洛阳市冬季大风天气下PM_(10)和PM_(2.5)浓度变化研究

Research on the Concentration Changes of PM_(2.5) and PM_(10) in Winter Windy Weather in Luoyang

利用洛阳市环境空气质量自动监测国控站点的监测数据,分析了冬季大风天气下PM10、PM2.5浓度变化情况。结果表明,从大风来临到结束,PM10和PM2.5质量浓度整体呈现先下降后升高的趋势;PM2.5与PM10的比值在风中阶段较低,大风前、后时段较高,特别是风中到风后过渡阶段,二者比值达到峰值,此时容易发生倒挂现象;大风来临初始阶段,风速增大导致PM10浓度出现峰值,而对PM2.5无明显影响;PM2.5对大气能见度影响较大,且当其浓度<0.5 mg/m3时,能见度属良好等级。

The monitored data provided by state-controlled sites were used to analyze the change rules of PM2. 5and PM10 in the different stages of windy weather. The results showed that from the start to the end of the wind,there was a trend that the concentrations of PM2. 5and PM10 increased after the first decline. Besides,the ratio of PM2. 5and PM10 was lower in the wind,and higher in the start and end of the wind. During the transition of the duration and ending,it reached peak. At the initial stage of the wind,the concentration of PM10 had an obvious ascension,but PM2. 5had no change. At the same time,the results also showed that PM2. 5had a greater impact on atmospheric visibility and when its concentration was less than 0. 5 mg / m^3,the visibility was in a good rank.