Analysis of meteorological effects on the trend of ozone in the Pearl River Delta using the KZ filtering method
Based on the ozone(O3)monitoring data and reanalysis meteorological data in the Pearl River Delta(PRD)from 2015 to 2021,the Kolmogorov-Zurbenko(KZ)filter and stepwise multiple linear regression method were used to analyze the relationship between the long-term trend of O3 and meteorological factors.This study quantified the contribution of meteorological and non-meteorological factors to the long-term trend of the maximum daily 8-hour average O3 concentration(MDA8O3)in the PRD.The results indicated a significant increase in MDA8O3 in the PRD from 2015 to 2021,with particularly severe O3 pollution in the summer and autumn.The KZ fitering method separated MDA8O3 into three components:short-term,seasonal and long-term,accounting for 60.84％,24.96％and 4.33％of the variance of the original sequence,respectively.These components were found to be independent of each other.The three components of MDA8O3 are positively correlated with solar radiation,temperature and boundary layer height,and negatively correlated with cloud cover,relative humidity,wind speed and 850hPa meridional wind.Furthermore,meteorological and non-meteorological influences were found to explain approximately 64.3％(2.77μg/(m3a))and 35.7％(1.53μg/(m3a))of the long-term trend's growth rate(4.29μg/(m3a))of MDA8O3,respectively.
万方数据
维普
