气溶胶粒径吸湿增长与散射吸湿增长的关系

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Abstract By utilizing the ground-based monitored data at an hourly time step recorded by AURORA-3000 integrating nephelometer, AE-31 aethalometer and GRIMM180 environment particle monitor from October to December 2017 in Chengdu, as well as the coincidental environmental and meteorological data (including atmospheric visibility, relative humidity (RH) and NO₂ mass concentration, respectively), researches in this paper were summarized as follows. Firstly, aerosols particle size hygroscopic growth factor Gf(RH) was retrieved by combining immune evolution algorithm with Mie scattering theory algorithm. Secondly, aerosols scattering hygroscopic growth factor f(RH) was measured with the aid of optical synthetic approach, and then, the relationship between Gf(RH) and f(RH) was further investigated. The results showed that both Gf(RH) and f(RH) grew mildly at RH<85%, while for RH>85%, the pattern changed to explosive growth. Sigmoid function f(RH)=17.34/(1+e^{-2.43·[Gf(RH)-2.15}]) could well fit the variation of f(RH) with Gf(RH), and the determining coefficient (R²) and the mean relative error (MRE) between the fitted f(RH) and the measured values are 0.97and 4.01%, respectively. Subsequently, the aerosols scattering coefficient[b_sp(RH)] and absorption coefficient[b_ap] during an evolution of haze were further simulated with Gf(RH) calculated by the sigmoid function, and the simulated values were in good agree with the measured values. The corresponding R²are respectively 0.99and 0.98, and the corresponding MRE are respectively 2.94% and 5.24%.

Key words： aerosol particle size scattering extinction hygroscopic growth sigmoid function

Received: 16 April 2020

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X513

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	Articles by authors
	ZHANG Zhi-cha
	NI Chang-jian
	ZHANG Cheng-yu
	YANG Yin-shan
	DENG Ye

Cite this article:

ZHANG Zhi-cha,NI Chang-jian,ZHANG Cheng-yu等. Relationship between particle size hygroscopic growth and scattering hygroscopic growth[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(12): 5198-5204.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I12/5198

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