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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
The size-resolved light absorption contribution of water soluble organic carbon in the atmosphere of Guangzhou

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郭子雍 1,2   阳宇翔 1,2   彭龙 1,2   廉秀峰 1,2   傅玉珍 1,2   张国华 1,3   毕新慧 1,3   王新明 1,3  
文摘 对广州地区春季(2015年3~4月)、夏季(2015年6~7月)、秋季(2015年9~10月)、冬季(2015年12月~2016年1月)四个季节6个粒径段(<0.49、 0.49~0.95、0.95~1.5、1.5~3.0、3.0~7.2以及7.2~10.0μm)的大气颗粒物样品中水溶性有机碳(WSOC)的浓度和光学性质等变化特征进行了研究.结果表明,WSOC的浓度水平呈现冬季[(5.07±2.80)μg/m~3]>秋季[(3.87±1.51)μg/m~3]>春季[(3.60±1.16)μg/m~3]>夏季[(2.42±0.51)μg/m~3]的季节变化特征;WSOC的质量平均直径(MMD)为0.57μm(春)、0.42μm(夏)、0.49μm(秋)和0.56μm(冬).WSOC的质量吸收效率MAE365差异较大,分布在0.18~1.42m~2/g之间,冬季最高;吸收波长指数AAE值分布在3.6~9.8之间.细颗粒物(<3μm)中WSOC对PM10WSOC总吸光的贡献达到了90%以上,其中<0.49μm颗粒物的贡献超过50%.在300~500nm之间,春季、夏季、秋季和冬季WSOC对颗粒物总吸光比例平均值分别为5.23%、2.95%、3.04%和6.92%;其中<0.49μm粒径段的贡献最高,分别为3.11%、1.79%、1.65%和3.45%.进一步通过特征紫外吸光度SUVA值的分析表明芳香性和分子量可能是影响WSOC吸光能力的重要因素.粒径越小颗粒物含有越多的不饱和键,使得MAE365值较高.
其他语种文摘 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/m~3] > autumn [(3.87±1.51)μg/m~3]> spring [(3.60±1.16)μg/m~3] > summer [(2.42±0.51)μg/m~3], 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 0.18~1.42m~2/g, with the highest value observed in winter, and the Absorption Angstr m 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.
来源 中国环境科学 ,2021,41(2):497-504 【核心库】
关键词 气溶胶 ; 水溶性有机碳(WSOC) ; 光学性质 ; 粒径分布
地址

1. 中国科学院广州地球化学研究所, 有机地球化学国家重点实验室;;广东省环境资源利用与保护重点实验室, 广东, 广州, 510640  

2. 中国科学院大学, 北京, 100049  

3. 中国科学院广州地球化学研究所,粤港澳环境污染过程与控制联合实验室, 广东, 广州, 510640

语种 中文
文献类型 研究性论文
ISSN 1000-6923
学科 环境污染及其防治
基金 国家自然科学基金资助项目 ;  广东省科技计划项目
文献收藏号 CSCD:6898849

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引证文献 2 篇

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