2015年“十一”期间北京市大气重污染过程分析
发布时间：2018-07-25 14:57
【摘要】：采用垂直观测、地面观测、PM_(2.5)化学组分观测和气团轨迹分析等手段,对2015年10月份北京市一次大气重污染过程进行了分析.结果表明,重污染时近地面层气溶胶消光系数升高,污染物主要积聚在600m以下.重污染期间气象要素特征为:风场弱,湿度大,地面受弱气压场控制,边界层高度极低.重污染期间不同站点PM_(2.5)浓度变化趋势和峰值出现时间较为一致;大部分时段PM_(2.5)中NO_3~-浓度明显高于其他组分;周边区域受重污染的影响面积相对较小,高浓度区主要集中在北京市及近周边地区.多手段的观测结果以及PM_(2.5)浓度与气象要素和各化学组分的相关性分析的结果均表明:区域传输,包括秸秆焚烧,对本次北京市重污染天气过程具有一定的影响,但本地机动车排放在不利气象条件下的积累、二次转化以及垂直方向空间的极端压缩是导致重污染的主要原因.
[Abstract]:A heavy air pollution process in Beijing in October 2015 was analyzed by means of vertical observation, surface observation of PM2.5 chemical component observation and air mass trajectory analysis. The results show that the extinction coefficient of aerosol near the ground layer increases during heavy pollution, and the pollutant mainly accumulates below 600m. The characteristics of meteorological elements during heavy pollution are as follows: weak wind field, high humidity, low boundary layer height and weak air pressure field on the ground. During the period of heavy pollution, the variation trend and peak time of PM2.5 concentration at different stations were consistent, the NO3- concentration in PM2.5 was obviously higher than that of other components, and the area affected by heavy pollution was relatively small in the surrounding area. High concentration areas are mainly concentrated in Beijing and the surrounding areas. The results of multi-means observation and the correlation analysis of PM2.5 concentration with meteorological elements and chemical components show that regional transport, including straw burning, has a certain effect on the heavy polluted weather process in Beijing. However, the accumulation of local motor vehicle emissions under adverse weather conditions, secondary transformation and extreme compression of vertical space are the main causes of heavy pollution.
【作者单位】： 北京市环境保护监测中心;大气颗粒物监测技术北京市重点实验室;
【基金】：环保公益性行业科研专项(201409005) 国家科技支撑计划课题(2014BAC23B03)
【分类号】：X51
，
本文编号：2144175
[Abstract]:A heavy air pollution process in Beijing in October 2015 was analyzed by means of vertical observation, surface observation of PM2.5 chemical component observation and air mass trajectory analysis. The results show that the extinction coefficient of aerosol near the ground layer increases during heavy pollution, and the pollutant mainly accumulates below 600m. The characteristics of meteorological elements during heavy pollution are as follows: weak wind field, high humidity, low boundary layer height and weak air pressure field on the ground. During the period of heavy pollution, the variation trend and peak time of PM2.5 concentration at different stations were consistent, the NO3- concentration in PM2.5 was obviously higher than that of other components, and the area affected by heavy pollution was relatively small in the surrounding area. High concentration areas are mainly concentrated in Beijing and the surrounding areas. The results of multi-means observation and the correlation analysis of PM2.5 concentration with meteorological elements and chemical components show that regional transport, including straw burning, has a certain effect on the heavy polluted weather process in Beijing. However, the accumulation of local motor vehicle emissions under adverse weather conditions, secondary transformation and extreme compression of vertical space are the main causes of heavy pollution.
【作者单位】： 北京市环境保护监测中心;大气颗粒物监测技术北京市重点实验室;
【基金】：环保公益性行业科研专项(201409005) 国家科技支撑计划课题(2014BAC23B03)
【分类号】：X51
，
本文编号：2144175
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