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| Titel |
Development of the RAQM2 aerosol chemical transport model and predictions of the Northeast Asian aerosol mass, size, chemistry, and mixing type |
| VerfasserIn |
M. Kajino, Y. Inomata, K. Sato, H. Ueda, Z. Han, J. An, G. Katata, M. Deushi, T. Maki, N. Oshima, J. Kurokawa, T. Ohara, A. Takami, S. Hatakeyama |
| 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. 24 ; Nr. 12, no. 24 (2012-12-17), S.11833-11856 |
| Datensatznummer |
250011664
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| Publikation (Nr.) |
 copernicus.org/acp-12-11833-2012.pdf |
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| Zusammenfassung |
| A new aerosol chemical transport model, the Regional Air Quality Model 2
(RAQM2), was developed to simulate the Asian air quality. We implemented a
simple version of a triple-moment modal aerosol dynamics model (MADMS) and
achieved a completely dynamic (non-equilibrium) solution of a gas-to-particle
mass transfer over a wide range of aerosol diameters from 1 nm to
super-μm. To consider a variety of atmospheric aerosol properties, a
category approach was utilized in which the aerosols were distributed into
four categories: particles in the Aitken mode (ATK), soot-free particles in
the accumulation mode (ACM), soot aggregates (AGR), and particles in the
coarse mode (COR). The aerosol size distribution in each category is
characterized by a single mode. The condensation, evaporation, and Brownian
coagulations for each mode were solved dynamically. A regional-scale
simulation (Δx = 60 km) was performed for the entire year of 2006
covering the Northeast Asian region. The modeled PM1/bulk ratios of the
chemical components were consistent with observations, indicating that the
simulated aerosol mixing types were consistent with those in nature. The
non–sea-salt SO42− mixed with ATK + ACM was the largest at Hedo in
summer, whereas the SOSO42− was substantially mixed with AGR in the
cold seasons. Ninety-eight percent of the modeled NO3− was mixed with
sea salt at Hedo, whereas 53.7% of the NO3− was mixed with sea
salt at Gosan, which is located upwind toward the Asian continent. The
condensation of HNO3 onto sea salt particles during transport over the
ocean accounts for the difference in the NO3− mixing type at the two
sites. Because the aerosol mixing type alters the optical properties and
cloud condensation nuclei activity, its accurate prediction and evaluation
are indispensable for aerosol-cloud-radiation interaction studies. |
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