本文選題：天津 + 冬季��； 參考：《中國環(huán)境科學》2017年04期

【摘要】：基于污染物濃度、顆粒物化學組分及氣象參數(shù)等觀測數(shù)據(jù),綜合分析天津市2015年冬季典型重污染過程成因及污染特征,結(jié)果表明:天津市冬季重污染期間風速0~4.0m/s,相對濕度80%以上,混合層高度僅為清潔天氣的1/3~1/2,靜穩(wěn)高濕的大氣環(huán)境對重污染影響較大.重污染過程NO_2/SO_2比值較清潔天氣低,NO_3~-/SO_4~(2-)比值大于1,表明重污染期間天津市移動源與固定源并重.重污染PM_(2.5)/PM_(10)比值較清潔天氣高,PM_1/PM_(2.5)比值較清潔天氣低,可能與重污染過程期間細粒子的吸濕增長以及散煤燃燒排放有關(guān).污染初期NOR大于SOR,隨著重污染持續(xù),u6于受制于氨,SOR要高于NOR,需關(guān)注氣態(tài)前體物尤其是SO_2排放.OC與EC濃度高時二者相關(guān)性較低,SOC占OC的20%~54%,說明冬季重污染期間散煤燃燒源和二次有機化學反應對冬季重污染影響較大.
[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.
【作者單位】： 天津市環(huán)境監(jiān)測中心;南開大學;天津市氣象科學研究所;
【基金】：國家重點研發(fā)計劃(2016YFC0208500) 國家科技支撐計劃(2014BAC23B00) 天津市重大科技專項(工程)項目(14ZCDGSF00027) 天津市科技計劃項目(15YFYSSF00030)
【分類號】：X51

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