestimated. When scaling factors are applied to input
emissions and boundary concentrations, a good agreement is observed between
the simulated and measured concentrations of VOCs. However, the simulated OH
reactivity of missing sinks is still underestimated. Therefore, impacts of
unidentified missing sinks are investigated through sensitivity analyses. In
the cases that unknown secondary products are assumed to account for
unidentified missing sinks, they tend to suppress formation of secondary
aerosol components and enhance formation of ozone. In the cases that
unidentified primary emitted species are assumed to account for unidentified
missing sinks, a variety of impacts may be observed, which could serve as
precursors of secondary organic aerosols (SOA) and significantly increase
SOA formation. Missing sinks are considered to play an important role in the
atmosphere over Tokyo metropolitan area. |
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