摘要
2009年在北京师范大学科技园内对PM2s质量浓度的连续监测结果表明,PM22.5质量浓度的年均值为55.2μg·m^-3日均值在1.2-325.9μg·m^-3之间变化,且频数分布呈现出明显的倾斜:大量的质量浓度值位于30-70μg·m^3之间;季节变化特征为冬季PM2.5污染水平明显高于其他季节;不同季节的日变化模式存在显著差异:整体上是冬季夜间质量浓度高于白天,夏季白天质量浓度高于夜晚,同时在各个季节下午16:00以后质量浓度都存在回升现象.
PM2.5 concentration was monitored continuously at The Science and Technology Park at Beijing Normal University in 2009. It was found that annual average PM2.5 concentration was 55.2μg·m^-3. The 24 h average concentrations ranged from 1.2 to 325.9 μg·m^-3 and frequency distributions for PM2.5 concentrations was highly skewed, with most of the values lying in the range from 30 to 70μg·m^-3. Pronounced seasonal variability was observed. PM2.5 concentration in winter was higher than in other seasons. Diurnal variation also changed with season: in winter, PM2.5 concentration at night was higher than in the day, but in summer this was reversed. In all seasons a concentration rebound after 4 PM was all observed.
出处
《北京师范大学学报(自然科学版)》
CAS
CSCD
北大核心
2011年第3期258-261,共4页
Journal of Beijing Normal University(Natural Science)
基金
北京市科委公益院所改革与发展资助项目
关键词
PM2.5质量浓度
月变化
逐时变化
频数分布
PM2.5 concentration,monthly variation,diurnal variation, frequency distributions