Analysis of ozone concentration variations and their relationships with meteorological factors in the Beijing-Tianjin-Hebei region from 2013 to 2020
Using the daily maximum 8-hour moving average values of near-surface ozone concentration data from 2013 to 2020 in the Beijing-Tianjin-Hebei region and concurrent atmospheric reanalysis data,this study employs Empirical Orthogonal Functions(EOF)and Singular Value Decomposition(SVD)techniques to analyze the vari-ations in near-surface ozone concentrations,the typical spatial distribution of ozone modal concentrations,and their relationships with major meteorological factors.The results indicate that the near-surface ozone concentration in the Beijing-Tianjin-Hebei region overall shows an increasing trend,with significant increases noted from 2017 to 2019,exhibiting a spatial distribution pattern of higher concentrations in the south and lower in the north.The first mode of the EOF reveals consistent spatial variability in near-surface ozone concentrations across the region,with the most significant changes observed in the areas around the junctions of Baoding,Shijiazhuang,Hengshui,and Cang-zhou.The daily maximum 8-hour moving average values of ozone concentration are positively correlated with the temperature at 15:00 and the meridional wind speed,and negatively correlated with the relative humidity at the same time,with these correlations being most significant in the southern part of the Beijing-Tianjin-Hebei region.
Pollution dayEmpirical Orthogonal Function(EOF)Singular Value Decomposition(SVD)
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