霾过程气溶胶吸湿参数变化的多因素影响分析

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Abstract Based on the hourly observational data from October to December 2017 in Chengdu, as well as the simultaneous data of atmospheric visibility (V), relative humidity (RH) and nitrogen dioxide (NO₂), aerosol hygroscopic growth factor (Gf) was retrieved by Mie scattering theory coupled with immune evolutionary algorithm, and then aerosol hygroscopic parameter κ was calculated by κ-köhler theory, the variation characteristics of aerosol hygroscopic parameter κ and its influencing factors were analyzed during the haze process. The results showed that: The aerosol hygroscopic parameters κ were 0.142±0.092、0.149±0.088、0.191±0.061and 0.200±0.041 under mild, light, moderate and heavy haze intensity conditions respectively. The set of explanatory variables of aerosol hygroscopicity parameter κ was determined, including C_BC, C_BC/C_PM_2.5, C_PM₁/C_PM_2.5 and C_PM_2.5/C_PM₁₀ (C_BC, C_PM₁, C_PM_2.5 and C_PM₁₀ represented mass concentrations of BC, PM₁, PM_2.5 and PM₁₀ respectively). There were significant differences in the explanatory power for aerosol hygroscopic parameter κ of each variable as the haze intensities changed. The multifactor GAM model could be well characterized aerosol hygroscopic parameter κ variation (passed the significance test of α=0.001). As to the above four haze conditions, the corresponding adjusted coefficients of determination (R²) were 0.303, 0.488, 0.504 and 0.631, the coefficients of determination (R²) for the regression of the pressure axis were 0.327, 0.517, 0.558 and 0.739, and the residual sum of squares (RSS) were 1.448, 0.721, 0.209, and 0.025, respectively. The above study revealed the complexity of the multifactorial influence on aerosol hygroscopic parameter κ, and further clarified the intrinsic connection between aerosol hygroscopicity and haze evolution.

Key words： aerosol hygroscopicity parameter haze intensities GAM model Chengdu

Received: 06 August 2024

PACS:

X513

Corresponding Authors: 邓也,高级工程师,7161653@qq.com E-mail: 7161653@qq.com

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	Articles by authors
	MI Jia-yuan
	DENG Ye
	LI Xin-yi
	TONG Jing-zhe
	LI Na
	NI Chang-jian

Cite this article:

MI Jia-yuan,DENG Ye,LI Xin-yi等. Multifactorial impact analysis of aerosol hygroscopic parameters during haze process[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(3): 1210-1217.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I3/1210

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