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| Titel |
Quantifying aerosol mixing state with entropy and diversity measures |
| VerfasserIn |
N. Riemer, M. West |
| 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. 22 ; Nr. 13, no. 22 (2013-11-25), S.11423-11439 |
| Datensatznummer |
250085835
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| Publikation (Nr.) |
 copernicus.org/acp-13-11423-2013.pdf |
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| Zusammenfassung |
| This paper presents the first quantitative metric for aerosol population
mixing state, defined as the distribution of per-particle chemical species
composition. This new metric, the mixing state index χ, is an affine
ratio of the average per-particle species diversity Dα and the bulk
population species diversity Dγ, both of which are based on
information-theoretic entropy measures. The mixing state index χ enables
the first rigorous definition of the spectrum of mixing states from so-called
external mixture to internal mixture, which is significant for aerosol
climate impacts, including aerosol optical properties and cloud condensation
nuclei activity. We illustrate the usefulness of this new mixing state
framework with model results from the stochastic particle-resolved model
PartMC-MOSAIC. These results demonstrate how the mixing state metrics evolve
with time for several archetypal cases, each of which isolates a specific
process such as coagulation, emission, or condensation. Further, we present
an analysis of the mixing state evolution for a complex urban plume case, for
which these processes occur simultaneously. We additionally derive
theoretical properties of the mixing state index and present a family of
generalized mixing state indexes that vary in the importance assigned to
low-mass-fraction species. |
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