Evolution in physiochemical and cloud condensation nuclei activation properties of crop residue burning particles during photochemical aging

论文摘要

As a main form of biomass burning in agricultural countries, crop residue burning is a significant source of atmospheric fine particles. In this study, the aging of particles emitted from the burning of four major crop residues in China was investigated in a smog chamber.The particle size distribution, chemical composition and cloud condensation nuclei(CCN)activity were simultaneously measured. The properties of crop residue burning particles varied substantially among different fuel types. During aging, the particle size and mass concentration increased substantially, suggesting condensational growth by formation of secondary aerosols. The particle composition was dominated by organics. Aging resulted in considerable enhancement of organics and inorganics, with enhancement ratios of 1.24–1.44 and 1.33–1.76 respectively, as well as a continuous increase in the oxidation level of organics. Elevated CCN activity was observed during aging, with the hygroscopicity parameter κ varying from 0.16 to 0.34 for fresh particles and 0.19 to 0.40 for aged particles.Based on the volume mixing rule, the hygroscopicity parameter of organic components(κorg) was derived. κorgexhibited an increasing tendency with aging, which was generally consistent with the tendency of the O:C ratio, indicating that the oxidation level was related to the hygroscopicity and CCN activity of organic aerosols from crop residue burning. Our results indicated that photochemical aging could significantly impact the CCN activation of crop burning aerosols, not only by the production of secondary aerosols, but also by enhancing the hygroscopicity of organic components, thereby contributing to the aerosol indirect climate forcing.

论文目录

• Introduction
• 1. Materials and methods
•   1.1. Types of crop residues, combustion stove and experimental procedure
•   1.2. Particle number concentration, size distribution and CCN activity measurement
•   1.3. Particle chemical composition
• 2. Results and discussion
•   2.1. Evolution of particle number size distribution
•   2.2. Chemical composition evolution
•   2.3. CCN activity
• 3. Conclusions
• Appendix A.Supplementary data

文章来源

类型: 期刊论文

作者: Yan Ma,Chao Chen,Junfeng Wang,Youling Jiang,Zewen Zheng,Hui Chen,Jun Zheng

来源: Journal of Environmental Sciences 2019年03期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 环境科学与资源利用

单位: Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science and Technology,Harvard-NUIST Joint Laboratory for Air Quality and Climate (JLAQC), Nanjing University of Information Science and Technology,NUIST Reading Academy, Nanjing University of Information Science and Technology

基金: supported by the National Key Research and Development Project(No.2016YFC0202402),the National Natural Science Foundation of China(Nos.41575122 and 41675126),the Priority Academic Program Development of Jiangsu Higher Education Institutions

分类号: X513

页码: 43-53

总页数: 11

文件大小: 1355K

下载量: 32