天津市冬季典型大气重污染过程特征

发布时间：2018-07-04 23:43

本文选题：天津 + 冬季　；参考：《中国环境科学》2017年04期

【摘要】：基于污染物浓度、颗粒物化学组分及气象参数等观测数据,综合分析天津市2015年冬季典型重污染过程成因及污染特征,结果表明:天津市冬季重污染期间风速0~4.0m/s,相对湿度80%以上,混合层高度仅为清洁天气的1/3~1/2,静稳高湿的大气环境对重污染影响较大.重污染过程NO_2/SO_2比值较清洁天气低,NO_3~-/SO_4~(2-)比值大于1,表明重污染期间天津市移动源与固定源并重.重污染PM_(2.5)/PM_(10)比值较清洁天气高,PM_1/PM_(2.5)比值较清洁天气低,可能与重污染过程期间细粒子的吸湿增长以及散煤燃烧排放有关.污染初期NOR大于SOR,随着重污染持续,u6于受制于氨,SOR要高于NOR,需关注气态前体物尤其是SO_2排放.OC与EC浓度高时二者相关性较低,SOC占OC的20%~54%,说明冬季重污染期间散煤燃烧源和二次有机化学反应对冬季重污染影响较大.
[Abstract]:Based on the observation data of pollutant concentration, particulate chemical composition and meteorological parameters, the causes and characteristics of typical heavy pollution process in 2015 winter in Tianjin were analyzed. The results show that during winter heavy pollution in Tianjin, the wind speed is 0 ~ 4.0 m / s, the relative humidity is more than 80%, the height of mixing layer is only 1 / 3 / 1 / 2 of that of clean weather, and the atmospheric environment with static stability and high humidity has a great influence on heavy pollution. The ratio of no _ 2 / so _ 2 in heavy pollution process is lower than that in clean weather. The ratio of no _ 2 / so _ 4 ~ (2-) is higher than 1, which indicates that the moving source and the fixed source in Tianjin are equal to each other during the heavy pollution period. The ratio of PM2.5 / PM10 in heavy pollution is higher than that in clean weather, and the ratio of PM2.5 / PM2.5 is lower than that in clean weather, which may be related to the increase of moisture absorption of fine particles and the emission from coal combustion during heavy pollution. In the initial stage of pollution, nor is greater than sor, and with the heavy pollution sustained by ammonia sor, it is higher than NOR. it is necessary to pay attention to gaseous precursors, especially when the concentration of SO2 and EC is high, and the correlation between them is lower than that of OC, indicating that the bulk coal is dispersed in winter during heavy pollution period, especially when the concentration of SO2 and EC is high. Combustion source and secondary organic chemical reaction have great influence on heavy pollution in winter.
【作者单位】：天津市环境监测中心;南开大学;天津市气象科学研究所;
【基金】：国家重点研发计划(2016YFC0208500) 国家科技支撑计划(2014BAC23B00) 天津市重大科技专项(工程)项目(14ZCDGSF00027) 天津市科技计划项目(15YFYSSF00030)
【分类号】：X51

【参考文献】