| 天津市2017年重污染过程二次无机化学污染特征分析 |
| 摘要点击 2311 全文点击 784 投稿时间：2018-10-24 修订日期：2018-12-24 |
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| 中文关键词 天津 重污染 2017年 二次转化 污染特征 |
| 英文关键词 Tianjin heavy pollution episode 2017 secondary inorganic pollution characteristics |
| 作者 | 单位 | E-mail | | 徐虹 | 天津市生态环境监测中心, 天津 300191 | xu01hong@163.com | | 肖致美 | 天津市生态环境监测中心, 天津 300191 | | | 陈魁 | 天津市生态环境监测中心, 天津 300191 | kuichen@126.com | | 李立伟 | 天津市生态环境监测中心, 天津 300191 | | | 杨宁 | 天津市生态环境监测中心, 天津 300191 | | | 高璟赟 | 天津市生态环境监测中心, 天津 300191 | | | 李源 | 天津市生态环境监测中心, 天津 300191 | | | 孔君 | 天津市生态环境监测中心, 天津 300191 | | | 毕温凯 | 天津市生态环境监测中心, 天津 300191 | | | 邓小文 | 天津市生态环境监测中心, 天津 300191 | dxwpp@163.com |
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| 中文摘要 |
| 基于2017年天津市超级观测站数据，筛选出7次典型重污染过程，从污染物浓度、二次转化方面分析重污染过程二次无机化学污染特征.结果表明，重污染期间NO3-和SO42-浓度较清洁天气增长幅度最高，显著高于PM2.5的增长程度，说明二次无机转化是导致重污染期间PM2.5污染加重的重要原因；下半年PM2.5和SO2污染程度较上半年减轻，与秋冬季采取燃煤治理等活动有关；重污染期间NO2/SO2比值为1.5~19.6，其中下半年NO2/SO2比值显著高于上半年，说明在各项污染源管控下移动源的影响比例相对增加；大部分重污染期间NO3-浓度大于SO42-浓度，SOR值高于NOR值，说明重污染期间硫酸盐和硝酸盐转化均较重要；在SO2浓度显著降低的情况下，重污染期间SO42-浓度并未明显降低，说明除二次无机转化外，硫酸盐生成还受其他因素影响. |
| 英文摘要 |
| Based on monitoring data collected at the supersite of Tianjin in 2017, seven typical heavy pollution episodes were investigated. The concentrations of air pollutants and secondary inorganic transformation products were analyzed to study the secondary inorganic pollution characteristics during the heavy pollution episodes. Compared to clean weather, concentrations of NO3- and SO42- during the heavy pollution episodes increased at rapid growth rates. These rates were obviously higher than the rate for PM2.5 increases, which indicates that the secondary inorganic reactions had an important influence on PM2.5 pollution during the episodes. The concentrations of PM2.5 and SO2 during the episodes in the latter half of the year were lower than those in the first half of the year probably because a substantial amount of coal use had been controlled. During the heavy pollution episodes, the NO2/SO2 values were 1.5 to 19.6, with higher values in the latter half of the year than the first half of the year suggestive of a greater influence from mobile sources. During most episodes, NO3- concentrations were higher than SO42- concentrations, and SOR values were higher than NOR values, which shows that the secondary transformation of nitrate and sulfate both played important roles during the heavy pollution episodes. When SO2 concentrations decreased significantly, SO42- concentrations did not decrease obviously, thus indicating that besides the secondary inorganic reactions, other factors also had a large impact on the generation of sulfate. |
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