基于AMF-HXA的长株潭空气质量指数互相关性分析

Cross-Correlation Analysis of Air Quality Index in Changsha, Zhuzhou and Xiangtan Based on AMH-HXA

摘要: 随着我国经济的飞速发展，近年来我国的空气污染问题越来越严重。工业污染物和生活供暖产生的细微颗粒物成为了空气污染的两大源泉。如何揭露不同城市间空气质量指数(Air Quality Index, AQI)与传统空气污染因子如工业污染物NO₂和细微颗粒物如PM2.5的关系，成为了我们必须考虑的关键问题。本文利用流行的仿多重分形高度互相关分析研究了长株潭每个城市的上述三个指标的无标度性、AQI与两种污染指标的波动差异性及两两城市间的PM2.5浓度与NO₂浓度的互相关及其显著性、每个城市AQI与这两种污染指标在春夏秋冬四个季节里的互相关及其显著性。结果表明每个城市的AQI与PM2.5的波动情况基本吻合，而AQI与NO₂的波动具有较大差异；四个季节里长株潭两两城市间PM2.5都具有极显著的互相关性，而NO₂在不同季节里互相关性不同。这些结论为探寻长株潭影响空气质量的相互影响提供了一个新视角。

Abstract: As the economy soars, air pollution sweeps across the China in recent years. Industrial waste gas and life stove and heating are two main sources of the air pollution. How to uncover the relationship between the air quality index (AQI) and traditional air pollution factors, such as industrial pollutants, NO₂ and fine particles, such as PM2.5 for different cities has become a key point we care about. In this paper, we apply the popular analogous multifractal height cross-correlation analysis (AMF-HXA) into investigating the air quality in neighboring Changsha city, Zhuzhou city and Xiangtan city in Central China, which includes that the scale free of AQI, PM2.5 concentration and NO₂ concentration, the fluctuation difference between the AQI and PM2.5 as well as NO₂, respectively, the cross-correlation of the two pollution factors in each two cities, and the cross-correlations together with the significance between the AQI and above two pollution factors in each cities. The main conclusions are: 1) the fluctuation of AQI is consistent with that of PM2.5 concentration but disagreed with that of NO₂ in different seasons; 2) there is high cross-correlation significance of PM2.5 between each two cities in all of seasons but the significance of the cross-correlation of NO₂ is different in different seasons. These conclusions can provide a new insight to unveil the variation tendency of air pollution between different cities.