2015年“十一”期間北京市大氣重污染過程分析
發(fā)布時(shí)間：2018-07-25 14:57
【摘要】：采用垂直觀測(cè)、地面觀測(cè)、PM_(2.5)化學(xué)組分觀測(cè)和氣團(tuán)軌跡分析等手段,對(duì)2015年10月份北京市一次大氣重污染過程進(jìn)行了分析.結(jié)果表明,重污染時(shí)近地面層氣溶膠消光系數(shù)升高,污染物主要積聚在600m以下.重污染期間氣象要素特征為:風(fēng)場(chǎng)弱,濕度大,地面受弱氣壓場(chǎng)控制,邊界層高度極低.重污染期間不同站點(diǎn)PM_(2.5)濃度變化趨勢(shì)和峰值出現(xiàn)時(shí)間較為一致;大部分時(shí)段PM_(2.5)中NO_3~-濃度明顯高于其他組分;周邊區(qū)域受重污染的影響面積相對(duì)較小,高濃度區(qū)主要集中在北京市及近周邊地區(qū).多手段的觀測(cè)結(jié)果以及PM_(2.5)濃度與氣象要素和各化學(xué)組分的相關(guān)性分析的結(jié)果均表明:區(qū)域傳輸,包括秸稈焚燒,對(duì)本次北京市重污染天氣過程具有一定的影響,但本地機(jī)動(dòng)車排放在不利氣象條件下的積累、二次轉(zhuǎn)化以及垂直方向空間的極端壓縮是導(dǎo)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.
【作者單位】： 北京市環(huán)境保護(hù)監(jiān)測(cè)中心;大氣顆粒物監(jiān)測(cè)技術(shù)北京市重點(diǎn)實(shí)驗(yàn)室;
【基金】：環(huán)保公益性行業(yè)科研專項(xiàng)(201409005) 國(guó)家科技支撐計(jì)劃課題(2014BAC23B03)
【分類號(hào)】：X51
，
本文編號(hào)：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.
【作者單位】： 北京市環(huán)境保護(hù)監(jiān)測(cè)中心;大氣顆粒物監(jiān)測(cè)技術(shù)北京市重點(diǎn)實(shí)驗(yàn)室;
【基金】：環(huán)保公益性行業(yè)科研專項(xiàng)(201409005) 國(guó)家科技支撐計(jì)劃課題(2014BAC23B03)
【分類號(hào)】：X51
，
本文編號(hào)：2144175
本文鏈接：http://sikaile.net/kejilunwen/huanjinggongchenglunwen/2144175.html
最近更新
教材專著
