 |
| Titel |
Simulation of particle formation and number concentration over the Eastern United States with the WRF-Chem + APM model |
| VerfasserIn |
G. Luo, F. Yu |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 22 ; Nr. 11, no. 22 (2011-11-21), S.11521-11533 |
| Datensatznummer |
250010203
|
| Publikation (Nr.) |
 copernicus.org/acp-11-11521-2011.pdf |
|
|
|
|
|
| Zusammenfassung |
| Aerosol nucleation events, widely observed at various locations around the
globe, are a significant source of cloud condensation nuclei (CCN) which
determines aerosol indirect radiative forcing. In this study, a
size-resolved, computationally efficient, advanced particle microphysics
(APM) model, which has been previously incorporated into a global chemistry
transport model (GEOS-Chem), is integrated into the Weather Research and
Forecast model coupled with Chemistry (WRF-Chem) to study new particle
formation and its contribution to particle number concentration and CCN abundance over the Eastern United States. Size- and composition-resolved
aerosol properties from GEOS-Chem + APM simulations are used to initialize
and provide boundary conditions for the WRF-Chem + APM model. The modeling
results have been evaluated with the relevant measurements obtained during
the INTEX-A field campaign in the summer of 2004. Model simulation captures
the high concentrations of SO2 and CN10 at surface layer and source
regions but underpredicts the values in the upper troposphere. The particle
formation and number concentrations simulated by WRF-Chem + APM are
generally consistent with those based on GEOS-Chem + APM over the Eastern
United States, but the WRF-Chem + APM simulation has a much higher spatial
resolution and can reveal urban and even plume scale processes. Our
simulations show that high values of nucleation rates are largely confined
to the regions of high SO2 emissions and that aerosol nucleation
dominates the spatial and temporal distributions of condensation nuclei
lager than 10 nm (CN10). Similarly, high concentrations of CCN at
supersaturation of 0.4% (CCN0.4) are generally confined to SO2
source regions, with the highest monthly (July) mean CCN0.4 value exceeding
1600 # cm−3 in the lower troposphere over Indiana and Ohio.
Nucleation and subsequent growth of secondary particles are important
sources of CCN0.4, accounting for more than 80% in most parts of the
Eastern United States. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|