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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:

2025年第04期

Page:

844-856

Research Field:

黄河流域生态保护和高质量发展专刊(下)

Publishing date:

Info

Title:

Characteristics of Aerosol Pollution and Particle Size Distribution Evolution During a Dust Storm Process in 2024 in Xi’an Area of Shaanxi, China

Author(s):

ZHONG Jia-hao; WANG Si-yu; WANG Yan; ZHANG Li-yuan^*

(School of Water and Environment, Chang’an University, Xi’an 710064, Shaanxi, China)

Keywords:

dust storm;  atmospheric particulate matter;  pollutant;  particle size distribution;  inorganic component analysis;  PMF source apportionment;  aerosol;  Shaanxi

PACS:

X513

DOI:

10.19814/j.jese.2025.02035

Abstract:

To investigate the characteristics of aerosol pollution and particle size distribution evolution during a dust storm process in Xi’an area of Shaanxi from March 15th to 17th, 2024, an optical particle sizer and an online environmental ion monitor were employed to observe the dynamic changes in particle size distribution and ion composition of atmosphere; combined with atmospheric pollutant data and meteorological data, the characteristics of particulate matter pollution and particle size distribution evolution during the dust storm process were studied. The results show that the dust storm process is divided into four periods, including clean background period, the first period of the dust storm process(dust period Ⅰ), the secondary period of the dust storm process(dust period Ⅱ), and dust dissipation period; significant differences are observed in aerosol sources, particle size distribution, and ion composition across these periods; compared with the clean background period, the particle mass concentration do not show a significant increase during dust period Ⅰ, but the particle number concentration with sizes 0.300 μm to 0.576 μm ranging from increases rapidly; the ionic composition is dominated by NH⁺₄ and secondary pollutants such as NO^-₃ and SO^2-₄; in dust period Ⅱ, the coarse particles with sizes larger than 2.5 μm become dominant; the particle number concentration decreases, while the mass concentrations of Ca²⁺, Mg²⁺, and Na⁺ increase several times; compared with clean background period, dust period Ⅰ is dominated by smaller particles, causing the particle size spectrum to shift upward; compared with dust period Ⅰ, dust period Ⅱ is dominated by larger particles, resulting in a rightward shift of peak particle size. Backward trajectory analysis and PMF source apportionment results indicate that particle pollution during dust period Ⅰ is mainly attributed to anthropogenic pollution sources from satellite towns and suburbs around Xi’an city, while dust period Ⅱ exhibits clear characteristics of dust sources.

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Last Update: 2025-07-25