巴彦浩特NO_(X)变化特征及其对夜间O_(3)的影响

Variation Characteristics of NOX Concentrations and its Impact on O_(3)concentration at Night in Bayanhot,Inner Mongolia

采用巴彦浩特2018—2021年空气质量浓度以及气象数据探究O_(3)与NO_(X)污染特征以及相关性。结果表明,2018—2021年环保局新楼站点O_(3)质量浓度最高,西花园和蒙二幼站点相对较低,NO_(X)质量浓度则呈相反的趋势。环保局新楼站点昼夜O_(3)质量浓度差异比其他站点要小,夜间O_(3)质量浓度相对更高。NO浓度日变化整体呈单峰型分布特征,峰值从西到东依次出现,NO_(2)质量浓度日变化呈双峰型分布特征,第一个峰值出现在上午9时,第二个峰值从东到西依次出现,且环保局新楼站点的NO、NO_(2)浓度峰值均明显小于蒙二幼和西花园站点。三个站点的O_(3)与风速和气温呈显著的正相关,与湿度呈显著的负相关,且气温的变化对O_(3)质量浓度的变化影响最大。蒙二幼站点的NO_(2)、NO质量浓度与O_(3)的负相关性更强,对O_(3)影响最大,环保局新楼站点的相对较弱,对O_(3)的影响最小。三个国控站点的NO_(X)质量浓度与O_(3)夜间下降幅度均呈正相关关系,低质量浓度的NO_(X)是导致巴彦浩特地区夜间O_(3)质量浓度偏高的重要原因之一。

The characteristics and correlations of ozone and nitrogen O_(X)ide pollution were explored using the air quality concentration and meteorological data of Bayanhot from 2018 to 2021.The results showed that the ozone quality concentration at the new building site of the environmental protection bureau was the highest,while the West garden and the Mongolian second kindergarten station were relatively low,and the NO_(X)quality concentration showed the opposite trend from 2018 to 2021.The difference in ozone quality concentration between daytime and nighttime at the new building site of the environmental protection bureau was smaller than other sites.The daily variation of NO quality concentration was a single peak distribution,with the peak appearing from west to east,and the daily variation of NO_(2)quality concentration was a double peak distribution,with the first peak appearing at 9:00 am,and the second peak appearing from east to west,the peak quality concentrations of NO and NO_(2)in the new building of the Environmental Protection Bureau was significantly smaller than that in the Mongolian second kindergarten and the West Garden Station.The O_(3)of the three stations has a significant positive correlation with wind speed and temperature,and a significant negative correlation with humidity,and the change of temperature had the greatest impact on the change of ozone quality concentration.The negative correlation between NO_(2),NO and O_(3)was stronger at the Mongolian second kindergarten station,which had the greatest impact on ozone,while the new building station of the environmental protection bureau were relatively weak,which had the least impact on ozone.There is a positive correlation between the NO_(X)quality concentration and the decrease of ozone at night in the three national control stations.Low quality concentration of NO_(X)is one of the important reasons for the high quality concentration of ozone at night in Bayanhot area.