广州地区不同粒径段大气颗粒物中水溶性有机碳的吸光贡献

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Abstract The concentrations and optical properties of water-soluble organic carbon (WSOC) in the size-resolved aerosols of Guangzhou collected during spring (Mar. to Apr. 2015), summer (Jun. to Jul. 2015), autumn (Sept. to Oct. 2015), and winter (Dec. 2015 to Jan. 2016) were investigated. The results showed that the concentration levels of WSOC were in the order of winter[(5.07±2.80)μg/m³] > autumn[(3.87±1.51)μg/m³]> spring[(3.60±1.16)μg/m³] > summer[(2.42±0.51)μg/m³], and the mass mean diameter of WSOC in each season was 0.57μm (spring), 0.42μm (summer), 0.49μm (autumn), and 0.56μm (winter), respectively. The MAE₃₆₅ of WSOC varied in a wide range of 0.18~1.42m²/g, with the highest value observed in winter, and the Absorption Ångstrӧm Exponent (AAE) varied in a wide range of 3.6~9.8. The light absorption of WSOC in fine particles (<3μm) contributed more than 90% to the total absorption of PM₁₀, and more than 50% was attributed to WSOC in the <0.49μm particles. Over the wavelength of 300~500nm, the average proportion of WSOC light absorption to total aerosol absorption in spring, summer, autumn, and winter was 5.23%, 2.95%, 3.04%, and 6.92%, respectively, and the <0.49μm particles represented the highest contribution, which was 3.11%, 1.79%, 1.65%, and 3.45%, respectively. Further analysis of the specific UV Absorbance (SUVA) indicated that the aromatic content and molecular weight of WSOC might be important components affecting their light-absorbing efficiencies. The higher MAE₃₆₅ values observed in the finer particles are associated with more unsaturated bonds.

Key words： aerosol water-soluble organic carbon (WSOC) light absorption size distribution

Received: 12 June 2020

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X513

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	GUO Zi-yong
	YANG Yu-xiang
	PENG Long
	LIAN Xiu-feng
	FU Yu-zhen
	ZHANG Guo-hua
	BI Xin-hui
	WANG Xin-ming

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GUO Zi-yong,YANG Yu-xiang,PENG Long等. The size-resolved light absorption contribution of water soluble organic carbon in the atmosphere of Guangzhou[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 497-504.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I2/497

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