| 南京冬季重污染过程中黑碳气溶胶的混合态及粒径分布 |
| 摘要点击 2669 全文点击 962 投稿时间：2016-05-16 修订日期：2016-08-06 |
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| 中文关键词 黑碳 南京 单颗粒黑碳光度计(SP2) 混合态 粒径分布 |
| 英文关键词 black carbon Nanjing single particle soot photometer (SP2) mixing state size distribution |
| 作者 | 单位 | E-mail | | 蒋磊 | 南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044 | jianglei1836209@163.com | | 汤莉莉 | 南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044
江苏省环境监测中心, 南京 210036 | lily3258@163.com | | 潘良宝 | 南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044
江苏省环境监测中心, 南京 210036 | | | 刘丹彤 | Centre for Atmospheric Science, School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester M139PL, UK | | | 花艳 | 南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044 | | | 张运江 | 南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044 | | | 周宏仓 | 南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044 | | | 崔玉航 | 南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044 | |
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| 中文摘要 |
| 2013年12月，我国中东部地区暴发持续性重污染过程.本研究利用单颗粒黑碳光度计（SP2），分析这次过程中黑碳气溶胶（BC）的质量浓度、混合态以及粒径分布特征.结果表明，观测期间南京BC质量浓度在1.01~14.05 μg·m-3之间，平均为4.39 μg·m-3，污染较重时呈现夜间高白天低的日变化特征，污染较轻时则为早晚双峰型；用相对包裹层厚度（Dp/Dc）表示BC混合态特征，污染较轻时日变化为凌晨及午后较高，早晚出行高峰期较低，说明在凌晨及午后BC的老化程度较深，早晚机动车排放高峰时段BC多为近地源排放的新鲜粒子.污染较重时Dp/Dc日变化相对平缓，区域性污染特征更为明显并在高相对湿度下体现出气-固转化的过程；BC质量和数谱的粒径分布均为单峰型，数谱峰值粒径在污染较轻时分布在91 nm左右，污染较重时为100 nm，不同污染程度下质量谱峰值粒径均为210 nm，通过对比全球范围的观测结果可以体现出BC一次源的区域性差异.本研究对深入认识长三角地区大气BC污染特征，具有重要的参考价值. |
| 英文摘要 |
| In December 2013,a lasting haze pollution event occurred in the Central and East regions of China.Here in this paper,using a single-particle soot photometer (SP2),we studied mass concentrations,mixing states,and size distributions of black carbon (BC) in this event.The results showed that BC mass concentration in Nanjing during the observation period was in the range of 1.01-14.05 μg·m-3 with an average of 4.39 μg·m-3,showing the characteristics of double peaks for lighter pollution,andhigh in the nighttime and low in the daytime during heavier pollution.Using the relative coating thickness (Dp/Dc) to define mixing state of black carbon,diurnal variations were higher in early morning and noon when slightly polluted,and lower during rush hour,indicating the degree of BC ageing was deeper in the morning and afternoon,with fresher particles near the ground source emissions during rush hour.The relative coating thickness did not vary greatly throughout the day when heavily polluted,which was expected to be linked to regional pollutants and it also showed Gas-solid transformation under high relative humidity.The average mass and number size distribution had single peaking with the same BC volume-equivalent diameter in different degrees of pollution,with the peak diameter at 100 nm for the number distribution when heavily polluted,at 91 nm when slightly polluted,and at 210 nm for the mass distribution regardless of the degree of pollution.We could find regional differences of BC sources by comparing the observed research worldwide.This study has very important reference value for the in-depth understanding of BC pollution in Yangtze River Delta. |
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