Study on the concentration of air negative oxygen ion and its influencing factors in different seasons of Minjiang River Estuary Wetland
The concentration of air negative oxygen ions has become one of the important indicators of air quality,and has gradually attracted widespread attention.Based on the field positioning automatic monitoring system of air quality monitoring station and automatic weather station in Minjiang River Estuary Wetland National Nature Reserve,this study studied the changes of air negative oxygen ion concentration and its influencing factors in different seasons from June 2022 to May 2023.The results showed that the average concentration of negative oxygen ions in the air of the Minjiang River Estuary wetland was 10741±3717 ion/cm3.The difference between summer and winter was not significant,and the difference among other seasons was significant.The concentrations of air negative oxygen ions in different seasons were spring>summer>winter>autumn.The diurnal variation of air negative oxygen ion concentration in different seasons presents a"single peak and single valley"shape,show-ing a trend higher at night and lower during the day.The highest value appeared in the morning or at night and the lowest value appeared in the daytime.The concentration of air negative oxygen ion in differ-ent seasons was significantly affected by atmospheric particulate matter and environmental factors,and has a significant negative correlation with temperature and 2-minute wind speed,but there was no significant correlation between temperature and concentraton in winter,2-minute wind speed and concentraton in sum-mer.The concentration of air negative oxygen ions was significantly negatively influenced by PM2.5and PM10.
air negative oxygen ionseasonsenvironmental factorsMinjiang River Estuary Wetland