The size-resolved light absorption contribution of water soluble organic carbon in the atmosphere of Guangzhou
GUO Zi-yong1,2, YANG Yu-xiang1,2, PENG Long1,2, LIAN Xiu-feng1,2, FU Yu-zhen1,2, ZHANG Guo-hua1,3, BI Xin-hui1,3, WANG Xin-ming1,3
1. Guangdong Key Laboratory of Environmental Protection and Resources Utilization, State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
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.
郭子雍, 阳宇翔, 彭龙, 廉秀峰, 傅玉珍, 张国华, 毕新慧, 王新明. 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[J]. 中国环境科学, 2021, 41(2): 497-504.
GUO Zi-yong, YANG Yu-xiang, PENG Long, LIAN Xiu-feng, FU Yu-zhen, ZHANG Guo-hua, BI Xin-hui, WANG Xin-ming. The size-resolved light absorption contribution of water soluble organic carbon in the atmosphere of Guangzhou. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 497-504.
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