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| Titel |
Development of an aerosol microphysical module: Aerosol Two-dimensional bin module for foRmation and Aging Simulation (ATRAS) |
| VerfasserIn |
H. Matsui, M. Koike, Y. Kondo, J. D. Fast, M. Takigawa |
| 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 ; 14, no. 18 ; Nr. 14, no. 18 (2014-09-30), S.10315-10331 |
| Datensatznummer |
250119071
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| Publikation (Nr.) |
 copernicus.org/acp-14-10315-2014.pdf |
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| Zusammenfassung |
| Number concentrations, size distributions, and mixing states of aerosols are
essential parameters for accurate estimations of aerosol direct and indirect
effects. In this study, we develop an aerosol module, designated the Aerosol
Two-dimensional bin module for foRmation and Aging Simulation (ATRAS), that
can explicitly represent these parameters by considering new particle
formation (NPF), black carbon (BC) aging, and secondary organic aerosol
(SOA) processes. A two-dimensional bin representation is used for particles
with dry diameters from 40 nm to 10 μm to resolve both aerosol sizes
(12 bins) and BC mixing states (10 bins) for a total of 120 bins. The
particles with diameters between 1 and 40 nm are resolved using additional
eight size bins to calculate NPF. The ATRAS module is implemented in the WRF-Chem
model and applied to examine the sensitivity of simulated mass, number, size
distributions, and optical and radiative parameters of aerosols to NPF, BC
aging, and SOA processes over East Asia during the spring of 2009. The BC
absorption enhancement by coating materials is about 50% over East Asia
during the spring, and the contribution of SOA processes to the absorption
enhancement is estimated to be 10–20% over northern East Asia and 20–35% over southern East Asia. A clear north–south contrast is also
found between the impacts of NPF and SOA processes on cloud condensation
nuclei (CCN) concentrations: NPF increases CCN concentrations at higher
supersaturations (smaller particles) over northern East Asia, whereas SOA
increases CCN concentrations at lower supersaturations (larger particles)
over southern East Asia. The application of ATRAS in East Asia also shows
that the impact of each process on each optical and radiative parameter
depends strongly on the process and the parameter in question. The module
can be used in the future as a benchmark model to evaluate the accuracy of
simpler aerosol models and examine interactions between NPF, BC aging, and
SOA processes under different meteorological conditions and emissions. |
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