摘要
本文采用AIRMETRICS智能空气采样器对重庆市北碚区大气PM2.5和PM10进行了6个月(2015年6-11月)的连续观测。根据观测结果,并结合气象数据,分析了降水对重庆市大气颗粒物的影响。研究结果表明,观测期间重庆市大气颗粒物PM2.5和PM10质量浓度日均值分别为36.7、59.9μg·m^(-3),两者浓度变化范围较大,但变化态势相同。从时间分布来看,空气污染最严重的状况出现在夏季,不利的气象因素和污染物的积累是造成大气颗粒物污染严重的主要因素。PM2.5和PM10的质量浓度显著相关,且相关性高达0.95;PM2.5质量浓度对PM10质量浓度的贡献较大。对重庆市夏季降水进行采样分析,结果表明,PM2.5和PM10质量浓度与降水呈显著负相关,主要是降水对大气悬浮颗粒物有较好的清洁作用。此外,降水对阴离子SO_4^(2-)、NO_3^-也有去除的作用。
Based on the observational data of atmospheric aerosol from June to November 2015 at Beibei District,Chongqing City,the distribution and concentration of the atmospheric particles,especially PM2.5 and PM10 were analyzed by using AIRMETRICS intelligent air sampler,in order to reveal the relationships between the effects of precipitation on atmospheric particulate pollution.The results indicated that the daily mean values of PM2.5 and PM10 mass concentrations were 36.7 and 59.9 μg·m^(-3),respectively,and the characteristics of their variations were different,while their variation tendency was nearly the same,during the observation period in Chongqing.The atmospheric particulate pollution was most serious in summer season,due to the adverse weather conditions and the accumulation of pollutants.The concentrations of PM2.5 and PM10 were significantly correlated.Correlation analysis showed that the correlation coefficient of mass concentration of PM2.5 and PM10 was 0.95,and that PM2.5 contributed significantly to PM10.Sample analysis showed that continuous precipitation had obviously negative correlations with the PM2.5 and PM10 concentrations mainly through clearing the particular particles in summer of Chongqing.In addition,precipitation can also have the effect of removing anion of SO_4^(2-)and NO_3^-.
出处
《三峡生态环境监测》
2016年第1期46-51,共6页
Ecology and Environmental Monitoring of Three Gorges
基金
国家自然科学基金项目(41103068)
2014年度重庆市国土房管科技计划项目(CQGT-KJ-2014056)
中央高校基本科研业务费专项(XDJK2014A016)
重庆市教委研究生教改项目(yjg122019)
关键词
重庆
PM10
PM2.5
质量浓度
降水
阴离子
Chongqing
PM10
PM2.5
mass concentration
precipitation conditions
anion
