1981~2018年成都平原经济区霾日变化分析

基于1981~2018年成都平原经济区44个气象站点霾日观测资料，分析了该地区霾日的时空演变特征，并利用城市群霾日综合评估模型范式对区域空气质量进行了量化分析。结果表明:（1）成都平原经济区高霾日多集中在德阳、成都和乐山等城市地区，冬季霾日最多，春秋季次之，夏季最少；（2）1991~2000年为成都平原经济区霾日数的高发阶段，2011~2018年霾日数呈明显下降趋势；（3）EOF（Empirical Orthogonal Function）和小波分析均揭示出成都平原经济区霾日数呈明显下降的趋势，其中资阳、成都、遂宁下降最快，仅绵阳北部呈小幅上升趋势。 

Variation Analysis of Haze Day Trends of Chengdu Plain Economic Area from 1981 to 2018

Based on the observation data of haze days at 44 meteorological stations in Chengdu Plain Economic Zone from 1981 to 2018, the temporal and spatial evolution characteristics of haze days in the region were analyzed, and the regional air quality was quantitatively analyzed by using the comprehensive evaluation model paradigm of urban agglomeration haze days. The results show that : (1) The high haze days in Chengdu Plain Economic Zone were mostly concentrated in Deyang, Chengdu and Leshan and other urban areas. The haze days were the most in winter, followed by spring and autumn, and the least in summer. (2) The high incidence stage of haze days in Chengdu Plain Economic Zone was from 1991 to 2000, and it showed a significant downward trend from 2011 to 2018. (3) Empirical Orthogonal Function (EOF) and wavelet analysis showed that the number of haze days in Chengdu Plain Economic Zone showed a significant downward trend, and the fastest decline occurred in Ziyang, Chengdu and Suining, and a slight upward trend only occurred in northern Mianyang.