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DOI	10.5194/acp-23-3195-2023
	Quantifying particle-to-particle heterogeneity in aerosol hygroscopicity
	Yuan, Liang; Zhao, Chunsheng
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	3195
结束页码	3205
卷号	23 期号:5 页码:11
英文摘要	The particle-to-particle heterogeneity in aerosol hygroscopicity is crucial for understanding aerosol climatic and environmental effects. The hygroscopic parameter kappa, widely applied to describe the hygroscopicity for aerosols both in models and observations, is a probability distribution highly related to aerosol heterogeneity due to the complex sources and aging processes. However, the heterogeneity in aerosol hygroscopicity is not adequately represented in observations and model simulations, leading to challenges in accurately estimating aerosol climatic and environmental effects. Here, we propose an algorithm for quantifying the particle-to-particle heterogeneity in aerosol hygroscopicity, based on information-theoretic entropy measures, by using the data that come only from the in situ measurement of the hygroscopicity tandem differential mobility analyzer (H-TDMA). Aerosols in this algorithm are assumed to be simple binary systems consisting of the less hygroscopic and more hygroscopic components, which are commonly used in H-TDMA measurement. Three indices, including the average per-particle species diversity D-alpha, the bulk population species diversity D-gamma, and their affine ratio chi are calculated from the probability distribution of kappa to describe aerosol heterogeneity. This algorithm can efficiently characterize the evolution of aerosol heterogeneity with time in the real atmosphere. Our results show that the heterogeneity varies much with aerosol particle size, and large discrepancies exist in the width and peak value of particle number size distribution (PNSD) with varied heterogeneity after hygroscopic growth, especially for conditions with high relative humidity. This reveals a vital role of the heterogeneity in ambient PNSD and significant uncertainties in calculating the climate-relevant properties if the population-averaged hygroscopicity is applied by neglecting its heterogeneity. This work points the way toward a better understanding of the role of hygroscopicity in evaluating aerosol climatic and environmental impacts.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000946591100001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273442
作者单位	Chengdu University of Information Technology; Peking University
推荐引用方式 GB/T 7714	Yuan, Liang,Zhao, Chunsheng. Quantifying particle-to-particle heterogeneity in aerosol hygroscopicity[J],2023,23(5):11.
APA	Yuan, Liang,&Zhao, Chunsheng.(2023).Quantifying particle-to-particle heterogeneity in aerosol hygroscopicity.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(5),11.
MLA	Yuan, Liang,et al."Quantifying particle-to-particle heterogeneity in aerosol hygroscopicity".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.5(2023):11.