南京北郊冬夏季节大气碳质气溶胶的污染特征

论文总字数：24633字

目 录

1 引言……………………………………………………………………5

• 1. 研究背景及意义…………………………………………………………………………5
  2. 碳质气溶胶的化学组成和来源…………………………………………………………5
     1. 碳质气溶胶的化学组成…………………………………………………………5
     2. 碳质气溶胶的来源………………………………………………………………6
  3. 碳质气溶胶的污染特征…………………………………………………………………6

1.3.1 碳质气溶胶的物理光学特性……………………………………………………6

1.3.2 碳质气溶胶的化学特性…………………………………………………………7

• 1. 国内外研究现状…………………………………………………………………………7
  2. 研究内容及目标…………………………………………………………………………8

2 材料和方法……………………………………………………………8

2.1样品采集…………………………………………………………………………………8

2.2样品分析及处理…………………………………………………………………………9

2.3质量控制…………………………………………………………………………………9

3 数据分析及讨论………………………………………………………9

3.1 PM_2.5的质量浓度分析……………………………………………………………………9

3.2 OC、EC的质量浓度分析…………………………………………………………………10

3.3 OC、EC的相关性分析……………………………………………………………………11

3.4 WSOC、SOC和OC的关系分析…………………………………………………………13

3.4.1 二次有机碳（SOC）的估算………………………………………………………13

3.4.2 WSOC、SOC和OC的相关分析…………………………………………………14

3.5 后向轨迹模型分析………………………………………………………………………17

3.6碳质气溶胶和气象因子的关系分析……………………………………………………17

4 结论……………………………………………………………………19

参考文献…………………………………………………………………19

南京北郊冬夏季大气碳质气溶胶的污染特征

孙雨情

,China

Abstract：With the continuous development of economic and urbanization, atmospheric haze events frequently happen in the world and receive extensive attention. In this paper, Northern suburb of Nanjing was used as a research site to determine the carbon composition in the PM_2.5 samples of the Northern Suburbs of Nanjing in the summer and winter in 2016 using the organic carbon and element carbon analyzer and TOC analyzer. Concentration levels and variations of carbon components in PM_2.5 and the transport processes of PM_2.5 were determined using the HYSPLIT receptor model. The results showed that heavy atmospheric pollution was found and the average daily PM_2.5 concentration in the northern suburbs of Nanjing were (54.2±13.7) μg/m³ and (103.7±33.3) μg/m³, respectively. Carbonaceous aerosols were key factors that cause pollution. The main sources of carbonaceous aerosols were vehicle emissions and fuel combustions. Correlation analysis showed that OC and EC have similar sources in summer. The daily average of WSOC accounted for 53.1% and 47.8% of the total OC, respectively in summer and winter. WSOC was mainly from primary sources in summer and secondary sources in autumn and winter. The strong correlation between WSOC and SOC (R²=0.66) indicated that most SOC were also water soluble. The backward trajectory model showed that clean air masses transported from the east ocean reduced the atmospheric particulate matter pollution in summer. In addition, MODIS fire spots showed that biomass combustion had a great influence on the concentrations of carbonaceous aerosols in the northern suburb of Nanjing in summer. Heavily polluted air mass transported from cities in North China caused higher concentrations of carbonaceous aerosols in winter.

Key words: Organic carbon；Elemental carbon；Nanjing；Water-solubled organic carbon

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