Quantifying aerosol mixing state with entropy and diversity measures

doi:10.5194/acp-13-11423-2013

GSTDTAP > 地球科学

DOI	10.5194/acp-13-11423-2013
	Quantifying aerosol mixing state with entropy and diversity measures
	N. Riemer and M. West
	2013-11-25
发表期刊	Atmospheric Chemistry and Physics
出版年	2013
英文摘要	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 D_α and the bulk population species diversity D_γ, 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.
领域	地球科学
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/288014
专题	地球科学
推荐引用方式 GB/T 7714	N. Riemer and M. West. Quantifying aerosol mixing state with entropy and diversity measures[J]. Atmospheric Chemistry and Physics,2013.
APA	N. Riemer and M. West.(2013).Quantifying aerosol mixing state with entropy and diversity measures.Atmospheric Chemistry and Physics.
MLA	N. Riemer and M. West."Quantifying aerosol mixing state with entropy and diversity measures".Atmospheric Chemistry and Physics (2013).