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| Titel |
A parameterization of sub-grid particle formation in sulfur-rich plumes for global- and regional-scale models |
| VerfasserIn |
R. G. Stevens, J. R. Pierce |
| 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 ; 13, no. 23 ; Nr. 13, no. 23 (2013-12-13), S.12117-12133 |
| Datensatznummer |
250085879
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| Publikation (Nr.) |
 copernicus.org/acp-13-12117-2013.pdf |
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| Zusammenfassung |
| New-particle formation in the plumes of coal-fired power plants and other
anthropogenic sulfur sources may be an important source of particles in the
atmosphere. It remains unclear, however, how best to reproduce this formation
in global and regional aerosol models with grid-box lengths that are tens of
kilometres and larger. Based on the results of the System for Atmospheric
Modelling (SAM), a large-eddy simulation/cloud-resolving model (LES/CRM) with
online two-moment aerosol sectional (TOMAS) microphysics, we have developed a
computationally efficient, but physically based, parameterization that
predicts the characteristics of aerosol formed within sulfur-rich plumes
based on parameters commonly available in global- and regional-scale models.
Given large-scale mean meteorological parameters ((1) wind speed, (2)
boundary-layer height and (3) downward shortwave radiative flux), (4)
emissions of SO2 and (5) NOx from the source, (6) mean
background condensation sink, (7) background SO2 and (8) NOx
concentrations, and (9) the desired distance from the source, the
parameterization will predict (1) the fraction of the emitted SO2 that is
oxidized to H2SO4, (2) the fraction of that H2SO4 that forms new
particles instead of condensing onto pre-existing particles, (3) the mean mass
per particle of the newly formed particles, and (4) the number of newly
formed particles per kilogram SO2 emitted. The parameterization we
describe here should allow for more accurate predictions of aerosol size
distributions and a greater confidence in the effects of aerosols in climate
and health studies. |
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