气候变化领域集成服务门户(CCPortal): Direct links between hygroscopicity and mixing state of ambient aerosols: Estimating particle hygroscopicity from their single-particle mass spectra

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DOI	10.5194/acp-20-6273-2020
	Direct links between hygroscopicity and mixing state of ambient aerosols: Estimating particle hygroscopicity from their single-particle mass spectra
	Wang X.; Ye X.; Chen J.; Wang X.; Yang X.; Fu T.-M.; Zhu L.; Liu C.
发表日期	2020
ISSN	16807316
起始页码	6273
结束页码	6290
卷号	20 期号:11
英文摘要	Hygroscopicity plays crucial roles in determining aerosol optical properties and aging processes in the atmosphere. We investigated submicron aerosol hygroscopicity and composition by connecting an aerosol time-of-flight mass spectrometer (ATOFMS) in series to a hygroscopic tandem differential mobility analyzer (HTDMA), to characterize hygroscopicity and composition of ambient aerosols in Shanghai, China. The HTDMA-ATOFMS data suggested that particle types, including biomass burning, elemental carbon (EC), dust/ash, organic particles, cooking particles and sea salt, were shown to have distinct hygroscopicity distributions. Peak intensities in particle spectra were found to be nonlinearly correlated with hygroscopicity, and the correlations were variant with particle types. Based on the measured hygroscopicity-composition relations, we developed a statistical method to estimate ambient particle hygroscopicity just from their mass spectra. The method was applied to another ambient ATOFMS dataset sampled from 12 to 28 September 2012 in Shanghai. The estimated hygroscopicity suggested that ambient particles were present in three apparent hygroscopicity modes, whose growth factors peaked at 1.05, 1.42 and 1.60 (85 % relative humidity, RH). The estimated growth factor (GF) were divided into four bins as <1.1, 1.1-1.3, 1.3-1.5 and >1.5 to represent the nearly hydrophobic (NH), less-hygroscopic (LH), more-hygroscopic (MH) and sea salt (SS) modes. Number contributions of particle types to hygroscopicity modes showed consistent results with the HTDMA-ATOFMS experiment. Based on the combined information on particle composition, hygroscopicity, air mass back trajectories and ambient pollutant concentrations, we inferred that the NH, LH, MH and SS modes were characterized by primary organic aerosol (POA) ĝˆ• EC, secondary organic aerosol (SOA), secondary inorganic aerosol (SIA) and salt compositions, respectively. The proposed method would provide additional information to the study of particle mixing states, source identification and visibility variation. © 2020 Copernicus GmbH. All rights reserved.
关键词	aerosol aerosol composition ambient air biomass burning elemental carbon hygroscopicity mass spectrometry particulate organic matter China Shanghai
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132004
推荐引用方式 GB/T 7714	Wang X.,Ye X.,Chen J.,et al. Direct links between hygroscopicity and mixing state of ambient aerosols: Estimating particle hygroscopicity from their single-particle mass spectra[J]. Atmospheric Chemistry and Physics,2020,20(11).
APA	Wang X..,Ye X..,Chen J..,Wang X..,Yang X..,...&Liu C..(2020).Direct links between hygroscopicity and mixing state of ambient aerosols: Estimating particle hygroscopicity from their single-particle mass spectra.,20(11).
MLA	Wang X.,et al."Direct links between hygroscopicity and mixing state of ambient aerosols: Estimating particle hygroscopicity from their single-particle mass spectra".20.11(2020).