霾过程黑碳对气溶胶散射吸湿增长的影响

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Abstract Based on the hourly observed “dry” aerosol scattering coefficient, aerosol absorption coefficient, and the environmental meteorological monitoring data, and the retrieved aerosol particle size hygroscopic growth factor (Gf) from October to December 2017 in Chengdu, the statistical characteristics of black carbon concentration (C_BC) were analyzed under four kinds of haze intensity conditions. Besides, the influence mechanism for C_BC on the aerosol scattering hygroscopic growth was investigated using the aid of Generalized Additive Model (GAM). The results show that: (1) C_BC obeyed lognormal distribution under slight, mild, moderate, and severe haze conditions. The averaged value of C_BC increased but the variation coefficient of C_BC decreased with increasing haze intensity. (2) C_BC showed nonlinear negative correlations with Gf, and nonlinear positive correlations with C_{PM_2.5/PM10} (mass concentration ratio between fine particulate matter and coarse particulate matter) (passing the α=0.01 significant test). Haze development intensified the downward trend of Gf with C_BC and reduced the upward trend of C_{PM_2.5/PM10} with C_BC. (3) There were significant interactions between C_{PM_2.5/PM10}and Gf (passing the α=0.001 significant test). The bivariate GAM model with Gf and C_{PM_2.5/PM10} could better characterize the variation on f.

Key words： aerosol scattering hygroscopic growth factor black carbon haze processes GAM

Received: 15 February 2024

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X513

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	TONG Jing-zhe
	MI Jia-yuan
	TU Chao-yong
	LI Na
	LI Zong-hao
	DENG Ye
	NI Chang-jian

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TONG Jing-zhe,MI Jia-yuan,TU Chao-yong等. Black carbon during haze processes impact on aerosol scattering hygroscopic growth[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(9): 4835-4843.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I9/4835

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