基于比值法的源解析技术研究

发布时间：2018-02-13 20:19

本文关键词： 源解析受体模型 PMF-比值有效性　出处：《南开大学》2015年硕士论文　论文类型：学位论文

【摘要】：在大气颗粒物源解析工作中,因子分析类模型得以广泛应用。然而其仅依据数学意义提取因子,获得的因子信息并不一定符合真实源类特征,物理意义不明确。为了解决上述问题,本论文提出将表征源类的特征参数—比值,耦合到因子分析类模型中,建立了基于比值法的源解析技术。本论文对这种方法的耦合机制和有效性进行了研究,并进行了实际城市空气颗粒物和多环芳烃的应用研究。本论文利用ME2模型,通过研究其运算机制及参数,利用其拉伸功能,将化学组分的比值耦合到正定矩阵因子分解算法中,构建了PMF-比值源解析技术。通过模拟实验,研究了PMF-比值源解析技术的有效性,并与PMF模型的解析结果进行了比较,结果表明：(1)相比PMF模型,PMF-比值源解析技术解析的结果更接近真实源类特征,物理意义更明确,从而验证了此方法的有效性。(2)随着对受体干扰的增强,两种模型的解析结果逐渐偏离真值,但PMF-比值源解析技术的耐受性更强。(3)该方法可以使源类的物理意义更明确,本研究尝试利用此方法解析共线源类,结果表明在一定程度上,得到较理想的结果。本论文利用构建的方法对天津市空气颗粒物受体样品和西部某城市颗粒物载带多环芳烃受体样品进行了应用研究,获得了物理意义更明确的结果,验证了PMF-比值源解析技术的有效性和适用性。
[Abstract]:Factor analysis model has been widely used in the source analysis of atmospheric particulate matter. However, the factor information obtained does not necessarily accord with the real source class characteristics, but the factor information is extracted only according to the mathematical meaning. In order to solve the above problems, this paper proposes that the characteristic parameter-ratio representing the source class be coupled to the factor analysis model. In this paper, the coupling mechanism and effectiveness of this method are studied, and the application of urban air particulates and polycyclic aromatic hydrocarbons (PAHs) is studied. The ME2 model is used in this paper. By studying its operation mechanism and parameters, using its stretching function, the ratio of chemical components is coupled to the positive definite matrix factorization algorithm, and the analytical technique of PMF- ratio source is constructed. The validity of PMF- ratio source analysis technique is studied and compared with that of PMF model. The results show that compared with PMF model, the analytical results of PMF- ratio source are closer to the characteristics of real source class, and the physical meaning is more clear. Therefore, the validity of the method is verified. (2) with the increase of the interference to the receptor, the analytical results of the two models deviate from the true value gradually, but the PMF- ratio source analysis technique is more tolerant. 3) this method can make the physical meaning of the source class more clear. In this study, we try to use this method to analyze collinear source classes, and the results show that, to some extent, In this paper, the air particulate receptor samples in Tianjin and the polycyclic aromatic hydrocarbons receptor samples in a western city were studied by using the method of construction, and the results of physical significance were more definite. The validity and applicability of PMF-ratio source analysis technique are verified.
【学位授予单位】：南开大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X513

【相似文献】