| 南京市夏季大气气溶胶新粒子生成事件分析 |
| 摘要点击 2821 全文点击 1628 修订日期：2011-07-13 |
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| 中文关键词 新粒子生成 大气气溶胶 数浓度 表面积浓度 后向轨迹 污染气体 南京 |
| 英文关键词 new particle formation aerosol number concentration surface area concentration back trajectory pollutant gas Nanjing |
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| 中文摘要 |
| 研究了南京市夏季大气气溶胶数浓度的基本特征和气溶胶新粒子生成事件的形成条件及其影响因子.应用宽范围颗粒粒径谱仪 (WPS)和双光路差分吸收光谱仪(DOAS)对南京市 2010年 7月大气气溶胶数浓度谱分布和污染气体(O3、SO2和 NO2)进行了观测,并结合气象要素观测数据和后向轨迹模式模拟,探讨了南京市夏季大气气溶胶新粒子生成的条件及其影响因子.结果表明,南京市夏季 10~500nm气溶胶平均数浓度为 1.7×104 cm-3,与北美和欧洲的一些典型城市观测值相近; 10~25 nm气溶胶粒子数浓度占总数浓度的比例为 25%.观测期间共出现6次新粒子生成事件,通过分析发现比较稳定的风速风向、较强的太阳辐射有利于南京夏季新粒子的形成.南京夏季新粒子生成事件的相对湿度条件在 50%~70%,通过后向轨迹模式模拟的结果发现偏东风或偏南风带来的海洋性洁净气团有利于新粒子的生成.南京夏季新粒子生成事件发生时, 10~25 nm气溶胶数浓度与 SO2的浓度呈正相关,与 O3的浓度呈负相关,而与 NO2的浓度相关性较差. |
| 英文摘要 |
| Feature of aerosol particle number concentration, condition and impact factor of new particle formation (NPF) were investigated in Nanjing during summer. In this study, aerosol particle number concentration and gaseous pollutants (O3, SO2 and NO2) measurements were carried out by Wide-Range Particle Spectrometer (WPS) and Differential Optical Absorption Spectroscopy (DOAS) in July 2010. Combining with observations from Automatic Weather Station and Backward Trajectory Simulation, the condition and impact factor of NPF were discussed. Results showed that the averaged 10-500 nm particle number concentration was 1.7×104 cm-3, similar to some typical observation values in North American and Europe; the 10-25 nm particle number concentration accounted for 25% of the total number concentration. Six NPF events occurred during observation. We analyzed that stable wind speed and direction, strong solar radiation promoted the NPF. The humidity during NPF event varied from 50% to 70%. Results indicated that clean ocean air mass brought from easterly and southerly wind promoted the NPF by Backward Trajectory Model Simulation. During the NPF event, the 10-25 nm particle number concentration positively correlated with the concentration of SO2, and negatively correlated with O3, whereas poorly correlated with NO2. |
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