College of Atmospheric Sciences, Chengdu University of Information Technology, Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu, China; CAS Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China.
South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou, China.
Sci Total Environ. 2017 Jun 1;587-588:240-247. doi: 10.1016/j.scitotenv.2017.02.127. Epub 2017 Feb 24.
To evaluate the impact of fine particulate matter (PM) size distribution on aerosol chemical and optical properties, dominant chemical components including water-soluble inorganic ions (WSII), organic carbon (OC) and elemental carbon (EC) in PM and PM, aerosol scattering coefficient (b), and aerosol absorption coefficient (b) were collected synchronously at an urban site in Guangzhou, south China during a typical summer month in 2009 and a winter month in 2010. PM (sizes smaller than 1μm) constituted 77% and 63% of PM in summer and winter, respectively. From the reconstructed mass concentrations, the sum of SO, NO and NH (SNA) distributed more in PM than in PM (PM minus PM) in summer and the opposite was found in winter, while carbonaceous aerosols distributed more in PM in both summer and winter. With the aggravation of PM pollution, the mass fraction of PM/PM increased for (NH)SO (AS), NHNO (AN) and EC but decreased for organic matter (OM) in summer, and the opposite was found in winter. B of PM and PM was estimated from the mass extinction efficiencies (MSEs) of the dominant chemical components, which showed good correlations (R=0.99) with measured ones and those estimated using the IMPROVE formula. The fractional contributions of dominant chemical components to extinction coefficient (b) were consistent with their respective mass size distributions, indicating the importance of chemically-resolved aerosol size distributions on aerosol optical properties and haze formation.
为了评估细颗粒物（PM）粒径分布对气溶胶化学和光学性质的影响，我们在 2009 年夏季和 2010 年冬季的典型月份，在中国南方广州市的一个城区同步采集了 PM 及其子粒径段 PM 中主要化学成分（包括水溶性无机离子（WSII）、有机碳（OC）和元素碳（EC））、气溶胶散射系数（b）和吸收系数（b）。夏季 PM 的粒径小于 1μm 的部分占 PM 的 77%，冬季占 63%。从重构的质量浓度来看，夏季 SO、NO 和 NH 的总和（SNA）在 PM 中分布较多，而在 PM 中分布较少（PM 减去 PM），冬季则相反，而在夏冬两季碳质气溶胶在 PM 中分布较多。随着 PM 污染的加剧，夏季 PM/PM 的质量分数增加了（NH）SO（AS）、NHNO（AN）和 EC，但有机物质（OM）的质量分数减少，而冬季则相反。PM 和 PM 的 b 值是根据主要化学成分的质量消光效率（MSE）估算的，与实测值和 IMPROVE 公式估算值具有很好的相关性（R=0.99）。主要化学成分对消光系数（b）的贡献份额与其各自的质量粒径分布一致，这表明对气溶胶化学特性的解析粒径分布对气溶胶光学性质和霾的形成具有重要意义。
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