鹤山气溶胶光学性质和单颗粒化学组分的研究

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Abstract

The chemical composition and optical characteristics of single particle aerosols were observed using a single particle aerosol mass spectrometer (SPAMS), nephelometer and aethalometer at the Heshan Atmospheric Supersite in Guangdong from October to November in 2014. Single particles were classified into 9classes by Art-2a classification method including organic carbon-sulfate/nitrate particles (OC-Sulfate/Nitrate), elemental carbon-sulfate/nitrate particles (EC-Sulfate/Nitrate), elemental and organic carbon-sulfate/nitrate particles (ECOC-Sulfate/Nitrate), high molecular organic carbon particles (HOC), sea salt particles (Sea-salt), silicate particles (Si-rich), levoglucosan particles (Lev), potassium-sulfate/nitrate particles (K-Sulfate/Nitrate) and metal particles (Metal). The absorption coefficient, scattering coefficient and single scattering albedo (SSA) of the aerosols significantly increased from clean to haze periods. The aerosol extinction ability enhanced along with the percentage of EC-Sulfate/Nitrate particles decreased from 34.8% to 31%, and OC-Sulfate/Nitrate particles increased from 9.9% to 23.6% as well as K-Sulfate/Nitrate particles increased from 8.5% to 14%. Besides, the OC-Sulfate/Nitrate particles were internally mixing with sulfate, nitrate and ammonium in the haze period, suggesting the aged OC-Sulfate/Nitrate particles and K-Sulfate/Nitrate particles had a large contribution to the increase of aerosol extinction coefficient. The aerosol scattering coefficient and absorption coefficient enhanced as the increase of RH from 50% to above 70%, and the extinction coefficient increased from 326.1Mm^-1 to 362.9Mm^-1, while the SSA decreased. The PM_2.5 mass extinction efficiency increased from 4.98 to 5.99, and the percentage of EC-Sulfate/Nitrate and K-Sulfate/Nitrate particles decreased, while the proportion of OC-Sulfate/Nitrate particles increased from 7.79% to 14.29%, indicating the increase of aged OC-Sulfate/Nitrate particles mixing with sulfate, nitrate and ammonium salts has an important impact on the enhancement of the aerosol extinction coefficient under high RH conditions.

Key words： SPAMS haze single particle mixing state optical properties

Received: 12 November 2018

PACS:

X513

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	Articles by authors
	MA Qian-kun
	CHENG Chun-lei
	LI Mei
	CHEN Duo-hong
	ZHOU Yang
	WU Meng-xi
	ZHOU Zhen

Cite this article:

MA Qian-kun,CHENG Chun-lei,LI Mei等. The aerosol optical characteristics and chemical composition of single particles in Heshan[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(7): 2710-2720.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I7/2710

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