| 摘要: |
| 于2020年12月1日—2021年11月30日利用7波段黑碳仪（AE-31）观测苏州地区黑碳（BC）浓度变化特征，并使用黑碳仪模型和后向轨迹模型分析BC排放来源和潜在源区。结果发现，苏州地区BC年平均质量浓度为（1.29±0.64）μg/m3，冬季BC质量浓度最高，为（1.61±0.89）μg/m3，秋季为（1.34±0.61）μg/m3，春季为（1.23±0.48）μg/m3，夏季最低，为（1.03±0.43）μg/m3。各季节工作日、非工作日BC质量浓度日变化均呈早晚双峰分布规律。BC质量浓度与风速、气温、降水量呈负相关，与相对湿度相关性并不显著。黑碳来源解析结果表明，相比于固体燃料（如煤和生物质燃烧），液体燃料（如交通排放）对苏州BC质量浓度的贡献在各季节均占主要地位（74.2%～76.3%），且夏季最高，冬季最低。同时，后向轨迹模拟和浓度轨迹权重分析的潜在源区结果显示，与本地污染相比，影响苏州地区BC的更多为输送型气团；各季节BC的潜在源区也稍有差异，主要以西南方向的影响为主。 |
| 关键词: 黑碳气溶胶 浓度特征 源解析 后向轨迹 |
| DOI：DOI：10.3969/j.issn.1674-6732.2024.02.003 |
| 分类号:X513 |
| 基金项目:苏州市气象局科研项目(szkj202004) |
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| Concentration Characteristics and Sources of Suzhou Black Carbon Aerosols in 2021 |
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ZENG Chen1， WU Yue1， ZHU Jun2， LI Ji3，4*
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1. Suzhou Meteorology Bureau， Suzhou， Jinagsu 215131， China；2.Taizhou Environmental Monitoring Center of Jiangsu Province， Taizhou， Jiangsu 225300， China； 3. Key Laboratory for Meteorological Disaster Prevention and Mitigation of Shandong， Jinan， Shandong 250031， China；4. Shandong Meteorological Engineering Technology Center， Jinan， Shandong 250031， China
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| Abstract: |
| Black carbon（BC） was measured in Suzhou from December 1， 2020 to November 30， 2021， using a seven channel aethalometer（AE-31）. The variation characteristics of BC were obtained. BC sources were explored based on the aethalometer model， a hybrid single particle Lagrangian integrated trajectory model（HYSPLIT） and concentration weighted trajectory（CWT）. The results showed the annual average concentration of BC was 1.29 μg/m3 with a standard deviation of 0.64 μg/m3， the BC concentration was the highest in the winter［（1.61±0.89）μg/m3］， followed by the autumn［（1.34±0.61）μg·m3］， spring［（1.23±0.48）μg/m3］， and was the lowest in summer［（1.03±0.43）μg/m3］. The daily variation of BC concentration on weekdays and holidays in each season showed a bimodal structure in the morning and evening. Besides， BC concentration was negatively correlated with wind speed， air temperature and precipitation， but not with relative humidity. The source apportionment of BC showed that compared with the solid fuel（e.g.，coal and biomass combustion）， the liquid fuel（e.g.，vehicle emission） had higher contribution to total BC concentration during all seasons（74.2%～76.3%）. The contribution of liquid fuel to the total BC was higher in summer， while solid fuel had a higher contribution in winter. The results of hybrid single particle Lagrangian integrated trajectory（HYSPLIT） and concentration weighted trajectory（CWT） showed that the potential sources of BC in Suzhou were slightly different in different seasons and were affected by the different air mass sources. However， the main potential source regions were from the southwest part. |
| Key words: Black carbon（BC） aerosol Characteristics of concentration Source apportionment Backward trajectory |
