南京北郊大气臭氧变体特征及其影响因素研究

发布时间：2018-06-11 11:34

本文选题：工业区 + O3　；参考：《南京信息工程大学》2015年硕士论文

【摘要】：03在全球和区域大气环境变化中起着至关重要的作用,它不仅对大气辐射系统有重要影响,而且对城市大气造成明显的环境效应。本文以南京江北外场观测资料为基础,对大气中03及其前体物浓度和气象要素的变化关系进行了分析研究；深入分析了03等污染气体的相互影响,对天气因素对大气污染物浓度影响做了分析。主要研究内容如下：1)南京北郊夏季O3、NOx、CO和VOCs等的平均体积分数分别为(32.0±15.2)x10-9、(21.5±14.0)×10-9、(0.6±0.4)×10-6和(33.1±25.2)×10-9；按新的国家二级标准,观测期间03超标14.1%;有11d霾天,占整个观测期间的11.1%。2)南京四个站点的03浓度概率分布曲线较为相似,反映出南京大气03污染区域混合性较好。而NO和CO的概率分布曲线存在区域差异。03浓度日变化呈现单峰型分布,日最高值出现在午后14时左右,而日最低值一般出现在早上7时左右。3)周边源排放对03前体物体积分数影响较大。在偏东风主导下NOx、CO和VOCs体积分数易出现高值；在西南风控制下,大气中一些光化学活性较高的组分,如烯烃的等量丙烯体积分数较高,03体积分数也容易累积到高值。当地VOCs/NOx(体积分数之比)的值在2.0左右有利于03的生成,VOCs/NOx值过高时可能反而不利于03的生成。4)南京北郊臭氧产生效率(OPE)为2.17士0.12；OPE值随NOx体积浓度变化规律近似于一阶负指数形式。5) NUIST站点03浓度是在VOCs和NOx共同控制下产生。03产生过程中,烯烃和芳香烃的贡献最大。NO由于滴定作用对03产生起到负作用。
[Abstract]:03 plays an important role in the global and regional atmospheric environment changes, which not only has an important influence on the atmospheric radiation system, but also has an obvious environmental effect on the urban atmosphere. Based on the observation data of the outfield in the north of Nanjing, this paper analyses the relationship between the concentration of 03 and its precursors and the meteorological elements in the atmosphere. The interaction of 03 polluted gases and the influence of weather factors on the concentration of air pollutants are analyzed. The main contents are as follows: 1) the average volume fraction of O3, NOx, CO and VOCs in Nanjing Beijiao in summer is (32 + 15.2) x10-9, (21.5 + 14) x 10-9, (0.6 + 0.4) * 10-6 and (33.1 + 25.2) * 10-9; according to the new country The two level standard, during the observation period 03 exceeded the standard 14.1%; with 11d haze days, accounting for the whole observation period of 11.1%.2), the 03 concentration probability distribution curve of Nanjing four sites is similar, reflecting the 03 polluted region of the atmosphere is better mixed, while the probability distribution curve of NO and CO has regional difference.03 concentration diurnal variation showing a single peak distribution, the daily maximum value is out. Now around 14 hours in the afternoon, and the daily minimum value usually appears at about.3 in the morning at about 7 hours.) the emission of peripheral sources has a greater impact on the volume fraction of 03 precursors. Under the dominance of the easterly wind, the volume fraction of CO and VOCs is easy to appear. Under the control of the southwest wind, some of the higher photochemical activity in the atmosphere, such as the volume fraction of the alkene, is compared. High, 03 volume fraction is also easy to accumulate to high value. The value of local VOCs/NOx (volume fraction ratio) is around 2 in favor of 03 generation, and when the VOCs/NOx value is too high, it may not be beneficial to the formation of 03.4). The ozone production efficiency (OPE) in Nanjing is 2.17 st 0.12, and the OPE value with NOx volume concentration is similar to the first order negative exponential.5 NUIST. The 03 concentration of site 03 is produced under the co control of VOCs and NOx, and the maximum contribution of olefin and aromatic hydrocarbons is.NO due to the negative effect of titration on 03.
【学位授予单位】：南京信息工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X51

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