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| Titel |
Regional and global modeling of aerosol optical properties with a size, composition, and mixing state resolved particle microphysics model |
| VerfasserIn |
F. Yu, G. Luo, X. Ma |
| 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. 13 ; Nr. 12, no. 13 (2012-07-02), S.5719-5736 |
| Datensatznummer |
250011295
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| Publikation (Nr.) |
 copernicus.org/acp-12-5719-2012.pdf |
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| Zusammenfassung |
| There exist large uncertainties in the present modeling
of physical, chemical, and optical properties of atmospheric particles. We
have recently incorporated an advanced particle microphysics (APM) model
into a global chemistry transport model (GEOS-Chem) and a regional weather
forecasting and chemistry model (WRF-Chem). Here we develop a scheme for
calculating regional and global aerosol optical depth (AOD) from detailed
aerosol information resolved by the APM model. According to GEOS-Chem-APM
simulations, in most parts of the globe, the mass of secondary species
resides mainly within secondary particles (60–90%), but in certain
regions a large fraction (up to 50–80%) can become coated on various
primary particles. Secondary species coated on black carbon and primary
organic carbon particles significantly increase the size and hygroscopicity
of these particles and thus impact their optical properties. The
GEOS-Chem-APM model captures the global spatial distributions of AOD derived
from AERONET, MODIS, and MISR measurements, generally within a factor of
~2. Our analysis indicates that modeled annual mean AODs at
all sky and clear sky conditions differ by ~20% globally
averaged and by >50% in some regions. The time series of
WRF-Chem-APM predicted AOD over the northeastern United States in June 2008
have been compared to those from seven AERONET sites. Overall, the model
mostly captures the absolute values as well as the variations of AOD at the
AERONET sites (including dramatic changes associated with the crossing of
high AOD plumes). Both GEOS-Chem and WRF-Chem simulations indicate that AOD
over the northeastern US is dominated by secondary particles and have large
spatiotemporal variations. |
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