【摘要】 利用西安浐灞生态区空气负氧离子监测数据,分析西安夏季负氧离子浓度变化特征,研究降雨对负氧离子浓度变化的影响以及气象环境因素对负氧离子浓度的预报预测。研究显示:西安夏季浐灞生态区负氧离子月均值8月最高,无雨日负氧离子最大值常出现在深夜至凌晨时段;雨日负氧离子小时浓度与前0～3 h各时次的降雨呈直线相关关系（p<0.05）;中雨以上的降雨与负氧离子浓度的线性关系较小雨更显著,表明降雨能激增空气负氧离子浓度;空气负氧离子浓度与PM_2.5、PM₁₀、CO、日降水量、日均风速有显著相关性（p<0.01）。通过逐步回归分析法,建立夏季负氧离子浓度的多元逐步回归预报模型（p<0.01）,拟合曲线与实际观测曲线基本一致。更多还原

【Abstract】 Using the monitoring data of negative oxygen ions in air in Xi’an Chanba Ecological Zone, this paper analyzed the variation characteristics of negative oxygen ion concentration in Xi’an in summer and studied the effect of rainfall on the change of negative oxygen ion concentration and the prediction of the meteorological environmental factors on concentration of negative oxygen ions. The results show that the highest average monthly mean of negative oxygen ions in Xi’an Chanba Ecological Zone appears in August, and the maximum value in days without raining shows up from late night to morning hours. The hourly concentration of negative oxygen ions in raining days directly relates to the rainfall in the previous 0 to 3 hours（p<0.05）. The linear relationship between medium and heavy rainfall and negative oxygen ion concentration is less obvious than that between small rain and negative oxygen ion concentration, and the medium and heavy rain can abruptly increase the negative oxygen ion concentration. The negative oxygen ion concentration has obvious correlation with PM_2.5,PM₁₀, CO, daily precipitation, and daily average wind speed（p<0.01）. By means of step-wise regression analysis, the multiple step-wise regression prediction model of negative oxygen ion concentration in summer was established（p<0.01）. The fitting is basically consistent with the actual observation curve.更多还原