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Tianjinheavy pollution episode2017secondary inorganicpollution 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

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SO₄^2-浓度较清洁天气增长幅度最高，显著高于PM_2.5的增长程度，说明二次无机转化是导致重污染期间PM_2.5污染加重的重要原因；下半年PM_2.5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SO₄^2-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SO₄^2-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 SO₄^2- during the heavy pollution episodes increased at rapid growth rates. These rates were obviously higher than the rate for PM_2.5 increases, which indicates that the secondary inorganic reactions had an important influence on PM_2.5 pollution during the episodes. The concentrations of PM_2.5 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 SO₄^2- 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, SO₄^2- 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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